CN106814086B - Inner container cracking analysis method - Google Patents

Abstract

The invention provides a crack analysis method for an inner container, which mainly includes: providing several inner container samples and a stress generating device, applying stress to the inner container samples, and causing the inner container samples to crack to produce first cracks; testing to obtain the The cross-sectional characteristic patterns of different positions of the first crack; provide the liner with the second crack to be analyzed, test the cross-sectional patterns of different positions of the second crack, and compare the cross-sectional pattern with the cross-sectional characteristic pattern Right, to determine the crack initiation location of the second crack. Using this liner cracking analysis method, through the comparative analysis of the cross-sectional morphology of the liner crack, the crack initiation position and crack propagation direction of the liner can be determined, so as to facilitate the analysis and improvement of the subsequent liner molding and assembly process structure.

Description

Analysis method of liner cracking

technical field

The invention relates to the technical field of refrigeration equipment, in particular to a crack analysis method for an inner tank.

Background technique

At present, the cracking quality of the liner of refrigerators and other refrigeration equipment is an unavoidable chronic problem, which causes a lot of quality loss costs to enterprises. We know that the liner will crack under the action of stress, but the crack propagation mechanism is related to many factors. The material, structure and assembly method of the liner, as well as the microstructure changes of the material, may cause the cracks of the liner to expand in different directions. . In addition, through the analysis of a large number of refrigerators with cracked inner liners, the cracking process of the inner liner starts from a certain point where the cracking starting point appears, and then the cracks spread from the starting point to the surroundings in an instant. Therefore, judging the starting position of inner tank cracking, analyzing the structural defects of the inner tank at this position for structural improvement, and judging and analyzing the stress generation factors at this position are important ways to reduce inner tank cracking and improve product qualification rate.

In view of this, it is necessary to provide a new method for crack analysis of liner.

Contents of the invention

The purpose of the present invention is to provide a crack analysis method for the inner tank, which can determine the cracking start position and the crack propagation direction of the inner tank through comparative analysis of the cross-sectional appearance of the inner tank crack, so as to facilitate subsequent structural analysis and improvement.

In order to achieve the above-mentioned purpose of the invention, the present invention provides a kind of liner cracking analysis method, mainly comprises:

Provide some inner tank samples;

providing a stress generating device to apply stress to the liner sample and cause the liner sample to crack to generate a first crack;

Obtaining cross-sectional feature patterns at different positions of the first crack through testing;

Provide the liner with the second crack to be analyzed, test the cross-sectional pattern at different positions of the second crack, and compare the cross-sectional pattern with the characteristic pattern of the cross-section to determine the location of the second crack Crack initiation location.

As a further improvement of the present invention, a liner sample with a first crack is selected, marked at equal intervals along the extension direction of the first crack, and cross-sectional samples at each marked position are prepared and numbered, and the inner liner is obtained by observation. The pattern of the cross-section sample corresponding to the different marking positions of the first crack of the gallbladder sample;

Repeat the test to obtain the patterns of cross-sectional samples at different positions of the first cracks generated by several inner tank samples respectively; comprehensively compare and analyze the cross-sectional characteristic patterns at the starting positions of the first cracks, wherein the first A crack initiation location is the stress application location.

As a further improvement of the present invention, equidistant markings are carried out along the second cracks, the cross-section samples to be measured at each marked position are prepared and numbered, and the cross-sectional pattern of each cross-section sample to be measured is obtained by observation.

As a further improvement of the present invention, the distance between adjacent marking positions of the first crack is equal to the distance between adjacent marking positions of the second crack.

As a further improvement of the present invention, a metallographic microscope and/or a scanning electron microscope are provided to detect the pattern of the cross-sectional sample obtained from the first crack and the cross-sectional pattern of the cross-sectional sample to be tested for the second crack.

As a further improvement of the present invention, the magnifications of the pattern of the cross-section sample and the cross-section pattern of the cross-section sample to be measured are both set at 500-1000 times.

As a further improvement of the present invention, a high-speed photographic device is provided to record the crack initiation position and propagation direction of the first crack.

As a further improvement of the present invention, stress is applied to the structurally complete liner sample by the stress generating device, so that the liner sample cracks to generate the first crack.

As a further improvement of the present invention, several of the liner samples are consistent with the molding materials and processes of the liner to be analyzed.

The beneficial effect of the present invention is that: the analysis method for inner container cracking of the present invention obtains the cross-sectional characteristic patterns of different positions of the first cracks by analyzing and testing the first cracks generated by several inner container samples under the stress generating device, and then Comparing the cross-sectional patterns at different positions on the second crack of the liner to be analyzed with the cross-sectional characteristic pattern, so as to determine the cracking initiation position of the liner. In this way, it is convenient to determine the crack initiation position and the crack propagation direction of the liner, so as to facilitate the structural analysis and improvement of the subsequent liner molding and assembly process.

Description of drawings

Fig. 1 is the schematic flow sheet of liner crack analysis method of the present invention;

Fig. 2 is a cross-sectional characteristic pattern of the first crack starting position in the liner cracking analysis method of the present invention.

Detailed ways

The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings. However, this embodiment does not limit the present invention, and any structural, method, or functional changes made by those skilled in the art according to this embodiment are included in the protection scope of the present invention.

Please refer to Fig. 1 for a schematic flow chart of the liner cracking analysis method of the present invention, and the liner cracking analysis method mainly includes the following steps:

Provide some inner tank samples;

providing a stress generating device to apply stress to the liner sample and cause the liner sample to crack to generate a first crack;

Obtaining cross-sectional feature patterns at different positions of the first crack through testing;

Provide the liner with the second crack to be analyzed, test the cross-sectional pattern of different positions of the second crack, and compare the cross-sectional pattern with the characteristic pattern of the cross-section to determine the location of the second crack Crack initiation location.

The acquisition of the cross-sectional characteristic pattern specifically includes: selecting a liner sample with a first crack, marking at equal intervals along the extension direction of the first crack, making and numbering the cross-sectional samples at each marked position, and observing Obtain the pattern of the cross-sectional sample corresponding to the different marking positions of the first crack of the inner container sample;

Repeat the test to obtain the patterns of cross-sectional samples at different positions of the first cracks generated by several inner tank samples respectively;

Through comprehensive comparison and analysis, the characteristic pattern of the section is obtained, wherein the characteristic pattern of the section at the starting position of the first crack is shown in FIG. 2 .

The above-mentioned pattern of the cross-sectional sample of the first crack and the cross-sectional pattern of the cross-sectional sample of the second crack to be tested are obtained by observation with a metallographic microscope and/or a scanning electron microscope. Moreover, the magnifications of the pattern of the cross-section sample and the cross-section pattern of the cross-section sample to be measured are both set at 500-1000 times.

The acquisition of the cross-sectional pattern includes marking at equal intervals along the second crack, preparing and numbering the samples of the cross-sections to be measured at each marked position, and then observing and obtaining each cross-section to be measured by using a metallographic microscope and/or a scanning electron microscope. The cross-sectional pattern of the sample. Wherein, the distance between adjacent marked positions of the first crack is equal to the distance between adjacent marked positions of the second crack, preferably, the distance between adjacent marked positions is set to 1 cm.

Some of the liner samples are consistent with the molding material and process of the liner to be analyzed. And, each liner sample is only subjected to one stress cracking test, that is, in the first crack making step, stress is applied to the structurally complete liner sample by the stress generating device, so that the crack of the liner sample occurs the first crack.

In particular, the stress generating device is in point contact with the liner sample and exerts stress on the liner sample through the contact point, and the first crack initiation position is the stress application position.

In other embodiments of the present invention, the stress generating device applies stress to a certain linear extension region or a certain contact surface of the liner sample, thereby causing the liner sample to crack and generate the first crack. A high-speed photographic device is provided to record the crack initiation position and propagation direction of the first crack.

In summary, the liner crack analysis method of the present invention obtains cross-sectional feature patterns at different positions of the first cracks by analyzing and testing the first cracks generated by several liner samples under the stress generating device, and then Analyzing the cross-sectional patterns at different positions on the second crack of the liner and comparing with the cross-sectional characteristic pattern to determine the cracking initiation position of the liner. In this way, it is convenient to determine the crack initiation position and the crack propagation direction of the liner, so as to facilitate the structural analysis and improvement of the subsequent liner molding and assembly process.

It should be understood that although this description is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the description is only for clarity, and those skilled in the art should take the description as a whole, and each The technical solutions in the embodiments can also be properly combined to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions for feasible implementations of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalent implementation or implementation that does not depart from the technical spirit of the present invention All changes should be included within the protection scope of the present invention.

Claims (8)

1. A method for analyzing cracking of an inner container is characterized by mainly comprising the following steps:

providing a plurality of liner samples;

providing a stress generating device to apply stress to the liner sample and enable the liner sample to crack to generate a first crack;

marking at equal intervals along the extending direction of the first crack, preparing and numbering section samples at the marked positions, and observing and obtaining patterns of the section samples corresponding to different marked positions of the first crack of the liner sample;

repeating the test, and respectively obtaining the patterns of the section samples at different positions of the first cracks generated by the liner samples;

comprehensively comparing to obtain a section characteristic pattern of the first crack starting position, wherein the first crack starting position is the stress application position;

providing a liner to be analyzed with a second crack, testing to obtain section patterns of different positions of the second crack, and comparing the section patterns with the section characteristic patterns to determine the cracking starting position of the second crack.

2. The analytical method of claim 1, wherein: and marking at equal intervals along the second cracks, preparing and numbering the section samples to be detected at the marked positions, and observing to obtain the section patterns of the section samples to be detected.

3. The analytical method of claim 2, wherein: the distance between the first crack adjacent mark positions is equal to the distance between the second crack adjacent mark positions.

4. The analytical method of claim 2, wherein: and providing a metallographic microscope and/or a scanning electron microscope, and detecting and obtaining the pattern of the section sample of the first crack and the section pattern of the section sample to be detected of the second crack.

5. The analytical method of claim 4, wherein: the magnification times of the pattern of the section sample and the section pattern of the section sample to be detected are both set to be 500-1000 times.

6. The analytical method of claim 1, wherein: and providing a high-speed shooting device for recording the cracking starting position and the propagation direction of the first crack.

7. The analytical method of claim 1, wherein: and applying stress to the liner sample with a complete structure through the stress generating device so as to crack the liner sample to generate the first crack.

8. The analytical method of claim 1, wherein: the forming materials and the process of a plurality of liner samples and the liner to be analyzed are consistent.