CN201387404Y - A mold for testing mechanical properties of small samples under multi-physics coupling field - Google Patents

Abstract

The utility model relates to a mold for testing the mechanical properties of small samples under a multi-physics coupling field, which belongs to the field of material performance evaluation. The utility model comprises a load-passing ball (1), an upper guide die (2), a pressure rod (3), a lower guide die (4), an upper load-bearing die (5) and a lower load-bearing die (6), and the dynamic material mechanical properties The testing machine, high-temperature furnace and AC-DC integrated high-voltage power supply are used together, which can realize the tough and brittle small samples (thickness 0.3-0.7mm, wafer, etc.) Diameter, square piece side length 8-10mm) mechanical properties (strength, elastic modulus, ductile-brittle transition temperature, fracture toughness, fatigue and creep, etc.) test. The utility model can solve the problem of damage and inconvenient taking and placing of the load-bearing mold in the high-temperature test through the split design of the upper and lower load-bearing molds. Both sides of the upper load-bearing mold are slotted for the effective connection of small samples and the two poles of the high-voltage power supply. .

Description

A mold for testing mechanical properties of small samples under multi-physics coupling field

technical field

The utility model relates to a mold for testing the mechanical properties of small samples under a multi-physics coupling field, which belongs to the field of material performance evaluation.

Background technique

With the advent of the information age, the miniaturization and diaphragmization of functional materials and devices has become one of the important trends in the development of material applications, and the traditional mechanical performance testing technology can no longer meet the development needs of miniaturized functional materials and devices. At the same time, in order to adapt to the application environment of multi-field coupling of functional materials and devices, there is an urgent need for a testing technology that can evaluate the mechanical properties of small samples under force, heat, electricity and their coupling conditions, and the design of the mold is to achieve multi-field coupling The key factors in the evaluation of the mechanical properties of materials under certain conditions.

At present, the molds for testing the mechanical properties of small samples are generally composed of load-bearing balls, guide molds, load-bearing molds and pressure rods. Based on the small punch (Small punch) test method and used in conjunction with the material mechanical properties testing machine (static), it can be completed There are many related reports on the test of the mechanical properties of materials under the force field; on the basis of the above test conditions of the force field, it can be used in conjunction with a high-temperature furnace to complete the test requirements of the mechanical properties of materials under the force-thermal coupling field, but the load-bearing capacity of the integrated structure Die design is prone to mold damage caused by thermal expansion during high temperature testing. At the same time, samples are not easy to take and place. There are relatively few reports on the mechanical properties of small samples under the condition of force-thermal coupling. Based on the above force field test conditions, and The high-voltage power supply is used together. Tohoku University in Japan has completed the test of the fracture performance of small samples under the electromechanical coupling field, but there are no reports on other performance tests under the electromechanical coupling field; and there is no test on the mechanical properties of small samples in the electromechanical coupling field. reports. Since functional materials are generally in a relatively complex working environment, and their multi-field coupling characteristics such as force, heat, and electricity are often used in engineering applications, corresponding testing equipment and supporting molds are urgently needed.

Contents of the invention

The purpose of this utility model is to propose a mold for testing the mechanical properties of small samples under a multi-physics coupling field. In order to achieve the above-mentioned purpose, the following design is carried out:

The mold of the utility model comprises six parts of a transmission ball (1), an upper guide die (2), a pressure bar (3), a lower guide die (4), an upper load die (5) and a lower load die (6). Features are:

The upper guide die (2) is a cylindrical structure, the size of the upper section of the cylinder is larger than the size of the lower section; the middle part of the upper end surface has a hemispherical groove, and the size of the groove is equivalent to the size of the transfer ball (1); the size of the lower section of the cylinder is the same as that of the lower guide The upper groove of the mold (4) has the same size; the lower end of the upper guide mold (2) contains a cylindrical inner hole closed above;

The cylinder is preferably a cylinder or a square cylinder.

The pressure rod (3) is a slender cylindrical rod, the upper end surface is a hemispherical head, and the lower end in contact with the small sample (7) is a flat head, and the diameter of the pressure rod (3) is smaller than the diameter of the lower cylindrical through hole of the lower guide die (4); Press bar (3) cooperates with upper guide die (2) and lower guide die (4) to transmit load.

The lower guide die (4) is a columnar structure, and the size of the upper cylinder is larger than the size of the lower one; the middle part of the upper end face has a cylindrical groove to fix the upper guide die (2); the lower cylinder is square, and the upper bearing die (5) The upper groove has the same size and is placed in the upper carrier mold (5); the lower guide mold (4) has a cylindrical through hole whose upper end communicates with the groove, and the central axis of the through hole coincides with the central axis of the lower guide mold (4) ;

The upper cylinder and the cylindrical groove are preferably cylinders or square cylinders.

The upper bearing mold (5) is a columnar structure with a square groove on the upper end surface to fix the lower guide mold (4); there is a groove in the lower column body, which communicates with the square groove on the upper end surface, and the groove is connected to the lower bearing mold (6) The size is equivalent, and it is placed on the lower carrier mold (6); the upper carrier mold (5) has notches on both sides of the lower part;

The columnar shape is preferably cylindrical or square columnar.

The lower bearing mold (6) is a columnar structure, and the inside of the column contains a through hole, the central axis of the through hole coincides with the central axis of the lower bearing mold (6), and the size of the through hole is larger than that of the pressure bar (3); the lower part of the lower bearing mold (6) It has a columnar groove, and the upper end of the groove communicates with the through hole, which is convenient for testing the deformation of the lower surface of the small sample (7).

The columnar shape is preferably cylindrical or square columnar.

Small samples (7) include discs and squares, and the thickness can be selected in various sizes, preferably 0.3-0.7 mm in thickness, preferably 8-10 mm in diameter and side length of the square.

The beneficial effects of the utility model mold device:

1. Change the design of the load-bearing mold of the integrated structure to a split structure of the upper and lower parts, specifically including the upper load-bearing mold (5) and the lower load-bearing mold (6), which can solve the problem of integration caused by thermal expansion in high-temperature tests The problem of the damage of the load-bearing mold and the inconvenience of taking and placing the small sample (7) is used to realize the mechanical performance test of the small sample (7) under the condition of force-thermal coupling.

2. Slots are made on both sides of the upper carrier mold (5). This design is convenient for the circuit connection between the two poles of the high-voltage power supply (10) and the upper and lower surfaces of the small piezoelectric ceramic sample (7), and at the same time provides insulation treatment for the outside of the connecting line A space is reserved to realize the mechanical performance test of the piezoelectric ceramic small sample (7) in the electromechanical coupling field.

3. The mold of the utility model is used in conjunction with the dynamic material mechanical performance testing machine (8), the high-temperature furnace (9) and the AC-DC integrated high-voltage power supply (10), which can realize the small sample (7) in force, heat, electricity and Testing of mechanical properties under coupled conditions.

4. The contact end of the pressure rod (3) and the small sample (7) is flat, which reduces the stress concentration during the loading process. The mold of the utility model can meet the requirements of various tough and brittle small samples (7) such as metal, ceramics, and composite materials. mechanical performance test.

5. The mold of the utility model can be used for testing mechanical properties such as strength, elastic modulus, brittle-ductile transition temperature, fracture toughness, fatigue and creep of small samples (7).

Therefore, the mold of the utility model is suitable for testing various mechanical properties of various small samples (7) under multi-physics coupling conditions, so as to meet the evaluation requirements of mechanical properties of materials in multi-field coupling engineering applications.

Description of drawings

Fig. 1 upper guide mold (2) structural diagram.

Fig. 2 lower guide mold (4) structural diagram.

Fig. 3 upper bearing mold (5) (upper and lower positive placement) structural diagram.

Fig. 4 is a structural diagram of the upper carrier mold (5) (placed up and down reversely).

Fig. 5 lower carrier mold (6) structural diagram.

Figure 6 is the overall design structure diagram of the mold; 1 is the transfer ball, 2 is the upper guide mold, 3 is the pressure bar, 4 is the lower guide mold, 5 is the upper bearing mold 6, the lower bearing mold and 7 is the sample.

Fig. 7 is a schematic diagram of cooperating the mold with the material testing machine (8) to test the mechanical properties of the material.

Fig. 8 Load-displacement curve of a small Al ₂ O ₃ ceramic sample (7) under force field conditions.

Detailed ways

Referring to Figures 6 and 7 to assemble the mould, the lower carrier mold (6) is fixed on the material mechanical performance testing machine (8), the upper carrier mold (5) is set on the lower carrier mold (6), and the Al ₂ O ₃ ceramic small sample (7 ) pass through the square groove at the upper end of the upper die (5) with the polished side facing down, and place it on the upper surface of the lower die (6), and make the center of the square hole of the upper die (5) and the center of the small sample (7) and the center of the lower die The center of the through hole of the mold (6) is on a straight line, the lower square column of the lower guide mold (4) is inserted into the groove on the upper end of the upper bearing mold (5), and the flat end of the pressure rod (3) passes through the lower guide mold (4) The cylindrical through hole is pressed on the small sample (7), the upper guide die (2) is inserted into the lower guide die (4), and the hemispherical head end of the pressing rod (3) is pressed against the circle at the lower part of the upper guide die (2). In the hole, the carrying ball (1) is placed in the hemisphere of the upper guide mold (2).

On this basis, the vertical downward pressure provided by the material mechanical performance testing machine (8) is uniform at a rate of 0.05mm/min Applied on the Al ₂ O ₃ ceramic small sample (7), the load of the small sample (7) and the small sample (7 ) relationship between the center displacement of the lower surface, as shown in Figure 8, with the help of relevant mathematical formulas or simulation calculations, the strength and other mechanical properties of the small sample (7) can be obtained.

Claims (5)

1, a kind of many physical coupling small sample Mechanics Performance Testing after the match mould, comprise pass to carry a ball (1), on lead mould (2), depression bar (3), down lead mould (4), on carry mould (5) and carry mould (6) down, it is characterized in that:

Last guiding mould (2) is a column structure, and cylinder epimere size is greater than the hypomere size; Its middle part, upper surface has a hemispherical groove, and groove size is suitable with biography year ball (1) size; Cylinder hypomere size is with guiding mould (4) upper grooves size is suitable down; Last guiding mould (2) lower end contains the cylindrical bore of top sealing;

Depression bar (3) is an elongate cylindrical shape bar, and the upper surface is a hemispherical head, and the lower end is a tack, depression bar (3) diameter less than under mould (4) the lower cylindrical shape through-hole diameter that leads;

Under the mould (4) that leads be a column structure, the epimere cylinder sizes is greater than the hypomere size; Its middle part, upper surface has cylindrical groove, the fixing guiding mould (2) of going up; The hypomere cylinder is square, and is suitable with last carrying mould (5) upper grooves size, is placed in the carrying mould (5); Leading down has the cylindric through hole that a upper end is communicated with groove in the mould (4), and the through hole axis overlaps with guiding mould (4) axis down;

Last carrying mould (5) is a column structure, and the upper surface has a square groove, fixing guiding mould (4) down; A groove is arranged in the hypomere cylinder, communicate with the upper surface square groove, groove is placed on down on the carrying mould (6) with carrying mould (6) size is suitable down; Last carrying mould (5) both sides, bottom have notch;

Under to carry mould (6) be a column structure, column-shaped internal section contains through hole, the through hole axis overlaps with carrying mould (6) axis down, clear size of opening is greater than depression bar (3) size; Under carry mould (6) bottom and have cylindrical recesses, the groove upper end communicates with through hole.

By the described a kind of many physical coupling of claim 1 small sample Mechanics Performance Testing after the match mould, it is characterized in that 2, the described column structure of going up the guiding mould is right cylinder or square cylinder.

By the described a kind of many physical coupling of claim 1 small sample Mechanics Performance Testing after the match mould, it is characterized in that 3, described the epimere cylinder and the cylindrical groove of guiding mould down are right cylinder or square cylinder.

By the described a kind of many physical coupling of claim 1 small sample Mechanics Performance Testing after the match mould, it is characterized in that 4, the described column structure of going up the carrying mould is right cylinder or square cylinder.

By the described a kind of many physical coupling of claim 1 small sample Mechanics Performance Testing after the match mould, it is characterized in that 5, the described column structure of carrying mould down is right cylinder or square cylinder.

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