Rigid heat insulation tile reusability test method

Abstract

The invention provides a rigid heat insulation tile reusable performance test method, which comprises the following steps: sequentially carrying out a cold and hot cycle test, a vacuum pretreatment test and a heat resistance test on a first test piece, and measuring first size information and first weight information corresponding to the first test piece; sequentially carrying out a cold and hot cycle test, a vacuum pretreatment test, a heat resistance test, a cold and hot cycle test, a vacuum pretreatment test and a heat resistance test on the second test piece, and measuring second size information and second weight information corresponding to the second test piece; when a difference value between the second size information and the first size information is within a first preset range, judging that the reusable performance of the first test piece and the second test piece meets a preset standard; and / or, when the difference between the second weight information and the first weight information is within a second preset range, determining that the reusable performance of the first test piece and the second test piece meets a preset standard.

Description

Technical Field

[0001] The present disclosure relates to the technical field of system robustness analysis, and in particular to a method for testing the reusable performance of rigid thermal insulation tiles. Background Art

[0002] Rigid thermal insulation tiles are a typical thermal protection system for aerospace vehicles. With the development of aerospace vehicles, new thermal insulation tile materials with the characteristics of high temperature resistance and light weight continue to emerge. The flight environment of aerospace vehicles is very harsh, and they are in an environment where force and heat change rapidly. This puts higher requirements on the performance of thermal insulation tile materials. In addition to basic mechanical properties and fatigue resistance, they must also have good reusability. Therefore, it is very necessary to carry out reusability performance testing of thermal insulation tiles.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] The present invention provides a method for testing the reusability performance of rigid thermal insulation tiles, which can test the reusability performance of thermal insulation tiles and provide data support for the structural design and performance optimization of thermal insulation tiles.

[0005] According to one aspect of the present disclosure, a method for testing the reusability of a rigid thermal insulation tile is provided, comprising:

[0006] Providing a first test piece and a second test piece, wherein the first test piece and the second test piece have the same structure, size and material;

[0007] performing a hot-cold cycle test, a vacuum pretreatment test, and a heat resistance test on the first test piece in sequence, and measuring first dimension information and first weight information corresponding to the first test piece;

[0008] sequentially performing a hot-cold cycle test, a vacuum pretreatment test, a heat resistance test, a hot-cold cycle test, a vacuum pretreatment test, and a heat resistance test on the second test piece, and measuring second dimension information and second weight information corresponding to the second test piece;

[0009] When the difference between the second size information and the first size information is within a first preset range, the reusability of the first test piece and the second test piece is determined to meet the preset standard; and / or, when the difference between the second weight information and the first weight information is within a second preset range, the reusability of the first test piece and the second test piece is determined to meet the preset standard.

[0010] In an exemplary embodiment of the present disclosure, the testing method further includes:

[0011] Providing a third test piece and a fourth test piece, wherein the third test piece and the fourth test piece have the same structure, size and material;

[0012] performing a cold and hot cycle test, a vacuum pretreatment test, and a tensile test on the third test piece in sequence, and measuring third dimension information and third weight information corresponding to the third test piece;

[0013] performing a hot-cold cycle test, a vacuum pretreatment test, a hot-cold cycle test, a vacuum pretreatment test, and a tensile test on the fourth test piece in sequence, and measuring fourth dimension information and fourth weight information corresponding to the fourth test piece;

[0014] When the difference between the fourth size information and the third size information is within a third preset range, the reusability of the third test piece and the fourth test piece is determined to meet the preset standard; and / or, when the difference between the third weight information and the fourth weight information is within a fourth preset range, the reusability of the third test piece and the fourth test piece is determined to meet the preset standard.

[0015] In an exemplary embodiment of the present disclosure, the thermal cycle test includes the following steps:

[0016] S1, heating the first test piece, the second test piece, the third test piece or the fourth test piece to a first preset temperature and keeping the temperature for a first preset time, wherein the first preset temperature is greater than 100° C.;

[0017] S2, lowering the temperature of the first test piece, the second test piece, the third test piece or the fourth test piece from the first preset temperature to a second preset temperature and maintaining the temperature for a second preset time, wherein the second preset temperature is less than -30°C;

[0018] Repeat steps S1-S2 for a preset number of times.

[0019] In an exemplary embodiment of the present disclosure, the first preset temperature is 120°C to 140°C; the second preset temperature is -40°C to -60°C.

[0020] In an exemplary embodiment of the present disclosure, the first preset time length and the second preset time length are both 8 minutes to 12 minutes, and the preset number of times is 110 times to 130 times.

[0021] In an exemplary embodiment of the present disclosure, the vacuum pretreatment test includes:

[0022] The first test piece, the second test piece, the third test piece or the fourth test piece is placed in a vacuum container, and the pressure of the vacuum container is set to be less than 1.3×10 -5 Pa; the duration of the vacuum pretreatment test is 1 to 2 days.

[0023] In an exemplary embodiment of the present disclosure, the heat resistance test includes:

[0024] Placing the first test piece or the second test piece on a test bracket, wherein the test bracket is connected to a heating rod;

[0025] The first test piece or the second test piece is heated to a third preset temperature by the heating rod, and is kept at the temperature for a third preset time and then cooled.

[0026] In an exemplary embodiment of the present disclosure, the third preset temperature is 500° C. to 600° C., and the third preset time is 80 seconds to 100 seconds.

[0027] In an exemplary embodiment of the present disclosure, the tensile test includes:

[0028] Adhere the upper surface and the lower surface of the third test piece or the fourth test piece to different loading blocks respectively by using adhesive, and cure at a fourth preset temperature;

[0029] Mounting the third test piece bonded with the loading block or the fourth test piece bonded with the loading block on a test fixture of a test machine;

[0030] A tensile load is applied to the third test piece or the fourth test piece at a preset loading rate until the third test piece or the fourth test piece is destroyed.

[0031] In an exemplary embodiment of the present disclosure, the fourth preset temperature is 50°C to 70°C.

[0032] The test method for the reusable performance test of the rigid thermal insulation tile disclosed in the present invention can simulate the temperature changes experienced by the thermal insulation tile in actual use through the hot and cold cycle test, and evaluate its tolerance to temperature fluctuations. The vacuum conditions of the space environment are simulated by the vacuum pretreatment test to test the stability and performance of the thermal insulation tile under this condition. The bearing capacity of the thermal insulation tile in a high temperature environment is directly tested by the heat resistance test. By measuring the dimensional information and weight information before and after the test, the changes in the physical properties of the thermal insulation tile after a series of tests can be quantitatively evaluated. In this process, the changes in the dimensional information of the test piece can reflect the stability of the thermal insulation tile structure and the deformation under high temperature and vacuum environment, providing important data support for evaluating the reliability of the thermal insulation tile. The weight change of the test piece can reveal the ablation, volatilization or moisture absorption of the thermal insulation tile material, and can provide data support for the durability evaluation of the thermal insulation tile. At the same time, the performance data of the thermal insulation tile under various extreme conditions can be obtained through the hot and cold cycle test, vacuum pretreatment test and heat resistance test, and these data provide a data basis for optimizing the structural design of the thermal insulation tile. In addition, by setting the first preset range and the second preset range, a clear evaluation standard is provided for evaluating the reusability of the thermal insulation tile. By comparing the test results of the size information and weight information of the first test piece and the second test piece, the reusability of the thermal insulation tile can be evaluated.

[0033] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0035] Figure 1 It is a flow chart of the test method for the reusability performance test of the rigid insulation tile in the embodiment of the present disclosure.

[0036] Figure 2 It is a schematic diagram of the first test piece, the second test piece and the loading block in the embodiment of the present disclosure.

[0037] Figure 3 1 is the temperature loading curve of the hot and cold cycle test in the embodiment of the present disclosure.

[0038] Figure 4 1 is a temperature loading curve of a heat resistance test in an embodiment of the present disclosure.

[0039] Figure 5 Schematic diagram of a thermocouple in an embodiment of the present disclosure.

[0040] Figure 6 Schematic diagram of a test fixture for a tensile test in an embodiment of the present disclosure.

[0041] In the figure: 1, first test piece; 2, second test piece; 3, thermocouple; 4, loading block; 5, fixing part; 51, chuck; 52, bottom plate; 53, U-shaped ear piece; 6, connecting block; 7, pin shaft. DETAILED DESCRIPTION

[0042] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0043] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the illustration to another component, these terms are used in this specification only for convenience, such as according to the orientation of the examples described in the drawings. It is understood that if the device of the illustration is turned upside down, the component described as "upper" will become the component "lower". When a structure is "on" other structures, it may mean that the structure is formed integrally on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0044] The terms "a", "an", "the" and "said" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to indicate an open-ended inclusive meaning and mean that there may be additional elements / components / etc. in addition to the listed elements / components / etc. The terms "first", "second", "third" and "fourth" are used only as labels and are not intended to limit the quantity of their objects.

[0045] The present disclosure provides a method for testing the reusability of rigid thermal insulation tiles. Figure 1 As shown, the test method may include steps S110 to S140, wherein:

[0046] Step S110, providing a first test piece and a second test piece, wherein the first test piece and the second test piece have the same structure, size and material;

[0047] Step S120, performing a hot-cold cycle test, a vacuum pretreatment test, and a heat resistance test on the first test piece in sequence, and measuring first size information and second weight information corresponding to the first test piece;

[0048] Step S130, performing a hot-cold cycle test, a vacuum pretreatment test, a heat resistance test, a hot-cold cycle test, a vacuum pretreatment test, and a heat resistance test on the second test piece in sequence, and measuring second size information and second weight information corresponding to the second test piece;

[0049] Step S140, when the difference between the second size information and the first size information is within a first preset range, it is determined that the reusability of the first test piece and the second test piece meets the preset standard; and / or, when the difference between the second weight information and the first weight information is within a second preset range, it is determined that the reusability of the first test piece and the second test piece meets the preset standard.

[0050] The test method for the reusable performance test of the rigid thermal insulation tile disclosed in the present invention can simulate the temperature changes experienced by the thermal insulation tile in actual use through the hot and cold cycle test, and evaluate its tolerance to temperature fluctuations. The vacuum conditions of the space environment are simulated by the vacuum pretreatment test to test the stability and performance of the thermal insulation tile under this condition. The bearing capacity of the thermal insulation tile in a high temperature environment is directly tested by the heat resistance test. By measuring the dimensional information and weight information before and after the test, the changes in the physical properties of the thermal insulation tile after a series of tests can be quantitatively evaluated. In this process, the changes in the dimensional information of the test piece can reflect the stability of the thermal insulation tile structure and the deformation under high temperature and vacuum environment, providing important data support for evaluating the reliability of the thermal insulation tile. The weight change of the test piece can reveal the ablation, volatilization or moisture absorption of the thermal insulation tile material, and can provide data support for the durability evaluation of the thermal insulation tile. At the same time, the performance data of the thermal insulation tile under various extreme conditions can be obtained through the hot and cold cycle test, vacuum pretreatment test and heat resistance test, and these data provide a data basis for optimizing the structural design of the thermal insulation tile. In addition, by setting the first preset range and the second preset range, a clear evaluation standard is provided for evaluating the reusability of the thermal insulation tile. By comparing the test results of the size information and weight information of the first test piece and the second test piece, the reusability of the thermal insulation tile can be evaluated.

[0051] The following is a detailed description of the various steps and specific details of the test method for the reusability of the rigid thermal insulation tile disclosed in the present invention:

[0052] like Figure 1 As shown, in step S110, a first test piece and a second test piece are provided, and the first test piece and the second test piece have the same structure, size and material.

[0053] The first test piece 1 and the second test piece 2 can be two thermal insulation tile test pieces with the same structure, material and size. Figure 2As shown, the first test piece 1 and the second test piece 2 may both be block-shaped, and the first test piece 1 and the second test piece 2 may have a first surface and a second surface that are arranged opposite to each other, and the first surface and the second surface may both be planes, and the first surface and the second surface may be arranged in parallel. For example, the first test piece 1 and the second test piece 2 may both be rectangular parallelepiped, and the first surface and the second surface may be the upper surface and the lower surface of the rectangular parallelepiped first test piece 1 or the second test piece 2, respectively. The first test piece 1 and the second test piece 2 may both be hollow structures, that is, the first test piece 1 and the second test piece 2 may both have an outer surface and an inner surface.

[0054] like Figure 1 As shown, in step S120, the first test piece 1 is subjected to a cold-hot cycle test, a vacuum pretreatment test and a heat resistance test in sequence, and the first size information and the second weight information corresponding to the first test piece 1 are measured.

[0055] Before conducting various tests, the first test piece 1 can be photographed and weighed, and the weight information of the first test piece 1 before the test can be recorded; the length and width of the first surface of the first test piece 1, the length and width of the second surface of the first test piece 1 can also be measured and recorded, and at the same time, the length and width of the middle part of the length direction of the first test piece 1 can also be measured and recorded.

[0056] The first test piece 1 may be subjected to a hot and cold cycle test first. After the hot and cold cycle test, the first test piece 1 may be photographed, its dimensions may be measured, and its weight may be weighed, and the photographs, dimension information, and weight information may be recorded. Subsequently, the first test piece 1 may be subjected to a vacuum pretreatment test. After the vacuum pretreatment test, the first test piece 1 may be photographed, its dimensions may be measured, and its weight may be weighed, and the photographs, dimension information, and weight information may be recorded. After the vacuum pretreatment test, the first test piece 1 may be subjected to a heat resistance test. After the heat resistance test, the first test piece 1 may be photographed, and its dimensions and weight may be measured. The dimensions of the first test piece 1 measured after the heat resistance test may be defined as first dimension information, and the weight of the first test piece 1 measured after the heat resistance test may be defined as first weight information.

[0057] like Figure 1 As shown, in step S130, the second test piece 2 is subjected to hot and cold cycle test, vacuum pretreatment test, heat resistance test, hot and cold cycle test, vacuum pretreatment test and heat resistance test in sequence, and the second size information and second weight information corresponding to the second test piece 2 are measured.

[0058] Before conducting various tests, the second test piece 2 can be photographed and weighed, and the weight information of the second test piece 2 before the test can be recorded; the length and width of the first side of the second test piece 2, the length and width of the second side of the second test piece 2 can also be measured and recorded, and at the same time, the length and width of the middle part of the second test piece 2 in the length direction can also be measured and recorded.

[0059] The second test piece 2 may be subjected to a hot and cold cycle test first. After the hot and cold cycle test, the second test piece 2 may be photographed, its dimensions may be measured, and its weight may be weighed, and the photographs, dimension information, and weight information may be recorded. Subsequently, the second test piece 2 may be subjected to a vacuum pretreatment test. After the vacuum pretreatment test, the second test piece 2 may be photographed, its dimensions may be measured, and its weight may be weighed, and the photographs, dimension information, and weight information may be recorded. After the vacuum pretreatment test, the second test piece 2 may be subjected to a heat resistance test. After the heat resistance test, the second test piece 2 may be photographed, and its dimensions and weight may be measured. The hot and cold cycle test, vacuum pretreatment test, and heat resistance test may be repeated on the second test piece 2, and the number of repetitions may be at least one. The dimensions of the second test piece 2 measured after the last repeated test may be defined as the second dimension information, and the weight of the second test piece 2 measured after the last repeated test may be defined as the second weight information.

[0060] like Figure 1 As shown, in step S140, when the difference between the second size information and the first size information is within a first preset range, it is determined that the reusability of the first test piece 1 and the second test piece 2 meets the preset standard; and / or, when the difference between the second weight information and the first weight information is within a second preset range, it is determined that the reusability of the first test piece 1 and the second test piece 2 meets the preset standard.

[0061] The first preset range may be a range set according to the actual situation of the thermal insulation tile. For example, the first preset range may be 0 to 5 mm. That is, when the difference between the second dimension information and the first dimension information is within 0 to 5 mm, it can be determined that the reusability performance of the first test piece 1 and the second test piece 2 meets the preset standard.

[0062] The second preset range may be a range set according to the actual situation of the thermal insulation tile. For example, the second preset range may be 0 to 100 g. That is, when the difference between the second weight information and the first weight information is within 0 to 100 g, it can be determined that the reusability of the first test piece 1 and the second test piece 2 meets the preset standard.

[0063] Alternatively, when the difference between the second size information and the first size information is within 0-5 mm, and the difference between the second weight information and the first weight information is within 0-100 g, it can be determined that the reusability of the first test piece 1 and the second test piece 2 meets the preset standard.

[0064] In the present disclosure, by setting the first preset range and the second preset range, a clear evaluation standard is provided for evaluating the reusability of the thermal insulation tile. By comparing the test results of the size information and weight information of the first test piece 1 and the second test piece 2, the reusability of the thermal insulation tile can be evaluated.

[0065] In an exemplary embodiment of the present disclosure, the test method for the reusable performance test of the rigid thermal insulation tile of the present disclosure may further include steps S210 to S240, wherein:

[0066] Step S210: providing a third test piece and a fourth test piece, wherein the third test piece and the fourth test piece have the same structure, size and material.

[0067] The third test piece and the fourth test piece may be two thermal insulation tile test pieces with the same structure, material and size. The structure of the third test piece and the fourth test piece may be the same as that of the first test piece 1, and their size may be different from or the same as that of the first test piece 1, and no special limitation is made here.

[0068] Step S220, performing a cold-hot cycle test, a vacuum pretreatment test, and a tensile test on the third test piece in sequence, and measuring third size information and third weight information corresponding to the third test piece.

[0069] Before conducting various tests, the third test piece can be photographed and weighed, and the weight information of the third test piece before the test can be recorded; the length and width of the first side of the third test piece, the length and width of the second side of the third test piece can also be measured and recorded, and at the same time, the length and width of the middle part of the third test piece in the length direction can also be measured and recorded.

[0070] The third test piece may first be subjected to a hot and cold cycle test. After the hot and cold cycle test, the third test piece may be photographed, its dimensions may be measured, and its weight may be weighed, and the photographs, dimension information, and weight information may be recorded. Subsequently, the third test piece may be subjected to a vacuum pretreatment test. After the vacuum pretreatment test, the third test piece may be photographed, its dimensions may be measured, and its weight may be weighed, and the photographs, dimension information, and weight information may be recorded. After the vacuum pretreatment test, the third test piece may be subjected to a tensile test. After the tensile test, the third test piece may be photographed, and its dimensions and weight may be measured. The dimensions of the third test piece measured after the tensile test may be defined as third dimension information, and the weight of the third test piece measured after the tensile test may be defined as third weight information.

[0071] Step S230, performing a hot-cold cycle test, a vacuum pretreatment test, a hot-cold cycle test, a vacuum pretreatment test and a tensile test on the fourth test piece in sequence, and measuring fourth size information and fourth weight information corresponding to the fourth test piece.

[0072] Before conducting various tests, the fourth test piece can be photographed and weighed, and the weight information of the fourth test piece before the test can be recorded; the length and width of the first side of the fourth test piece, the length and width of the second side of the fourth test piece can also be measured and recorded, and at the same time, the length and width of the middle part of the length direction of the fourth test piece can also be measured and recorded.

[0073] The fourth test piece may first be subjected to a hot and cold cycle test. After the hot and cold cycle test, the fourth test piece may be photographed, the size may be measured, and the weight may be weighed, and the photographs, size information, and weight information may be recorded. Subsequently, the fourth test piece may be subjected to a vacuum pretreatment test. After the vacuum pretreatment test, the fourth test piece may be photographed, the size may be measured, and the weight may be weighed, and the photographs, size information, and weight information may be recorded. After the vacuum pretreatment test, the hot and cold cycle test and the vacuum pretreatment test may be repeated at least once. Subsequently, the fourth test piece may be subjected to a tensile test. After the tensile test is completed, the fourth test piece may be photographed, and the size and weight of the fourth test piece may be measured; the size of the fourth test piece measured after the tensile test may be defined as fourth size information, and the weight of the fourth test piece measured after the tensile test may be defined as fourth weight information.

[0074] Step S240, when the difference between the fourth size information and the third size information is within a third preset range, it is determined that the reusability of the third test piece and the fourth test piece meets the preset standard; and / or, when the difference between the third weight information and the fourth weight information is within a fourth preset range, it is determined that the reusability of the third test piece and the fourth test piece meets the preset standard.

[0075] The third preset range may be a range set according to the actual situation of the thermal insulation tile. For example, the third preset range may be 0 to 5 mm. That is, when the difference between the fourth dimension information and the third dimension information is within 0 to 5 mm, it can be determined that the reusability of the third test piece and the fourth test piece meets the preset standard.

[0076] The fourth preset range may be a range set according to the actual situation of the thermal insulation tile. For example, the fourth preset range may be 0 to 100g. That is, when the difference between the fourth weight information and the third weight information is within 0 to 100g, it can be determined that the reusability of the third test piece and the fourth test piece meets the preset standard.

[0077] Alternatively, when the difference between the fourth size information and the third size information is within 0-5 mm, and the difference between the fourth weight information and the third weight information is within 0-100 g, it can be determined that the reusability of the third test piece and the fourth test piece meets the preset standard.

[0078] In some embodiments of the present disclosure, the hot and cold cycle test may include step S1 and step S2, wherein:

[0079] S1, heating the first test piece 1, the second test piece 2, the third test piece or the fourth test piece to a first preset temperature and keeping the temperature for a first preset time, wherein the first preset temperature is greater than 100°C.

[0080] A liquid nitrogen environment box can be used to perform a hot and cold cycle test on each test piece (for example, the first test piece 1, the second test piece 2, the third test piece or the fourth test piece). The temperature loading curve of the hot and cold cycle pretreatment test can be set through the control panel of the hot and cold cycle equipment (for example, Figure 3 As shown), each test piece can be automatically heated from room temperature to a first preset temperature and kept warm for a first preset time.

[0081] In an exemplary embodiment of the present disclosure, the first preset temperature may be 120°C to 140°C. For example, it may be 120°C, 125°C, 130°C, 135°C or 140°C. Of course, it may also be other temperatures, which are not listed here one by one.

[0082] In an exemplary embodiment of the present disclosure, the first preset duration may be 8 minutes to 12 minutes. For example, it may be 8 minutes, 9 minutes, 10 minutes, 11 minutes or 12 minutes. Of course, it may also be other durations, which are not listed here one by one.

[0083] S2, lowering the temperature of the first test piece 1, the second test piece 2, the third test piece or the fourth test piece from the first preset temperature to a second preset temperature and maintaining the temperature for a second preset time, wherein the second preset temperature is less than -30°C;

[0084] After the test piece (e.g., the first test piece 1, the second test piece 2, the third test piece, or the fourth test piece) is kept warm for a first preset time, the test piece can be cooled from the first preset temperature to a second preset temperature and maintained for the second preset time. In an exemplary embodiment of the present disclosure, the second preset temperature can be -40°C to -60°C, for example, it can be -40°C, -45°C, -50°C, -55°C, or -60°C. Of course, it can also be other temperatures, which are not listed here one by one.

[0085] In an exemplary embodiment of the present disclosure, the second preset duration may be 8 minutes to 12 minutes. For example, it may be 8 minutes, 9 minutes, 10 minutes, 11 minutes or 12 minutes. Of course, it may also be other durations, which are not listed here one by one.

[0086] Step S1-step S2 may be repeated a preset number of times to more realistically simulate the working condition of the aircraft. For example, the preset number of times may be 110 to 130 times, for example, it may be 110, 115, 120, 125 or 130 times.

[0087] In an exemplary embodiment of the present disclosure, the vacuum pretreatment test includes:

[0088] Place the test piece (for example, the first test piece 1, the second test piece 2, the third test piece or the fourth test piece) in a vacuum container, and set the test pressure and test time through the control panel of the vacuum equipment. For example, the pressure of the vacuum container can be set to less than 1.3×10-5Pa. At the same time, the duration of the vacuum pretreatment test can be set to 1 to 2 days. For example, the duration of the vacuum pretreatment test can be 1 day, 1.5 days or 2 days. After the vacuum pretreatment test is completed, the test piece can also be photographed, and the size information and weight information of the test piece can be recorded.

[0089] In an exemplary embodiment of the present disclosure, the heat resistance test may include steps S310 and S320, wherein:

[0090] Step S310: placing the first test piece 1 or the second test piece 2 on a test bracket, wherein the test bracket is connected to the heating rod.

[0091] The surface of the first test piece 1 or the second test piece 2 can be cleaned, and the cleaned first test piece 1 or the second test piece 2 can be placed on a test bracket in the heat resistance test equipment, and the test bracket can be used to carry the test piece, and the test bracket is connected to the heating rod away from the surface of the test piece. The surface of the test bracket can be provided with a heat insulation pad, and the heat insulation pad is provided with an opening that penetrates the heat insulation pad along the thickness direction of the heat insulation pad. The shape of the opening is the same as the shape of the cross section of the test piece, and its size is larger than the outer peripheral size of the test piece. The test piece can be placed in the opening, and heat insulation cotton can be wrapped around the periphery of the test piece to prevent the accuracy of the test result from being affected by the heat diffusion in the test piece during the test.

[0092] Step S320: heating the first test piece 1 or the second test piece 2 to a third preset temperature by the heating rod, keeping the temperature for a third preset time, and then cooling.

[0093] like Figure 4 As shown, the test piece (for example, the first test piece 1 or the second test piece 2) on the test stand can be heated by a heating rod so that the temperature of the test piece is a third preset temperature and maintained for a third preset time. In some embodiments of the present disclosure, the third preset temperature may be 500°C to 600°C, for example, it may be 500°C, 550°C or 600°C. Of course, the third preset temperature may also be other values, which are not listed here. In some embodiments of the present disclosure, the third preset time may be 80 seconds to 100 seconds, for example, it may be 80 seconds, 85 seconds, 90 seconds, 95 seconds or 100 seconds.

[0094] In an exemplary embodiment of the present disclosure, Figure 5 As shown, before conducting the heat resistance test, multiple thermocouples 3 can be bonded to the first test piece 1 or the second test piece 2 after cleaning. For example, thermocouples 3 can be bonded on each surface of the test piece. For example, a thermocouple 3 can be bonded at the center position of the outer surface of any surface of the test piece, a thermocouple 3 can be bonded at the middle position between the center position and the top surface, a thermocouple 3 can be bonded at the middle position between the center position and the bottom surface, a thermocouple 3 can be bonded at the middle position between the center position and one side surface, and a thermocouple 3 can be bonded at the middle position between the center position and the other side surface; at the same time, thermocouples 3 can also be bonded at positions on the inner surface corresponding to the outer surface, and the temperature value at the bonding position can be detected by the thermocouple 3. After each test piece is kept warm for a third preset time, the thermal insulation performance of the thermal insulation tile can be judged by comparing the temperature values ​​of the outer surface and the inner surface corresponding to each point.

[0095] In an exemplary embodiment of the present disclosure, the tensile test includes steps S410 to S430, wherein:

[0096] Step S410: bonding the upper surface and the lower surface of the third test piece or the fourth test piece to different loading blocks 4 respectively by adhesive, and curing at a fourth preset temperature.

[0097] The adhesive may be an epoxy adhesive, for example, DG-3 adhesive. Figure 2 As shown, the first surface of the third test piece (or the fourth test piece) can be bonded to a loading block 4 by an adhesive, and at the same time, the second surface of the third test piece (or the fourth test piece) can be bonded to another loading block 4. The adhesive can be cured for 4 hours at a fourth preset temperature. The fourth preset temperature is 50°C to 70°C, for example, it can be 50°C, 55°C, 60°C, 65°C or 70°C. Of course, it can also be other temperatures, which are not listed here one by one.

[0098] Step S420 , installing the third test piece bonded with the loading block 4 or the fourth test piece bonded with the loading block 4 on a test fixture of a test machine.

[0099] After the adhesive is cured, the third test piece (or fourth test piece) bonded with the loading block 4 can be assembled on the test fixture, such as Figure 6 As shown, the test fixture may include two fixing parts 5 and two connecting blocks 6, wherein the fixing part 5 may include a chuck 51, a bottom plate 52 and two U-shaped lugs 53, the chuck 51 may be in the shape of a rod, one end of which is connected to the surface of the bottom plate 52, and the two U-shaped lugs 53 are both located on the side of the bottom plate 52 away from the chuck 51, and are connected to the surface of the bottom plate 52 away from the chuck 51; the two U-shaped lugs 53 are arranged at intervals in a direction parallel to the bottom plate 52, and are distributed in parallel. The connecting block 6 may penetrate into between the two U-shaped lugs 53, and after the U-shaped lugs 53 and the connecting block 6 are connected by a pin 7, the chuck 51 and the U-shaped lugs 53 can rotate freely around the pin 7 perpendicular to each other, thereby ensuring the automatic centering of the test fixture, and the cylindrical clamping areas of the upper and lower chucks 51 are located on the same axis. The loading block 4 and the connecting block 6 are fixedly connected by bolts. It should be noted that the connection method of the loading blocks 4 and the connecting blocks 6 at both ends of the third test piece (or the fourth test piece) is the same.

[0100] Step S430: Apply a tensile load to the third test piece or the fourth test piece at a preset loading rate until the third test piece or the fourth test piece is destroyed.

[0101] A load may be applied to the third test piece (or the fourth test piece) through the test fixture. For example, a load may be applied to the third test piece (or the fourth test piece) at a loading rate of 0.5 mm / min until the third test piece (or the fourth test piece) is destroyed. At this time, the tensile strength of the third test piece (or the fourth test piece) when it is destroyed may be recorded, and the third test piece (or the fourth test piece) after the tensile test is completed may be photographed to record the failure mode of the third test piece (or the fourth test piece).

[0102] In an exemplary embodiment of the present disclosure, the tensile strength can be calculated by the following formula:

[0103]

[0104] in:

[0105] σ: tensile strength, in MPa;

[0106] F: failure load, in N;

[0107] A: cross-sectional area of ​​the test piece, in mm 2 .

[0108] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A method for testing the reusability of rigid thermal insulation tiles, characterized in that: include: Providing a first test piece and a second test piece, wherein the first test piece and the second test piece have the same structure, size and material; performing a hot-cold cycle test, a vacuum pretreatment test, and a heat resistance test on the first test piece in sequence, and measuring first dimension information and first weight information corresponding to the first test piece; sequentially performing a hot-cold cycle test, a vacuum pretreatment test, a heat resistance test, a hot-cold cycle test, a vacuum pretreatment test, and a heat resistance test on the second test piece, and measuring second dimension information and second weight information corresponding to the second test piece; When the difference between the second size information and the first size information is within a first preset range, the reusability of the first test piece and the second test piece is determined to meet the preset standard; and / or, when the difference between the second weight information and the first weight information is within a second preset range, the reusability of the first test piece and the second test piece is determined to meet the preset standard.

2. The testing method according to claim 1, characterized in that: The test method also includes: Providing a third test piece and a fourth test piece, wherein the third test piece and the fourth test piece have the same structure, size and material; performing a cold and hot cycle test, a vacuum pretreatment test, and a tensile test on the third test piece in sequence, and measuring third dimension information and third weight information corresponding to the third test piece; performing a hot-cold cycle test, a vacuum pretreatment test, a hot-cold cycle test, a vacuum pretreatment test, and a tensile test on the fourth test piece in sequence, and measuring fourth dimension information and fourth weight information corresponding to the fourth test piece; When the difference between the fourth size information and the third size information is within a third preset range, the reusability of the third test piece and the fourth test piece is determined to meet the preset standard; and / or, when the difference between the third weight information and the fourth weight information is within a fourth preset range, the reusability of the third test piece and the fourth test piece is determined to meet the preset standard.

3. The testing method according to claim 2, characterized in that: The hot and cold cycle test comprises the following steps: S1, heating the first test piece, the second test piece, the third test piece or the fourth test piece to a first preset temperature and keeping the temperature for a first preset time, wherein the first preset temperature is greater than 100° C.; S2, lowering the temperature of the first test piece, the second test piece, the third test piece or the fourth test piece from the first preset temperature to a second preset temperature and maintaining the temperature for a second preset time, wherein the second preset temperature is less than -30°C; Repeat steps S1-S2 for a preset number of times.

4. The testing method according to claim 3, characterized in that: The first preset temperature is 120°C to 140°C; the second preset temperature is -40°C to -60°C.

5. The testing method according to claim 3, characterized in that: The first preset time length and the second preset time length are both 8 minutes to 12 minutes, and the preset number of times is 110 times to 130 times.

6. The testing method according to claim 2, characterized in that: The vacuum pretreatment test includes: The first test piece, the second test piece, the third test piece or the fourth test piece is placed in a vacuum container, and the pressure of the vacuum container is set to be less than 1.3×10 -5 Pa; the duration of the vacuum pretreatment test is 1 to 2 days.

7. The testing method according to claim 1, characterized in that: The heat resistance test includes: Placing the first test piece or the second test piece on a test bracket, wherein the test bracket is connected to a heating rod; The first test piece or the second test piece is heated to a third preset temperature by the heating rod, and is kept at the temperature for a third preset time and then cooled.

8. The testing method according to claim 7, characterized in that: The third preset temperature is 500° C. to 600° C., and the third preset time is 80 seconds to 100 seconds.

9. The testing method according to claim 2, characterized in that: The tensile test includes: Adhere the upper surface and the lower surface of the third test piece or the fourth test piece to different loading blocks respectively by using adhesive, and cure at a fourth preset temperature; Mounting the third test piece bonded with the loading block or the fourth test piece bonded with the loading block on a test fixture of a test machine; A tensile load is applied to the third test piece or the fourth test piece at a preset loading rate until the third test piece or the fourth test piece is destroyed.

10. The testing method according to claim 9, characterized in that: The fourth preset temperature is 50°C to 70°C.

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