JP2018124206A - Specimen holder, tensile test device, and uniaxial tensile test method - Google Patents

Abstract

Provided is a specimen holder that can be suitably applied to a uniaxial tensile test method capable of evaluating strength of a specimen made of a brittle material quickly and accurately, a tensile test apparatus having the specimen holder, and the uniaxial tensile test method. To do. A specimen holder 1A includes a first fixing surface 11 for fixing one end of a specimen 5 with a solidified substance 36 and a first connecting part 110 that is connected directly or indirectly to a tensile test device 6. A first holding tool 1, a second fixing surface portion 22 for fixing the other end portion of the test body 5 with the solidified material 36, and a second connecting portion 220 for connecting directly or indirectly to the tensile testing device 6. 2 holder 2. In the uniaxial tensile test method, one end of the test body 5 is fixed to the first holder 1 and the other end is fixed to the second holder 2 with the solidified material 36, respectively, and the first holder 1 and the second holder 2 are pulled. The test device 6 is connected directly or indirectly, and a uniaxial tensile load is applied to the test body 5 via the first holder 1 and the second holder 2. [Selection] Figure 3

Description

  The present invention relates to a specimen holder, a tensile test apparatus, and a uniaxial tensile test method.

  Conventionally, as a strength evaluation test method for brittle materials such as ceramics, bending tests such as three-point bending and four-point bending are generally used. In addition, a uniaxial tensile test is also known although it has hardly been performed except in special cases such as a high temperature creep test and a high temperature superplasticity test. In a uniaxial tensile test of a brittle material, a holder that holds and holds a test piece by mechanical stress is used (see Non-Patent Document 1).

Edited by Toshihiko Nishida and Junichi Yasuda, “Evaluation of Mechanical Properties of Ceramics”, Nikkan Kogyo Shimbun, August 29, 1986, p. 25-30

  However, the prior art has problems in the following points. For example, when a bending test is performed on a thin plate-like brittle material having a thickness of 0.2 mm or less, a small test piece having a length of about 10 mm is used as a distance between supporting points of 8 mm in order to prevent the deflection at the time of loading. It will be necessary to test with: Therefore, the inspection area in a single bending test is limited to a minute volume. Therefore, for example, in order to evaluate the strength of a thin plate-like object to be measured made of a brittle material having a size of about 4 inches square, 100 or more small test pieces are cut out from the object to be measured, and a special bending test jig is used. Bend test, which takes time. Moreover, since the intensity of the object to be measured is estimated by statistical processing from the intensity distribution of a large number of small test pieces, a large error is always added.

  On the other hand, the tensile strength is an important characteristic value when a brittle material is used as a structural material, and is extremely useful data for the design of structural parts. However, in a conventional uniaxial tensile test of a brittle material, the test piece is held by a holder and the test piece is held by mechanical stress. For this reason, stress concentration often occurs in the holding portion of the test piece and breaks at that portion, and the test is difficult. In order to reduce the stress concentration, a holder is also considered in which the end of the test piece is expanded to form a shoulder and the shoulder is hooked and held on a pin or ring. However, since it takes time and cost to process a brittle material into such a complicated shape, a test method using this type of holder has not been adopted as a general test method.

  The present invention has been made in view of the above background, and can be suitably used for a uniaxial tensile test method capable of evaluating the strength of a test body made of a brittle material more quickly and accurately than in the past. It is an object of the present invention to provide a holder, a tensile test apparatus having the holder, and the uniaxial tensile test method.

One aspect of the present invention is a specimen holder for holding the specimen when performing a uniaxial tensile test of a specimen composed of a brittle material using a tensile test apparatus,
A first holding device including a first fixing surface portion for fixing one end portion of the test body with a solidified substance, and a first connecting portion to be directly or indirectly connected to the tensile test device;
A second holding tool comprising: a second fixing surface portion for fixing the other end portion of the test body with the solidified material; and a second connecting portion that is connected directly or indirectly to the tensile test device;
It is in the specimen holder.

  Another aspect of the present invention is a tensile test apparatus having the above-described specimen holder.

Still another aspect of the present invention is to fix one end of a test body made of a brittle material to the first holder with a solidified substance,
Fixing the other end of the test body to the second holder with the solidified substance,
The first holding tool and the second holding tool holding the test body are directly or indirectly connected to a tensile test device, respectively.
A uniaxial tensile load is applied to the test body via the first holder and the second holder.
It is in the uniaxial tensile test method.

  In the uniaxial tensile test method, the test body made of a brittle material is not mechanically clamped, and the test body is fixed to the first holder and the second holder by the solidified substance. Therefore, the test body is held by the first holding tool and the second holding tool without causing stress concentration in the fixing part of the test body, and the destruction from the fixing part hardly occurs. In the uniaxial tensile test method, a uniaxial tensile load is applied to the test body via the first holder and the second holder. Therefore, according to the uniaxial tensile test method, it is possible to perform a uniaxial tensile test while holding the specimen without causing stress concentration in the specimen.

  Further, in the uniaxial tensile test method, it is not necessary to cut a large number of small test pieces from a measurement target made of a brittle material as in a bending test, and the measurement target itself is used as a test body by a uniaxial tensile test. A direct strength assessment can be performed. Therefore, according to the above uniaxial tensile test method, it is possible to shorten the time taken for the test and reduce the cost. In addition, since it is not necessary to estimate the intensity of the object to be measured by statistical processing from the intensity distribution of a large number of small test pieces, there is little error and it is possible to perform highly reliable intensity evaluation. Therefore, according to the uniaxial tensile test method, it is possible to evaluate the strength of a test body made of a brittle material more quickly and accurately than in the past.

  Moreover, according to the said test body holder, the one end part of the test body comprised from a brittle material can be fixed to the 1st fixing surface part of a 1st holder with a solidification substance. Moreover, the other end part of a test body can be fixed to the 2nd fixing surface part of a 2nd holder with a solidification substance. Moreover, it can be directly or indirectly connected to the tensile testing device by the first connecting portion of the first holding tool. Moreover, it can be connected directly or indirectly to the tensile testing device by the second connecting portion of the second holder. Therefore, the said test body holder can be used suitably for the said uniaxial tension test method.

  The tensile test apparatus has the test specimen holder. Therefore, the tensile test apparatus can evaluate the strength of a test body made of a brittle material quickly and accurately by the uniaxial tensile test method using the test body holder.

It is typical explanatory drawing for demonstrating the test body holder of Example 1, a tension test apparatus, and a uniaxial tension test method. FIG. 3 is a schematic explanatory diagram for explaining the test specimen holder of Example 1. It is the III-III sectional view taken on the line in FIG. It is the IV-IV sectional view taken on the line in FIG. It is typical explanatory drawing for demonstrating the test body holder of Example 2, a tension test apparatus, and a uniaxial tension test method. It is explanatory drawing which shows a part of test body holder of Example 3, (a) and (b), (c) and (d) are 1 for comprising a 1st holder and a 2nd holder It is a dimension figure of a plate-shaped body of a set.

  First, the uniaxial tensile test method will be described. In the uniaxial tensile test method, examples of the brittle material constituting the test body include ceramics and glass.

  In the uniaxial tensile test method, after fixing one end of the test body to the first holder, the other end of the test body may be fixed to the second holder, or the other end of the test body may be fixed to the second holder. After fixing to the holder, one end of the test body may be fixed to the first holder. Moreover, you may perform simultaneously fixation of the one end part of the test body to a 1st holder, and fixation of the other end part of the test body to a 2nd holder. In addition, when fixing the test body to the first holder and the second holder, for example, using a support jig that can position the first holder and the second holder at a predetermined position, the positioned first The test body can be fixed to the holder and the second holder.

  In the uniaxial tensile test method, the test body is plate-shaped, and at least one plate surface of the front and back surfaces at one end and the other end of the test body may be fixed to the first holder and the second holder with a solidified substance. preferable. In the bending test, as the thickness of the plate-shaped specimen is reduced, the area that can be inspected in a single test becomes smaller, so that quick and accurate strength evaluation becomes difficult. According to the said structure, even if it is a plate-shaped test body, the effect of the said uniaxial tension test method can fully be exhibited, and quick and exact intensity | strength evaluation can be implement | achieved. Moreover, according to the said structure, since the area of the board surface fixed to a 1st holder and a 2nd holder is easy enough, it becomes easy to fully hold | maintain a test body with a solidified substance.

  In the uniaxial tensile test method, the solidified substance is a substance capable of integrating the first holder, the second holder, and the test body by solidification. Specifically, the solidified substance becomes liquid or paste when the specimen is fixed to the first holder or the second holder, and gets wet with the first holder, the second holder portion, and the specimen. It is possible to solidify by elapse of time or by external stimuli such as ultraviolet rays and temperature after wetting, and the first holding tool and the second holding tool are integrated with the specimen. It is a possible substance. The solidified material also includes a material that temporarily becomes liquid or pasty by raising the temperature, even if it is not liquid or pasty at room temperature or the like.

  More specifically, examples of the solidified material include an adhesive, a brazing material, a resin, and an inorganic cement. According to these solidified substances, the test body can be sufficiently fixed to the first holder and the second holder. Any adhesive can be used as long as it has adhesiveness to the specimen, the first holder, and the second holder. Examples of the adhesive include a cyanoacrylate adhesive and an epoxy adhesive. Further, any brazing material (including wax and the like) can be used as long as it has a property of melting when it is heated and solidifying when cooled. Examples of the brazing material include esters of higher fatty acids and mono- or divalent higher alcohols (such as beeswax and paraffin wax), metal brazing materials, and the like. Moreover, as resin, the epoxy resin etc. which are used for resin embedding etc. are mentioned, for example. Moreover, as an inorganic cement, an alumina cement etc. are mentioned, for example. Note that the solidified material used for fixing the first holding tool and the test body and the solidified material used for fixing the second holding tool and the test body may be the same or different. Also good. In the former case, there is an advantage that the workability of fixing the specimen to the first holder and the second holder is improved.

  In the uniaxial tensile test method, the first holder is connected to the tensile test apparatus via the first flexible wire, and the second holder is connected to the tensile test apparatus via the second flexible wire. can do. According to this configuration, the central axis of the tensile load can be aligned with the first flexible wire and the second flexible wire relatively easily, so that a bending moment that causes a large measurement error is generated. It becomes easy to suppress. Therefore, according to the said structure, it becomes possible to apply a uniform tensile stress to substantially the whole area | region of a test body, and to perform a uniaxial tensile test, and can improve the reliability of the measured tensile strength.

  Next, the test specimen holder will be described. In the test body holder, the first flexible wire to be connected to the tensile test device is attached to the first connecting portion, and the second flexible wire to be connected to the tensile test device is attached to the second connecting portion. It can be set as the structure attached. According to this configuration, the first holder and the second holder can be indirectly connected to the tensile test apparatus via the first flexible wire and the second flexible wire, respectively. Therefore, according to this configuration, as described above, it is possible to perform a uniaxial tensile test by applying a uniform tensile stress to almost the entire region of the specimen, and to improve the reliability of the measured tensile strength. it can.

  In this case, as for the said test body holder, specifically, the 1st connection part and the 2nd connection part each have a pin member, and the one end part of a 1st flexible wire is in a 1st connection part. It can be set as the structure attached so that rotation around the pin member is possible, and the one end part of the 2nd flexible wire rod is rotatably attached around the pin member in the 2nd connection part. According to this configuration, even when the linear direction of the first flexible wire and the linear direction of the second flexible wire are attached with a slight shift, the test specimen is held as soon as a load is applied. The first flexible wire and the one end of the second flexible wire rotate around each pin member around the pin member. Then, since the linear direction of the first flexible wire and the linear direction of the second flexible wire are aligned, the center axis of the load is automatically aligned and no bending moment is generated on the specimen. . Therefore, according to this configuration, it is possible to perform a uniaxial tensile test by applying a uniform tensile stress to almost the entire region of the specimen, and the reliability of the measured tensile strength can be further improved.

  In the test body holder, each of the first holder and the second holder includes a plurality of first fixing surface portions and second fixing surface portions that fix a plurality of portions on the side surface of the end portion of the test body. be able to.

  According to this structure, the one end part and other end part of a test body can be each fixed to a some 1st fixing surface part and 2nd fixing surface part. Therefore, according to this configuration, the test body can be sufficiently fixed to the first holder and the second holder.

  In the test body holder, the test body has a plate shape, and a plurality of first fixing surface portions and second fixing surface portions are provided so as to face at least both the front and back plate surfaces of the one end portion and the other end portion of the test body. It can be set as the structure which has.

  According to this configuration, at least the front and back plate surfaces of the one end portion of the test body can be fixed to the plurality of first fixing surface portions by the solidified substance. Similarly, at least both front and back plate surfaces of the other end of the test body can be fixed to the plurality of second fixing surface portions by the solidified substance. Therefore, according to this configuration, the test body can be sufficiently fixed to the first holder and the second holder.

  In the uniaxial tensile test method and the specimen holder described above, the first holder is specifically a crosshead portion (or base portion) of a tensile test apparatus described later, and the second holder is a tensile test. They can be connected directly or indirectly to the base (or crosshead) of the device, respectively. Specific examples of the first flexible wire and the second flexible wire include wires such as steel wires. In addition, the first holder and the second holder can be connected to the tensile test apparatus via a member having an axis adjustment mechanism of a load shaft such as a universal joint.

  Next, the tensile test apparatus will be described. The tensile testing apparatus is a testing machine capable of performing at least a tensile test. The tensile test apparatus may be capable of performing not only a tensile test but also other tests.

  Specifically, the tensile test apparatus includes a cross head part and a base part. The tensile test apparatus includes a crosshead portion (or a base portion), the first holder in the test body holder, and a base portion (or crosshead portion) in the second holder of the test body holder. Can be configured to be connectable directly or indirectly. In addition, the said tensile test apparatus is provided with the member which has the axis | shaft adjustment mechanism of load shafts, such as a universal joint (universal joint), It is also possible to comprise the said test body holder through the said member so that connection is possible.

  In addition, each structure mentioned above can be arbitrarily combined as needed, in order to acquire each effect etc. which were mentioned above.

  Hereinafter, the specimen holder, the tensile test apparatus, and the uniaxial tensile test method of the examples will be described with reference to the drawings.

Example 1
A specimen holder, a tensile test apparatus, and a uniaxial tensile test method of Example 1 will be described with reference to FIGS. First, the test specimen holder of this example will be described.

  As shown in FIG. 1, the specimen holder 1A of this example holds the specimen 5 when performing a uniaxial tensile test of the specimen 5 made of a brittle material using a tensile testing device 6 described later. It is used to do. As shown in FIGS. 2 to 4, the specimen holder 1 </ b> A includes a first holder 1 and a second holder 2.

  The first holding tool 1 has a first fixing surface portion 11 for fixing one end portion of the test body 5 with the solidified substance 36 and a first connecting portion 110 for connecting directly or indirectly to the tensile test apparatus 6. Yes. The second holder 2 has a second fixing surface portion 22 for fixing the other end portion of the test body 5 with the solidified substance 36 and a second connecting portion 220 for connecting directly or indirectly to the tensile test apparatus 6. ing. In this example, the specimen holder 1A is for holding a plate-like specimen 5 made of a brittle material.

  The first holder 1 has two metal plate-like bodies 30 stacked. The two plate-like bodies 30 have a first through hole 31 penetrating in the plate thickness direction substantially at the center of the plate surface. A bolt 310 is inserted into the first through hole 31, and a nut 311 is screwed into the bolt 310 inserted into the first through hole 31. The two plate-like bodies 30 are integrated by fastening with bolts 310 and nuts 311.

  In this example, a first fixing surface portion 11 for fixing one end portion of the test body 5 with the solidified substance 36 is formed around the boundary between the two plate-like bodies 30 at the other end portion of the first holding tool 1. . The first fixed surface portion 11 is provided on each of the two plate-like bodies 30 in the other end portion of the first holder 1. Specifically, the first fixed surface portion 11 is configured such that, at the other end portion of the first holder 1, the thicknesses of the two plate-like bodies 30 are thinner than the main body portions, respectively, and the mating surface side of the two plate-like bodies 30. Are formed by providing step portions 33 respectively. The two first fixed surface portions 11 are provided so as to face each other. One end of the test body 5 is disposed in a gap formed between the two first fixed surface portions 11. That is, one first fixed surface portion 11 faces one plate surface at one end portion of the plate-like test body 5. The other first fixed surface portion 11 faces the other plate surface at one end of the plate-like test body 5. Then, one plate surface at one end of the plate-like test body 5 is fixed to one first fixing surface portion 11 by the solidified material 36. The other plate surface at one end of the plate-like test body 5 is fixed to the other first fixing surface portion 11 by the solidified material 36. In addition, the clearance gap formed between the two 1st fixed surface parts 11 can be made into the magnitude | size which added about 100-200 micrometers to the thickness of the test body 5, for example.

  A groove 34 is provided in contact with each of the two first fixed surface portions 11. The groove 34 is a portion where the surplus solidified material 36 (such as an adhesive or brazing material) escapes when the specimen 5 is fixed to the first fixed surface portion 11 by the solidified material 36.

  In this example, the 1st holder 1 has the 1st connection part 110 specifically connected with the tensile test apparatus 6 indirectly. The two plate-like bodies 30 have a second through hole 32 between one end face of the first holder 1 and the first through hole 31. The second through hole 32 passes through the two plate-like bodies 30 perpendicularly to the load direction of the uniaxial load. The pin member 320 is inserted into the second through hole 32. A space 35 is formed from one end surface of the first holding tool 1 between the second through hole 32 and the first through hole 31. A part of the pin member 320 inserted into the second through hole 32 is exposed in the space 35. In this example, one end portion of the first flexible wire 41 inserted into the space portion 35 from one end surface of the first holder 1 is attached to the pin member 320 exposed in the space portion 35. Specifically, one end of the first flexible wire 41 is attached to be rotatable around the pin member 320. More specifically, the first flexible wire 41 can be rotated around the pin member 320 by inserting the pin member 320 into a ring formed at one end of the first flexible wire 41. It is said. In this example, the other end portion of the first flexible wire 41 is connected to a cross head portion 61 of the tensile test apparatus 6 described later.

  The second holder 2 is basically formed in the same shape as the first holder 1. The second holder 2 has two metal plate-like bodies 30 stacked. The two plate-like bodies 30 have a first through hole 31 penetrating in the plate thickness direction substantially at the center of the plate surface. A bolt 310 is inserted into the first through hole 31, and a nut 311 is screwed into the bolt 310 inserted into the first through hole 31. The two plate-like bodies 30 are integrated by fastening with bolts 310 and nuts 311.

  In this example, a second fixing surface portion 22 for fixing the other end portion of the test body 5 with the solidified substance 36 is formed around the boundary between the two plate-like bodies 30 at the other end portion of the second holder 2. Yes. The second fixed surface portion 22 is provided on each of the two plate-like bodies 30 at the other end of the second holder 2. Specifically, the second fixed surface portion 22 is configured such that, at the other end portion of the second holder 2, the thicknesses of the two plate-like bodies 30 are thinner than the main body portions, respectively, and the mating surface side of the two plate-like bodies 30. Are formed by providing step portions 33 respectively. The two second fixed surface portions 22 are provided so as to face each other. The other end portion of the test body 5 is disposed in a gap formed between the two second fixed surface portions 22. That is, one second fixed surface portion 22 faces one plate surface at the other end of the plate-like test body 5. The other second fixed surface portion 22 faces the other plate surface at the other end portion of the plate-like test body 5. Then, one plate surface at the other end portion of the plate-like test body 5 is fixed to one second fixing surface portion 22 by the solidified material 36. The other plate surface of the other end portion of the plate-shaped test body 5 is fixed to the other second fixing surface portion 22 by the solidified material 36. In addition, the clearance gap formed between the two 2nd fixed surface parts 22 can be made into the magnitude | size which added about 100-200 micrometers to the thickness of the test body 5, for example.

  A groove 34 is provided in contact with each of the two second fixed surface portions 22. The groove 34 is a portion where the excess solidified material 36 (such as an adhesive or brazing material) escapes when the specimen 5 is fixed to the second fixing surface portion 22 by the solidified material 36.

  In this example, the 2nd holding tool 2 has the 2nd connection part 220 indirectly connected with the tensile test apparatus 6 specifically ,. The two plate-like bodies 30 have a second through hole 32 between one end surface of the second holder 2 and the first through hole 31. The second through hole 32 passes through the two plate-like bodies 30 perpendicularly to the load direction of the uniaxial load. The pin member 320 is inserted into the second through hole 32. A space 35 is formed from one end surface of the second holder 2 to between the second through hole 32 and the first through hole 31. A part of the pin member 320 inserted into the second through hole 32 is exposed in the space 35. In this example, one end portion of the second flexible wire 42 inserted into the space portion 35 from one end surface of the second holder 2 is attached to the pin member 320 exposed in the space portion 35. Specifically, one end of the second flexible wire 42 is attached to be rotatable around the pin member 320. More specifically, the second flexible wire 42 can be rotated around the pin member 320 by inserting the pin member 320 into a ring formed at one end of the second flexible wire 42. It is said. In this example, the other end portion of the second flexible wire 42 is connected to the base portion 62 of the tensile test apparatus 6. In this example, both the first flexible wire 41 and the second flexible wire 42 are steel wires.

  Next, the tensile test apparatus of this example will be described.

  As illustrated in FIG. 1, the tensile test apparatus 6 of this example includes a test specimen holder 1 </ b> A of this example. Specifically, the tensile test apparatus 6 includes a cross head portion 61 and a base portion 62. The tensile test apparatus 6 directly or indirectly connects the first holding tool 1 in the test specimen holder 1A, the base 62, and the second holder 2 in the test specimen holder 1A to the crosshead portion 61. It is configured to be connectable. In FIG. 1, the first holder 1 is configured to be indirectly connectable to the crosshead portion 61 via the first flexible wire 41, and the second holder 2 is configured to be the second flexible wire 42. An example is shown in which it is configured to be indirectly connectable to the base portion 62 via the.

  Next, the uniaxial tensile test method of this example will be described.

  In the uniaxial tensile test method of this example, one end of the test body 5 made of a brittle material is fixed to the first holder 1 by the solidifying substance 36, and the other end of the test body 5 is secondly held by the solidifying substance 36. The first holding tool 1 and the second holding tool 2 fixed to the tool 2 and holding the test body 5 are directly or indirectly connected to the tensile test device 6, respectively. 2 This is a method of applying a uniaxial tensile load via the holder 2. Hereinafter, as an example, the case where the uniaxial tensile test method of this example is implemented using the specimen holder 1A of this example will be described.

  In the uniaxial tensile test method of this example, one end of the test body 5 made of a brittle material is fixed to the first holder 1 by the solidified substance 36. Further, the other end of the test body 5 is fixed to the second holder 2 by the solidified material 36.

  Here, an adhesive or a brazing material is used as the solidifying material 36. Hereinafter, an example using a brazing material such as beeswax or paraffin wax will be described. In this example, specifically, the solidified material 36 melted by heat is applied to the first fixing surface portions 11 of the first and second plate-like bodies 30 of the first holder 1. The solidified material 36 applied to one first fixed surface portion 11 and one plate surface at one end of the test body 5 are bonded together, and the solidified material 36 applied to the other first fixed surface portion 11 and the test body 5 The other plate surface at one end of the plate is bonded together. The solidified material 36 can be solidified by natural cooling. Similarly, the solidified material 36 melted by heat is applied to each of the second fixed surface portions 22 in the one and the other plate-like bodies 30 of the second holder 2. The solidified material 36 applied to one second fixed surface portion 22 and one plate surface at the other end of the test body 5 are bonded together, and the solidified material 36 applied to the other second fixed surface portion 22 and the test body The other plate surface at the other end of 5 is bonded together. The solidified material 36 can be solidified by natural cooling. Bolts 310 are inserted into the first through holes 31 of the first holding tool 1 and the second holding tool 2, respectively, and fixed with nuts 311.

In addition, when the magnitude | size of the plate-shaped test body 5 is 30 mm square and 100 micrometers in thickness, for example, the cross-sectional area of the test body 5 will be about 3 mm ² piece. In this case, in a ceramic material having a fracture strength of 400 MPa, the tensile load is 1.2 kN. With such a tensile load, the area of the first fixed surface portion 11 and the second fixed surface portion 22 is sufficiently secured, so that the holding by the solidified substance 36 is not performed by the mechanical stress. However, the test body 5 can be held sufficiently. In this example, the area of each of the first fixed surface portion 11 and the second fixed surface portion 22 can be set to 8 mm × 22 mm = 176 mm ² , for example.

  Next, in the uniaxial tensile test method of this example, the first holder 1 and the second holder 2 that hold the test body 5 are indirectly connected to the tensile test apparatus 6. Specifically, the pin member 320 is inserted into each of the second through holes 32 of the first holder 1 and the second holder 2. One end of the first flexible wire 41 is rotatably hooked on the pin member 320 of the first holder 1, and the other end of the first flexible wire 41 is attached to the crosshead portion 61 of the tensile test apparatus 6. Link. Further, one end of the second flexible wire 42 is rotatably hooked on the pin member 320 of the second holder 2, and the other end of the second flexible wire 42 is connected to the base portion 62 of the tensile test apparatus 6. Connect to

  Next, in the uniaxial tensile test method of this example, a uniaxial tensile load is applied to the test body 5 via the first holder 1 and the second holder 2.

  Next, the effects of the test specimen holder, the tensile test apparatus, and the uniaxial tensile test method of this example will be described.

  In the uniaxial tensile test method of this example, the test body 5 made of a brittle material is not clamped mechanically, and the test body 5 is fixed to the first holder 1 and the second holder 2 by the solidified substance 36. . Therefore, the test body 5 is held by the first holding tool 1 and the second holding tool 2 without causing stress concentration in the fixing part of the test body 5, and the destruction from the fixing part hardly occurs. In the uniaxial tensile test method of this example, a uniaxial tensile load is applied to the test body 5 via the first holder 1 and the second holder 2. Therefore, according to the uniaxial tensile test method of this example, the test body 5 can be held and the uniaxial tensile test can be performed without causing stress concentration on the test body 5.

  Further, in the uniaxial tensile test method of this example, unlike the bending test, it is not necessary to cut a large number of small test pieces from the measurement target made of a brittle material, and the measurement target itself is used as the test body 5 to be uniaxial. A direct strength evaluation can be performed by a tensile test. Therefore, according to the uniaxial tensile test method of this example, it is possible to shorten the time required for the test and reduce the cost. In addition, since it is not necessary to estimate the intensity of the object to be measured by statistical processing from the intensity distribution of a large number of small test pieces, there is little error and it is possible to perform highly reliable intensity evaluation.

  In the uniaxial tensile test method of this example, since the central axis of the tensile load can be aligned with the first flexible wire 41 and the second flexible wire 42 relatively easily, a measurement error is large. It is easy to suppress the generation of bending moments. Therefore, according to the uniaxial tensile test method of this example, it becomes possible to perform a uniaxial tensile test by applying a uniform tensile stress to almost the entire region of the test body 5 and to improve the reliability of the measured tensile strength. Can do.

  Next, according to the test body holder of this example, one end of the test body 5 made of a brittle material can be fixed to the first fixing surface portion 11 of the first holder 1 by the solidified substance 36. Further, the other end portion of the test body 5 can be fixed to the second fixing surface portion 22 of the second holder 2 by the solidifying material 36. In addition, the first connecting portion 110 of the first holder 1 can be indirectly connected to the tensile test apparatus 6. In addition, the second connecting part 220 of the second holder 2 can be indirectly connected to the tensile test apparatus 6. Therefore, the specimen holder 1A of this example can be suitably used for the uniaxial tensile test method of this example.

  Further, in the test specimen holder 1A of this example, the first flexible wire 41 and the second flexible wire 42 to be connected to the tensile test device 6 are attached to the first connecting portion 110 and the second connecting portion 220, respectively. It has been. According to the test body holder 1A of this example, the first holder 1 and the second holder 2 are connected to the tensile test apparatus 6 via the first flexible wire 41 and the second flexible wire 42, respectively. can do. Therefore, according to the specimen holder 1A of this example, it is possible to perform a uniaxial tensile test by applying a uniform tensile stress to almost the entire region of the specimen 5, and increase the reliability of the measured tensile strength. be able to.

  Moreover, in the test body holder 1A of this example, both ends of the first flexible wire 41 and the second flexible wire 42 are attached so as to be rotatable around the pin member 320. Therefore, according to the specimen holder 1A of this example, even when the linear direction of the first flexible wire 41 and the linear direction of the second flexible wire 42 are attached with a slight shift, a load is applied. If it starts, the end part of the 1st flexible wire 41 and the 2nd flexible wire 42 will rotate centering | focusing on the pin member 320 around each pin member 320, with the test body 5 hold | maintained. Then, when the linear direction of the first flexible wire 41 and the linear direction of the second flexible wire 42 are aligned, the center axis of the load is automatically aligned (automatic axis alignment mechanism). That is, the bending moment is not generated with respect to the test body 5 by rotating the test body holder 1 </ b> A holding the test body 5 around the pin member 320. Therefore, according to the specimen holder 1A of this example, it is possible to perform a uniaxial tensile test by applying a uniform tensile stress to almost the entire region of the specimen 5, and further increase the reliability of the measured tensile strength. be able to. In addition, it is not necessary to remove the test body 5 in order to align the center axis of the load, and hold the test body holder 1A and attach it to the tensile test apparatus 6 again.

  Moreover, the tensile test apparatus 6 of this example has a specimen holder 1A. Therefore, the tensile test apparatus 6 of this example can evaluate the strength of a test body made of a brittle material quickly and accurately by using the test specimen holder 1A and the uniaxial tensile test method of this example.

(Example 2)
A one-specimen holder, a tensile test apparatus, and a uniaxial tensile test method of Example 2 will be described with reference to FIG.

  The specimen holder 1B of this example is for holding a rod-like specimen 5 made of a brittle material. Examples of the rod-shaped test body 5 include shapes such as a rectangular rod shape, a cylindrical rod shape, and a cylindrical rod shape. In FIG. 5, a square bar-shaped test body 5 is shown.

  In this example, each of the first holder 1 and the second holder 2 has a resin portion 7. The resin part 7 is formed from resin, such as an epoxy resin, for example. Here, an example in which the resin portion 7 is filled in a bottomed molding cup body 71 is shown. Female screw holes (not shown) are respectively formed at one end portions of the first holder 1 and the second holder 2 so as to match the central axis of the resin portion 7. An eyebolt 72 is attached to each female screw hole. In this example, the eyebolt 72 on the first holder 1 side constitutes the first connecting part 110, and the eyebolt 72 on the second holder 2 side constitutes the second connecting part.

  In addition, one end portion of the test body 5 is embedded in the resin portion 7 at the other end portion of the first holder 1. In this example, the surface portion of the resin portion 7 that faces the side surface (not shown) of the embedded portion of the test body 5 on the first holder 1 side corresponds to the first fixed surface portion 11 and the solidified substance 36. Similarly, the other end portion of the test body 5 is embedded in the resin portion 7 at the other end portion of the second holder 2. In this example, the surface portion of the resin portion 7 that faces the side surface (not shown) of the embedded portion of the test body 5 on the second holder 2 side corresponds to the second fixed surface portion 22 and the solidified substance 36. That is, in this example, the first fixed surface portion 11 and the solidified material 36 are integrated, and the second fixed surface portion 22 and the solidified material 36 are integrated. In addition, when the test body 5 is a porous body, the resin for forming the resin body 7 can be penetrate | infiltrated and solidified using the vacuum impregnation method etc. in the hole part of the test body 5. FIG. However, in this case, it is necessary to pay attention so that the resin does not reach the evaluation portion of the test body 5.

  In this example, the first flexible wire 41 to be connected to the tensile testing device 6 is attached to the eyebolt 72 on the first holder 1 side as the first connecting portion 110. A second flexible wire 42 to be connected to the tensile testing device 6 is attached to the eyebolt 72 on the second holder 2 side as the second connecting portion 220. In addition, the tensile test apparatus 6 of this example is the same as that of Example 1 except having the test body holder 1B of this example instead of the test body holder 1A. The uniaxial tensile test method of this example is the same as that of Example 1 except that the test is performed using the test specimen holder 1B of this example instead of the specimen holder 1A.

  According to the uniaxial tensile test method of this example, as in Example 1, the strength of the test body 5 made of a brittle material can be evaluated quickly and accurately. In addition, the specimen holder 1B of this example can be suitably used in the uniaxial tensile test method of this example, as in Example 1. Moreover, the tensile test apparatus 6 of this example can evaluate the strength of a test body made of a brittle material quickly and accurately by using the test specimen holder 1B of this example and using the uniaxial tensile test method of this example. it can.

(Example 3)
The specimen holder of Example 3 will be described with reference to FIG. In FIG. 6, a set of plate-like bodies 30 for configuring the first holder 1 and the second holder 2 described in the test body holder 1A of Example 1 is shown more specifically. . In addition, the unit of the dimension of each part shown by FIG. 6 is mm. The material of the plate-like body 30 is an aluminum alloy. In addition, for example, a test body 5 of 40 mm long × 22 mm wide × 160 μm thick formed of a brittle material such as glass can be applied to the specimen holder 1A of this example. As the pin member 320 (not shown in FIG. 6), a pin member having a diameter of 5 mm and a length of 25 mm can be used. Note that A in FIG. 6B means a hole for an M3 hexagon socket head bolt, and B in FIG. 6D means a hole for an M3 nut.

  As mentioned above, although the Example of this invention was described in detail, this invention is not limited to the said Example, A various change is possible within the range which does not impair the meaning of this invention.

  For example, in the said Example, the 1st flexible wire 41 is attached to the 1st connection part 110 of the 1st holder 1, and the 2nd flexible wire 42 is attached to the 2nd connection part 220 of the 2nd holder 2, respectively. In addition, an example in which the uniaxial tensile test is performed by indirectly connecting to the tensile test apparatus 6 through these is shown. However, the first connection part 110 of the first holder 1 and the second connection part 220 of the second holder 2 are connected. It is also possible to directly connect to the crosshead portion 61 and the base portion 62 of the tensile test apparatus 6.

DESCRIPTION OF SYMBOLS 1A, 1B Test body holder 1 1st holder 11 1st fixed surface part 110 1st connection part 2 2nd holder 22 2nd fixed surface part 220 2nd connection part 36 Solidified substance 5 Test body 6 Tensile test apparatus

Claims (10)

A specimen holder for holding the specimen when performing a uniaxial tensile test of a specimen composed of a brittle material using a tensile testing device,
A first holding device including a first fixing surface portion for fixing one end portion of the test body with a solidified substance, and a first connecting portion to be directly or indirectly connected to the tensile test device;
A second holding tool comprising: a second fixing surface portion for fixing the other end portion of the test body with the solidified material; and a second connecting portion that is connected directly or indirectly to the tensile test device;
A specimen holder. A first flexible wire to be connected to the tensile test device is attached to the first connecting part,
The test body holder according to claim 1, wherein a second flexible wire to be connected to the tensile test apparatus is attached to the second connecting portion. The first connecting part and the second connecting part each have a pin member,
One end of the first flexible wire is attached so as to be rotatable around the pin member in the first connecting portion,
The test body holder according to claim 2, wherein one end portion of the second flexible wire is rotatably attached around the pin member in the second connecting portion.   The said 1st holding tool and the said 2nd holding tool are provided with the said some 1st fixing surface part and the said 2nd fixing surface part which fix the some place of the side surface in the edge part of the said test body, respectively. 4. The specimen holder according to any one of 3 above. The specimen is plate-shaped,
The said 1st fixed surface part and the said 2nd fixed surface part are each provided with two or more so that it may each oppose at least the board surface of both the front and back in the one end part and other end part of the said test body. The specimen holder according to Item.   A tensile testing apparatus comprising the specimen holder according to any one of claims 1 to 5. One end of a test body made of a brittle material is fixed to the first holder with a solidified substance,
Fixing the other end of the test body to the second holder with the solidified substance,
The first holding tool and the second holding tool holding the test body are directly or indirectly connected to a tensile test device, respectively.
A uniaxial tensile load is applied to the test body via the first holder and the second holder.
Uniaxial tensile test method. The specimen is plate-shaped,
The uniaxial tensile test method according to claim 7, wherein at least one of the front and back plate surfaces of one end and the other end of the test body is fixed to the first holder and the second holder with the solidified substance.   The uniaxial tensile test method according to claim 7 or 8, wherein the solidified material is at least one selected from the group consisting of an adhesive, a brazing material, a resin, and an inorganic cement.   The first holder is connected to the tensile test device via a first flexible wire, and the second holder is connected to the tensile test device via a second flexible wire. 10. The uniaxial tensile test method according to any one of 9 above.

Images