Material mechanical property testing environment box and testing method

Abstract

The invention discloses a material mechanical property testing environment box and a testing method, and the material mechanical property testing environment box comprises an upper box body, a lower bottom plate, a control mechanism and a stretching mechanism; the upper box body and the lower bottom plate are detachably and hermetically connected; the stretching mechanism comprises an upper clamp, a lower clamp, a support frame, a ferromagnetic block and an electromagnet; the support frame comprises more than two support arms; one end of each supporting arm comprises a connecting part used for being in sliding connection with a sliding groove in the inner side wall of the upper box body. The other end of each supporting arm is fixedly connected with an upper clamp for fixing the upper end of a sample; a lower clamp for fixing the lower end of the sample is fixedly connected with the lower bottom plate; the inner top wall of the upper box body is fixedly connected with an electromagnet; the support frame is fixedly connected with a ferromagnetic block; the electromagnet is in circuit connection with the control mechanism through a lead hole formed in the inner top wall; according to the invention, the problem of gas leakage in the environment box caused by dynamic seal failure is avoided, and a stable and reliable hydrogen pressure environment is provided for material mechanical property test and evaluation.

Description

Technical Field

[0001] The invention relates to the technical field of material mechanical property testing, and in particular to a material mechanical property testing environment box and a testing method. Background Art

[0002] As a renewable secondary energy source, hydrogen has the advantages of wide sources, clean and efficient, and rich application scenarios. The role of hydrogen in the world's energy transformation is becoming increasingly prominent.

[0003] Currently, hydrogen storage and transportation are mainly carried out in the form of storage or transportation under high-pressure gas. Due to the small mass of hydrogen, it is easy to leak and spread, has low ignition energy, and a wide explosion range. Therefore, it is crucial to ensure the long-term safe and stable operation of hydrogen storage and transportation facilities.

[0004] In order to ensure the long-term safe and stable operation of hydrogen storage and transportation facilities, it is also very important to study the mechanical properties of materials under hydrogen pressure environment and clarify the compatibility of materials with hydrogen. At present, most of them simulate the high-pressure hydrogen environment through environmental chambers, and carry out material mechanical property tests in environmental chambers. This performance test method has strict requirements on the sealing, safety and reliability of environmental chambers, especially when the test device contains moving parts, the sealing of the moving parts is particularly critical. Most of the environmental chambers of existing test devices adopt dynamic sealing structures.

[0005] The inventor has found through research that the environmental chamber of the test device in the prior art still has at least the following defects:

[0006] In a high pressure environment such as a gaseous hydrogen pressure environment, an environmental box with a dynamic seal structure is prone to hydrogen leakage.

[0007] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0008] The purpose of the present invention is to provide a material mechanical property test environment box and a test method capable of preventing hydrogen leakage.

[0009] The present invention provides a material mechanical property test environment box, which is used for material mechanical property test in a gaseous hydrogen pressure environment, and comprises an upper box body, a lower bottom plate, a control mechanism and a stretching mechanism;

[0010] The upper box body and the lower base plate are detachably and airtightly connected;

[0011] The stretching mechanism comprises an upper clamp, a lower clamp, a support frame, a ferromagnetic block and an electromagnet, wherein:

[0012] The support frame includes more than two support arms; one end of each support arm includes a connection portion for slidingly connecting with the slide groove of the inner wall of the upper box body; the other end of each support arm is fixedly connected to the upper clamp for fixing the upper end of the sample; the lower clamp for fixing the lower end of the sample is fixedly connected to the lower bottom plate;

[0013] An electromagnet is fixedly connected to the inner top wall of the upper box body; a ferromagnetic block is fixedly connected to the support frame; and the electromagnet is connected to the control mechanism circuit through a lead hole arranged on the inner top wall.

[0014] Preferably, in an embodiment of the present invention, the support frame comprises:

[0015] The support frame is cross-shaped or M-shaped.

[0016] Preferably, in an embodiment of the present invention, a ferromagnetic block is fixedly connected to the support frame, comprising:

[0017] A ferromagnetic block is provided at the connection portion between each of the support arms and the upper clamp.

[0018] Preferably, in an embodiment of the present invention, the ferromagnetic block comprises:

[0019] A plurality of support arms are arranged in the circumferential direction of the ferromagnetic block.

[0020] Preferably, in an embodiment of the present invention, the support arm comprises:

[0021] The lengths of the support arms are all equal.

[0022] Preferably, in the embodiment of the present invention, one end of each of the support arms includes a connecting portion for slidingly connecting with a slide groove of the inner side wall of the upper box body, including:

[0023] The connecting portion at one end of each support arm and the slide groove are in interference fit.

[0024] Preferably, in an embodiment of the present invention, the connection structure between the upper box body and the lower base plate comprises:

[0025] Fastening bolts for airtight connection between the upper box body and the lower base plate;

[0026] A sealing ring is arranged in the groove of the lower base plate.

[0027] Preferably, in an embodiment of the present invention, the control mechanism comprises:

[0028] Electromagnet circuit control module, pressure sensing module and mechanical properties testing module.

[0029] Preferably, in an embodiment of the present invention, the lower base plate is fixedly connected to the test bench.

[0030] Preferably, in an embodiment of the present invention, the lower base plate is fixedly connected to the test bench, comprising:

[0031] The distance between the lower base plate and the test bench can adjust the lower end of the fastening bolt.

[0032] In another aspect of the present invention, a material mechanical properties testing method is also provided, which is applicable to the above-mentioned material mechanical properties testing environment box, comprising the steps of:

[0033] S11, presetting environmental parameters of the environmental box; the environmental parameters include the preset gas type and the corresponding pressure parameter value in the environmental box;

[0034] S12, calculating the current value required by the electromagnet according to the pulling force value required by the experiment;

[0035] S13. When the ambient pressure in the environmental box reaches the pressure parameter value, the current value of the electromagnet is controlled by the control mechanism to adjust the upward pulling force of the ferromagnetic block along the slide groove to the pulling force value required for the experiment.

[0036] Preferably, in the embodiment of the present invention, it also includes:

[0037] S14. According to the actual tensile force value of the sample and the tensile displacement of the sample, the mechanical property parameter value of the material of the sample in the gaseous environment is obtained.

[0038] Preferably, in an embodiment of the present invention, the preset gas types include:

[0039] Nitrogen and / or hydrogen.

[0040] Preferably, in an embodiment of the present invention, when the ambient pressure in the environmental box reaches the pressure parameter value, the method further comprises:

[0041] Stabilize the environmental chamber.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] The invention provides a material mechanical property test environment box, which is used for material mechanical property test under gaseous hydrogen pressure environment, and comprises an upper box body, a lower bottom plate, a control mechanism and a stretching mechanism; the stretching mechanism comprises an upper clamp, a lower clamp, a support frame, a ferromagnetic block and an electromagnet, wherein the support frame comprises more than two support arms; one end of each support arm comprises a connecting portion for sliding connection with a slide groove on the inner wall of the upper box body; the other end of each support arm is fixedly connected to the upper clamp for fixing the upper end of the sample, thereby realizing the sliding connection between the support frame and the upper box body; the lower clamp for fixing the lower end of the sample is fixedly connected to the lower bottom plate; the upper box body and the lower bottom plate are detachably and airtightly connected, thereby making the entire stretching mechanism airtight in the environment box; the inner top wall of the upper box body is fixedly connected with an electromagnet; the support frame is fixedly connected with a ferromagnetic block; the electromagnet is connected with a control mechanism circuit through a lead hole arranged on the inner top wall, and the sample is stretched by energizing the electromagnet to adsorb the ferromagnetic block.

[0044] The working principle of the material mechanical property testing environment box of the present invention is to control the magnitude of the gravitational force exerted on the ferromagnetic block upward to the top of the box body by adjusting the amount of current connected to the electromagnet; thereby achieving control of the tensile force of the sample; because in the embodiment of the present invention, it is no longer necessary to set a dynamic sealing structure on the sealed box body to transmit force to the sample, the problem of gas leakage in the environment box due to dynamic sealing failure in the environment box with a dynamic sealing structure in the prior art is effectively avoided, thereby providing a stable and reliable hydrogen pressure environment for material mechanical property testing and evaluation, and further reducing the risk of the test.

[0045] In addition, in the present invention, by adjusting the upper clamp on the support frame by moving it up and down, the stretching direction of the sample can be accurately controlled, making the experimental data more accurate.

[0046] In addition, the material mechanical property testing environment box of the present invention avoids the fixed connection between the upper clamp and the upper box body, making the assembly of the sample simpler and faster and the test operation more convenient.

[0047] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, and to make the above and other purposes, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 It is a structural schematic diagram of the material mechanical properties test environment box in the present invention;

[0050] Figure 2 It is a step diagram of the material mechanical property testing method in the present invention. DETAILED DESCRIPTION

[0051] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0052] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0053] In this document, the terms "first", "second", etc. are used to distinguish two different elements or parts, and are not used to limit a specific position or relative relationship. In other words, in some embodiments, the terms "first", "second", etc. can also be interchangeable.

[0054] Embodiment 1

[0055] In order to solve the problem that the environmental chamber with dynamic sealing structure is prone to hydrogen leakage, such as Figure 1 As shown, in an embodiment of the present invention, a material mechanical property test environment box is provided, which is used for material mechanical property test in a gaseous hydrogen pressure environment, and includes an upper box body 100, a lower bottom plate 200, a control mechanism 300 and a stretching mechanism;

[0056] The upper box body 100 and the lower base plate 200 are detachably and hermetically connected;

[0057] The stretching mechanism includes an upper clamp 3, a lower clamp 4, a support frame 6, a ferromagnetic block 7 and an electromagnet 9, wherein:

[0058] The support frame 6 includes more than two support arms; one end of each support arm includes a connection portion for slidingly connecting with the slide groove 8 of the inner wall of the upper box body; the other end of each support arm is fixedly connected with the upper clamp 3 for fixing the upper end of the sample 5; the lower clamp 4 for fixing the lower end of the sample 5 is fixedly connected with the lower bottom plate 200;

[0059] The inner top wall of the upper box body 100 is fixedly connected with an electromagnet 9; the support frame 6 is fixedly connected with a ferromagnetic block 7; the electromagnet 9 is connected with the control mechanism 300 through a lead hole provided on the inner top wall through an electric circuit.

[0060] The inventive concept of the embodiment of the present invention includes: the environmental box provided with a dynamic sealing structure in the prior art is prone to hydrogen leakage in a high-pressure environment such as a gaseous hydrogen pressure environment, thereby increasing the risk of the experiment.

[0061] Based on this, in an embodiment of the present invention, the entire stretching mechanism is placed in a closed environmental chamber, and the amount of current connected to the electromagnet is adjusted by a control mechanism to adjust the magnitude of the gravitational force of the ferromagnetic block upward to the top of the box, thereby achieving control of the stretching force of the sample; since in the embodiment of the present invention the entire stretching mechanism is completely placed in the closed environmental chamber, there is no need to set a dynamic sealing structure on the sealed box to transmit force to the sample, thus effectively avoiding the problem of gas leakage in the environmental chamber due to failure of the dynamic sealing structure in the prior art, thereby providing a stable and reliable hydrogen pressure environment for material mechanical property testing and evaluation.

[0062] Furthermore, in an embodiment of the present invention, the upper box body 100 and the lower base plate 200 are fixedly connected by fastening bolts 2, the lower clamp 4 is fixedly connected to the lower base plate 200 by bolts 10, and a sealing ring 1 is provided in the groove of the lower base plate 200, and the connecting surface of the upper box body 100 and the lower base plate 200 is sealed by the sealing ring 1; thereby, the sealing effect of the entire environmental chamber is better.

[0063] In the embodiment of the present invention, the support frame 6 includes more than two support arms, each of which is slidably connected to the slide groove 8 on the inner side wall of the upper box body 100 through a connecting portion at one end; the other end of each support arm is fixedly connected to the upper clamp 3 for fixing the upper end of the sample 5. The support frame 6 can be set as two support arms, each of which is slidably connected to the slide groove 8 on the inner side wall of the upper box body 100 through a connecting portion at one end, and the other end of each support arm is arranged on symmetrical sides of the upper clamp 3; this can ensure the balance and stability of the upper clamp 3.

[0064] In order to make the upper clamp 3 stably fix the upper end of the sample, in the embodiment of the present invention, the support frame 6 can be set to a cross shape or a cross shape, so that the stability of the upper clamp 3 is better. In addition, the connecting portion at one end of each support arm and the slide groove 8 are interference fit, so that the upper clamp 3 is more stable.

[0065] In addition, the support frame 6 can also be arranged on two symmetrical sides of the upper clamp 3 and are four parallel support arms. Each support arm is slidably connected to the slide groove of the inner wall of the upper box body 100 through a connecting part at one end, and the other end of each support arm is fixedly connected to the upper clamp 3 used to fix the upper end of the sample 5, which can ensure the balance and stability of the upper clamp 3.

[0066] In addition, according to the shape of the environmental chamber, the support frame 6 can also be set as three support arms, and each support arm is slidably connected to the slide groove of the inner wall of the upper box body 100 through a connecting part at one end; the other end of each support arm is fixedly connected to the upper clamp 3 used to fix the upper end of the sample 5, forming a Y shape, which can also ensure the balance and stability of the upper clamp 3.

[0067] In the embodiment of the present invention, the slide groove 8 can be set as a groove track, and the support frame 6 can be adjusted to move up and down by the groove track, thereby adjusting the position of the upper clamp 3 to achieve precise control of the stretching direction of the sample. In order to ensure precise control of the stretching direction, the position of the support frame 6 is adjusted so that the lower end surface of the lower clamp 4 is as flush as possible with the open end surface of the upper box 100.

[0068] Furthermore, in an embodiment of the present invention, a ferromagnetic block 7 is fixedly connected to the support frame 6, and a ferromagnetic block 7 is provided at the connecting portion between each support arm and the upper end of the upper clamp 3; and the support frame 6, the ferromagnetic block 7 and the upper clamp 3 are fixed as an integrated structure, which can make the test operation more convenient.

[0069] Furthermore, in an embodiment of the present invention, a plurality of support arms are arranged in the circumferential direction of the ferromagnetic block 7, and the plurality of support arms make the support frame 6 more stable. In order to ensure that the fixed integrated structure of the support frame 6, the ferromagnetic block 7 and the upper clamp 3 is more stable, the lengths of the support arms of the ferromagnetic block 7 are equal.

[0070] Furthermore, in an embodiment of the present invention, the control mechanism 300 includes an electromagnet circuit control module; the top wall of the upper box body 100 is provided with lead holes corresponding to the electromagnet circuit control module, the pressure sensing module and the mechanical property testing module; after the electromagnet circuit control module energizes the electromagnet 9, the electromagnetic force of the electromagnet 9 generates an attractive force on the ferromagnetic block 7, thereby stretching the sample 5.

[0071] It should be noted that, in the embodiment of the present invention, the current value required by the electromagnet 9 can be calculated according to the tension value required for the experiment, and the current value of the electromagnet can be adjusted by the electromagnet circuit control module to adjust the upward tension of the ferromagnetic block 7 along the slide groove 8 to the tension value required for the experiment, thereby meeting different stretching requirements.

[0072] In summary, the present invention provides an environmental box for testing the mechanical properties of materials, which is used for testing the mechanical properties of materials under a gaseous hydrogen pressure environment, and comprises an upper box body, a lower bottom plate, a control mechanism and a stretching mechanism; the stretching mechanism comprises an upper clamp, a lower clamp, a support frame, a ferromagnetic block and an electromagnet, wherein the support frame comprises more than two support arms; one end of each support arm comprises a connecting portion for sliding connection with a slide groove on the inner wall of the upper box body; the other end of each support arm is fixedly connected to an upper clamp for fixing the upper end of a sample, thereby realizing a sliding connection between the support frame and the upper box body; the lower clamp for fixing the lower end of the sample is fixedly connected to the lower bottom plate; the upper box body and the lower bottom plate are detachably and airtightly connected, thereby making the entire stretching mechanism airtight in the environmental box; the inner top wall of the upper box body is fixedly connected with an electromagnet; the support frame is fixedly connected with a ferromagnetic block; the electromagnet is connected to the control mechanism circuit through a lead hole arranged on the inner top wall, and the sample is stretched by energizing the electromagnet to adsorb the ferromagnetic block.

[0073] The working principle of the material mechanical property testing environment box of the present invention is to control the magnitude of the gravitational force exerted on the ferromagnetic block upward to the top of the box body by adjusting the amount of current connected to the electromagnet; thereby achieving control of the tensile force of the sample; because in the embodiment of the present invention, it is no longer necessary to set a dynamic sealing structure on the sealed box body to transmit force to the sample, the problem of gas leakage in the environmental box due to dynamic sealing failure in the environmental box with a dynamic sealing structure in the prior art is effectively avoided, thereby providing a stable and reliable hydrogen pressure environment for material mechanical property testing and evaluation, and further reducing the risk of the test.

[0074] In addition, in the present invention, by adjusting the upper clamp on the support frame by moving it up and down, the stretching direction of the sample can be accurately controlled, making the experimental data more accurate.

[0075] In addition, the material mechanical property testing environment box of the present invention avoids the fixed connection between the upper clamp and the upper box body, making the assembly of the sample simpler and faster and the test operation more convenient.

[0076] Embodiment 2

[0077] On the basis of the first embodiment, the control mechanism 300 in the embodiment of the present invention may further include a pressure sensing module and a mechanical property testing module;

[0078] Nitrogen and hydrogen (or one of the gases) are filled into the environmental box through the inflation port of the upper box body 100, and the pressure value in the environmental box is obtained through the pressure sensing module; if the pressure value in the environmental box exceeds the preset pressure parameter value, the air can be exhausted and the pressure can be reduced through the outlet of the upper box body 100, so that the ambient pressure in the environmental box is reduced to the preset pressure parameter value.

[0079] The mechanical properties test module can obtain the actual tensile force value of the sample under different currents, combined with the tensile displacement of the sample under the tensile force, to obtain the mechanical properties parameter value of the sample material in the gaseous environment. The tensile displacement of the sample is obtained by a displacement measuring device installed on the sample, such as an extensometer.

[0080] Furthermore, in an embodiment of the present invention, the lower base plate 200 is fixedly connected to the test bench to further stabilize the environmental chamber; a certain distance is set between the lower base plate 200 and the test bench so that the lower end of the fastening bolt 2 can be adjusted.

[0081] The specific implementation of the present invention is described below in conjunction with a specific application scenario. Figure 1, in this specific application scenario, first unscrew all the fastening bolts 2, lift up vertically and remove the upper box body 100, take out the upper clamp 3 along the slide groove 8 (the support frame 6, the ferromagnetic block 7 and the upper clamp 3 are a fixed integrated structure), that is, take out the fixed integrated structure with the support frame 6, the ferromagnetic block 7 and the upper clamp 3, unscrew all the bolts 10 on the lower base plate 200, and remove the lower clamp 6; then fix the sample 5 on the upper clamp 3 first, and then fix it on the lower clamp 4; assemble the fixed integrated structure with the support frame 6, the ferromagnetic block 7 and the upper clamp 3 in the upper box body 100 along the slide groove 8, adjust the upper and lower positions of the support frame 6 during installation, so that the lower end surface of the lower clamp 4 is as flush as possible with the opening end surface of the upper box body 100; finally, place the upper box body 100 on the lower base plate 200, align the sealing ring 1 and all the bolt holes, and tighten all the fastening bolts 2 in turn in a symmetrical manner, and tighten all the bolts 10 in the same way.

[0082] According to the preset gas type of the preset environmental box, nitrogen and hydrogen are filled into the environmental box in sequence (it can also be one of the gases according to the test requirements), and the environmental box is pressure tested. When the environmental pressure in the environmental box reaches the preset pressure parameter value, the environmental box is stabilized; after the pressure of the environmental box is stabilized, the electromagnet 9 is energized, and the electromagnet 9 generates magnetic force to adsorb the ferromagnetic block 7 to achieve the stretching of the sample. It should be noted that the current value required by the electromagnet 9 can be calculated according to the tension value required by the experimental requirements, and the current value of the electromagnet 9 can be controlled by the electromagnet circuit control module to meet different stretching requirements.

[0083] Embodiment 3

[0084] The embodiment of the present invention is adapted to the material mechanical properties test environment box in the above-mentioned embodiment 1, and further provides a material mechanical properties test method. That is, the material mechanical properties test method in the embodiment of the present invention can be implemented using the material mechanical properties test environment box in the embodiment 1. Figure 2 As shown, the specific steps include:

[0085] S11, preset environmental parameters of the environmental box; the environmental parameters include preset gas types and corresponding pressure parameter values ​​in the environmental box.

[0086] In the embodiment of the present invention, the preset gas type includes: nitrogen and / or hydrogen. In a specific application scenario, nitrogen and hydrogen can be filled into the environmental chamber, and any one of the gases can be filled according to the test requirements.

[0087] S12. Calculate the current value required by the electromagnet based on the pulling force value required for the experiment.

[0088] S13. When the ambient pressure in the environmental box reaches the pressure parameter value, the current value of the electromagnet is controlled by the control mechanism to adjust the upward pulling force of the ferromagnetic block along the slide groove to the pulling force value required for the experiment.

[0089] In the implementation of the present invention, when the environmental pressure in the environmental box reaches the pressure parameter value, the environmental box is further stabilized. That is, when the environmental pressure in the environmental box reaches the preset pressure parameter value, the environmental box is stabilized; after the pressure in the environmental box is stabilized for a period of time, the electromagnet 9 is energized, and the electromagnet 9 generates a magnetic force to attract the ferromagnetic block 7, so as to stretch the sample 5.

[0090] Furthermore, in the embodiment of the present invention, it also includes:

[0091] S14. According to the actual tensile force value of the sample and the tensile displacement of the sample, the mechanical property parameter value of the material of the sample in the gaseous environment is obtained.

[0092] In the embodiment of the present invention, the actual tensile force value of the sample under different currents can be obtained by the mechanical property testing module, and the tensile displacement of the sample under the tensile force can be combined to obtain the mechanical property parameter value of the material of the sample in the gaseous environment. The tensile displacement of the sample is obtained by a displacement measuring device installed on the sample, such as an extensometer.

[0093] In summary, the present invention provides an environmental box for testing the mechanical properties of materials, which is used for testing the mechanical properties of materials under a gaseous hydrogen pressure environment, and comprises an upper box body, a lower bottom plate, a control mechanism and a stretching mechanism; the stretching mechanism comprises an upper clamp, a lower clamp, a support frame, a ferromagnetic block and an electromagnet, wherein the support frame comprises more than two support arms; one end of each support arm comprises a connecting portion for sliding connection with a slide groove on the inner wall of the upper box body; the other end of each support arm is fixedly connected to the upper clamp for fixing the upper end of the sample, thereby realizing a sliding connection between the support frame and the upper box body; the lower clamp for fixing the lower end of the sample is fixedly connected to the lower bottom plate; the upper box body and the lower bottom plate are detachably and airtightly connected, thereby making the entire stretching mechanism airtight in the environmental box; the inner top wall of the upper box body is fixedly connected with an electromagnet; the support frame is fixedly connected with a ferromagnetic block; the electromagnet is connected to the control mechanism circuit through a lead hole arranged on the inner top wall, and the sample is stretched by energizing the electromagnet to adsorb the ferromagnetic block.

[0094] The working principle of the material mechanical property testing environment box of the present invention is to control the magnitude of the gravitational force exerted on the ferromagnetic block upward to the top of the box body by adjusting the amount of current connected to the electromagnet; thereby achieving control of the tensile force of the sample; because in the embodiment of the present invention, it is no longer necessary to set a dynamic sealing structure on the sealed box body to transmit force to the sample, the problem of gas leakage in the environmental box due to dynamic sealing failure in the environmental box with a dynamic sealing structure in the prior art is effectively avoided, thereby providing a stable and reliable hydrogen pressure environment for material mechanical property testing and evaluation, and further reducing the risk of the test.

[0095] In addition, in the present invention, by adjusting the upper clamp on the support frame by moving it up and down, the stretching direction of the sample can be accurately controlled, making the experimental data more accurate.

[0096] In addition, the material mechanical property testing environment box of the present invention avoids the fixed connection between the upper clamp and the upper box body, making the assembly of the sample simpler and faster and the test operation more convenient.

[0097] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0098] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0099] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0100] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0101] It should be understood that in the embodiments of the present application, the various embodiments and features can be combined with each other to solve the aforementioned technical problems.

[0102] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0103] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A material mechanical properties test environment box, used for material mechanical properties testing under gaseous hydrogen pressure environment, characterized in that: It includes an upper box body, a lower bottom plate, a control mechanism and a stretching mechanism; The upper box body and the lower base plate are detachably and airtightly connected; The stretching mechanism comprises an upper clamp, a lower clamp, a support frame, a ferromagnetic block and an electromagnet, wherein: The support frame includes more than two support arms; one end of each support arm includes a connection portion for slidingly connecting with the slide groove of the inner wall of the upper box body; the other end of each support arm is fixedly connected to the upper clamp for fixing the upper end of the sample; the lower clamp for fixing the lower end of the sample is fixedly connected to the lower bottom plate; An electromagnet is fixedly connected to the inner top wall of the upper box body; a ferromagnetic block is fixedly connected to the support frame; and the electromagnet is connected to the control mechanism circuit through a lead hole arranged on the inner top wall.

2. The material mechanical properties testing environment chamber according to claim 1, characterized in that: The support frame comprises: The support frame is cross-shaped or M-shaped.

3. The material mechanical properties testing environment box according to claim 2, characterized in that: The support frame is fixedly connected with a ferromagnetic block, including: A ferromagnetic block is provided at the connection portion between each of the support arms and the upper clamp.

4. The material mechanical properties testing environment box according to claim 3, characterized in that: The ferromagnetic block comprises: A plurality of support arms are arranged in the circumferential direction of the ferromagnetic block.

5. The material mechanical properties testing environment box according to claim 4, characterized in that: The support arm comprises: The lengths of the support arms are all equal.

6. The material mechanical properties testing environment chamber according to claim 1, characterized in that: One end of each of the support arms includes a connection portion for slidingly connecting with a slide groove on the inner wall of the upper box body, including: The connecting portion at one end of each support arm and the slide groove are in interference fit.

7. The material mechanical properties testing environment chamber according to claim 6, characterized in that: The connection structure between the upper box and the lower base plate includes: Fastening bolts for airtight connection between the upper box body and the lower base plate; A sealing ring is arranged in the groove of the lower base plate.

8. The material mechanical properties testing environment box according to claim 7, characterized in that: The control mechanism comprises: Electromagnet circuit control module, pressure sensing module and mechanical properties testing module.

9. The material mechanical properties testing environment box according to claim 8, characterized in that: The lower base plate is fixedly connected to the test bench.

10. The material mechanical properties testing environment chamber according to claim 9, characterized in that: The lower base plate is fixedly connected to the test bench and includes: The distance between the lower base plate and the test bench can adjust the lower end of the fastening bolt.

11. A material mechanical property testing method, applicable to the material mechanical property testing environment box as claimed in any one of claims 1 to 10, characterized in that: Includes steps: S11, presetting environmental parameters of the environmental box; the environmental parameters include the preset gas type and the corresponding pressure parameter value in the environmental box; S12, calculating the current value required by the electromagnet according to the pulling force value required by the experiment; S13. When the ambient pressure in the environmental box reaches the pressure parameter value, the current value of the electromagnet is controlled by the control mechanism to adjust the upward pulling force of the ferromagnetic block along the slide groove to the pulling force value required for the experiment.

12. The material mechanical properties testing method according to claim 11, characterized in that: Also includes: S14. According to the actual tensile force value of the sample and the tensile displacement of the sample, the mechanical property parameter value of the material of the sample in the gaseous environment is obtained.

13. The material mechanical property testing method according to claim 12, characterized in that: The preset gas types include: Nitrogen and / or hydrogen.

14. The material mechanical property testing method according to claim 13, characterized in that: When the environmental pressure in the environmental box reaches the pressure parameter value, the method further includes: Stabilize the environmental chamber.

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