Material performance detection device

Abstract

The invention relates to a material performance detection device which is used for detecting the mechanical resistance of a sample in a high-pressure hydrogen environment, the sample is of a hollow tubular structure, and the detection device comprises two sample clamps which are respectively clamped at the two ends of the sample; the oxidation pond is filled with a sodium hydroxide solution, and the sample clamp and the sample are contained in the oxidation pond; the three-electrode system is used for monitoring the hydrogen permeation amount of the sample, the three-electrode system comprises an auxiliary electrode, a reference electrode and a working electrode which are contained in the oxidation pond and jointly connected to the electrochemical measurement equipment, the auxiliary electrode and the sample are arranged at an interval, and the reference electrode and the working electrode are arranged at an interval and abut against the sample; the hydrogen supply part comprises a hydrogen pipeline, and the hydrogen pipeline penetrates through the oxidation pond and is in gas communication with one end of the sample. The hydrogen permeation amount of the sample is obtained in real time while the material performance of the sample is tested, so that the sample detection requirement is met, and the test risk is reduced.

Description

Technical Field

[0001] This disclosure relates to the field of material performance testing technology, and more specifically, to a material performance testing device. Background Technology

[0002] High-pressure gaseous hydrogen storage and transportation is a relatively mature method for hydrogen energy storage and transportation. However, the mechanical properties of materials exposed to high-pressure hydrogen environments for extended periods deteriorate due to hydrogen embrittlement, especially under fatigue loads, where fatigue performance suffers a severe decline. Key equipment in the hydrogen energy industry chain, such as high-pressure liquid hydrogen pumps, hydrogen expanders, high-pressure hydrogen vaporizers, and high-pressure hydrogen compressors, exhibit typical high-cycle fatigue characteristics. To ensure the reliable operation of hydrogen energy equipment, it is essential to test the fatigue resistance of materials under high-pressure hydrogen environments.

[0003] In traditional material performance testing, high-pressure hydrogen environment testing primarily involves connecting a high-pressure hydrogen environment chamber to a conventional testing machine. The sample, sample clamps, and measuring instruments are all installed inside the chamber, resulting in a chamber volume between 15L and 29L. This leads to a large hydrogen capacity, making the high-pressure hydrogen seal prone to leakage during fatigue testing, posing a high risk. Furthermore, traditional high-pressure hydrogen testing methods struggle to obtain the hydrogen permeation rate within the sample, making it impossible to establish a relationship between hydrogen permeation and material properties. Summary of the Invention

[0004] The purpose of this disclosure is to provide a material performance testing device that can at least partially solve the technical problems existing in the related art.

[0005] To achieve the above objectives, this disclosure provides a material property testing device for testing the mechanical toughness of a sample under high-pressure hydrogen conditions. The sample has a hollow tubular structure. The testing device includes: Two sample clamps, which respectively clamp the two ends of the sample; An oxidation tank filled with sodium hydroxide solution, the sample holder and the sample are housed in the oxidation tank; A three-electrode system is used to monitor the hydrogen permeation of the sample. The three-electrode system includes an auxiliary electrode, a reference electrode, and a working electrode, which are housed in the oxidation cell and connected to the electrochemical measurement device. The auxiliary electrode is spaced apart from the sample, and the reference electrode and the working electrode are spaced apart and abut against the sample. A hydrogen supply unit, comprising a hydrogen pipeline passing through the oxidation pool and in gas communication with one end of the sample.

[0006] Optionally, a sealing valve is also included, which is disposed at the end of the sample away from the hydrogen pipeline.

[0007] Optionally, one of the two sample clamps is fixed to the top wall of the oxidation tank; the detection device further includes a loading rod and a force-applying part for outputting loading force, wherein the loading rod passes through the bottom wall of the oxidation tank and is configured to reciprocate along its own axis, one end of the loading rod is connected to the other of the two sample clamps, and the other end extends out of the oxidation tank and is connected to the force-applying part.

[0008] Optionally, a first through hole is provided on the bottom wall, and the detection device further includes a sealing plug sealed at the first through hole. The sealing plug has a second through hole through which the loading rod passes to extend into the oxidation tank, and a first sealing element is provided between the second through hole and the loading rod.

[0009] Optionally, a lubricating medium is coated between the first seal and the loading rod.

[0010] Optionally, the inner wall of the second through hole is formed with a first mounting groove for the first seal to be embedded.

[0011] Optionally, the sealing plug includes: The smaller diameter section, with its outer diameter matching the inner diameter of the first through hole, is sealed and embedded within the first through hole; and The large-diameter section has an outer diameter larger than that of the small-diameter section. The large-diameter section extends out of the first through hole and is coaxially connected to the lower part of the small-diameter section, and the top surface of the large-diameter section is attached to the bottom wall.

[0012] Optionally, a second sealing element is provided between the top surface of the large-diameter section and the bottom wall, and a second mounting groove for embedding the second sealing element is provided on the top surface of the large-diameter section.

[0013] Alternatively, the hydrogen pipeline may be a telescopic tube that can extend and retract along its own axial direction.

[0014] Optionally, the hydrogen supply unit includes a high-pressure gas tank, which is located outside the oxidation pool and is used to supply high-pressure hydrogen to the hydrogen pipeline.

[0015] The above technical solution involves passing a hydrogen pipeline through an oxidation pool to introduce high-pressure hydrogen into a sample with a hollow tubular structure, thereby filling the sample with hydrogen. A three-electrode system is then connected between the sample, the hydrogen permeation solution, and the electrochemical measurement equipment. This allows for the simultaneous testing of the sample's material properties under high-pressure hydrogen conditions and the real-time measurement of the sample's hydrogen permeation. This ensures that the hydrogen supply meets the sample's testing requirements while reducing testing risks.

[0016] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram illustrating the use of the material property testing device provided in an exemplary embodiment of this disclosure; Figure 2 yes Figure 1 Enlarged view of section A.

[0018] Explanation of reference numerals in the attached figures 100-Sample; 110-Sealing valve; 200-Sample clamp; 210-First sample clamp; 220-Second sample clamp; 300-Oxidation pool; 310-Top wall; 320-Bottom wall; 321-First through hole; 400-Hydrogen supply unit; 410-Hydrogen pipeline; 420-High-pressure gas tank; 430-Regulating valve; 510-Loading rod; 520-Force application unit; 530-Power output rod; 600-Sealing plug; 610-Second through hole; 611-First mounting groove; 620-Small diameter section; 630-Large diameter section; 631-Second mounting groove; 710-First seal; 720-Second seal; 800-Three-electrode system; 810-Auxiliary electrode; 820-Reference electrode; 830-Working electrode; 900-Electrochemical measuring equipment. Detailed Implementation

[0019] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0020] In this disclosure, unless otherwise stated, directional terms such as "inner" and "outer" refer to the outline of the corresponding component itself; directional terms such as "upper," "lower," "top," and "bottom" are defined based on the usage habits of the detection device provided in this disclosure. Specifically, please refer to... Figure 1 The orientation of the drawing is shown. Terms such as "first" and "second" used in this disclosure are for distinguishing one element from another and do not indicate sequence or importance. Furthermore, in the following description, when referring to the accompanying drawings, the same reference numerals in different drawings denote the same or similar elements.

[0021] Reference Figure 1This disclosure provides a material performance testing device. The device can be used to test the mechanical toughness of a sample 100 supported by the material to be tested under high-pressure hydrogen conditions. The testing device may include a sample clamp 200, an oxidation tank 300, and a hydrogen supply unit 400. The sample 100 may be constructed as a hollow tubular structure, with two sample clamps 200 respectively clamped at both ends to ensure the stability of the sample 100 within the oxidation tank 300. The hydrogen supply unit 400 may include a hydrogen pipeline 410 for conveying high-pressure hydrogen. One end of the hydrogen pipeline 410 may pass through the oxidation tank 300 and be in gas communication with one end of the sample 100, thereby introducing high-pressure hydrogen into the sample 100, placing the sample 100 in a high-pressure hydrogen environment. This satisfies the testing requirements of the sample 100 while ensuring a sealed environment for the high-pressure hydrogen, preventing leakage. The detection apparatus provided in this disclosure may further include an oxidation cell 300, a sample holder 200, and a sample 100, which can be housed inside the oxidation cell 300 to prevent hydrogen leakage due to breakage of the sample 100. A hydrogen pipeline 410 can pass through the oxidation cell 300 and then through the sample holder 200 to introduce hydrogen into the sample 100 inside the oxidation cell 300. In this disclosure, when the internal diameter of the sample 100 is d = 12 mm and the length is 15d = 180 mm, the internal hydrogen content of the sample 100 is 0.02 L, which is 750 times less than the amount of hydrogen required for mechanical testing of the sample 100 in related technologies.

[0022] Reference Figure 1The detection device may further include a three-electrode system 800, which can be used to monitor the hydrogen permeation of the sample 100. The three-electrode system 800 may include an auxiliary electrode 810, a reference electrode 820, and a working electrode 830 housed within the oxidation pool 300. The auxiliary electrode 810, reference electrode 820, and working electrode 830 can be electrically connected to the electrochemical measuring device 900. In the embodiments provided in this disclosure, the electrochemical measuring device 900 can be a measuring device used in electrochemical research in related technologies. The specific working principles and structures of the three-electrode system 800 and the electrochemical measuring device 900 are well known to those skilled in the art and will not be described in detail here. The auxiliary electrode 810 can be spaced apart from the sample 100 within the oxidation pool 300, and the reference electrode 820 and working electrode 830 can be spaced apart within the oxidation pool 300, with the reference electrode 820 and working electrode 830 respectively contacting the sample 100. During the monitoring of hydrogen permeation in sample 100, the auxiliary electrode 810 and the working electrode 830 can form a circuit, allowing current to flow through the working electrode 830 to monitor and measure changes in hydrogen ion concentration in the sample, thereby ensuring the effectiveness of hydrogen permeation monitoring. The reference electrode 820 provides a stable potential reference point, ensuring potential stability during measurement and allowing current changes to be more directly correlated with the electrochemical reaction. In the embodiments provided in this disclosure, the reference electrode 820 can be one of a saturated calomel electrode, a silver electrode, or a silver chloride electrode. By setting up the three-electrode system 800 and the electrochemical measurement device 900 in cooperation, the hydrogen permeation of sample 100 can be monitored in real time, ensuring the accuracy and reliability of the measurement data.

[0023] Through the above technical solution, the hydrogen pipeline 410 passes through the oxidation pool 300 to introduce high-pressure hydrogen into the sample 100, which has a hollow tubular structure, thereby filling the sample 100 with hydrogen. The sample 100, the hydrogen peroxide solution, and the electrochemical measuring device 900 are connected through a three-electrode system 800. This allows for the testing of the material properties of the sample 100 under high-pressure hydrogen conditions while simultaneously obtaining the hydrogen permeation of the sample in real time. This reduces the testing risk while ensuring that the introduced hydrogen capacity meets the testing requirements of the sample 100.

[0024] Reference Figure 1The detection device may also include a sealing valve 110, which can be installed at the end of the sample 100 away from the hydrogen pipeline 410. When the sealing valve 110 is closed, leakage of hydrogen gas into the sample 100 can be effectively prevented, ensuring the accuracy of the sample 100 detection. After the detection is completed, the sealing valve 110 can be opened to release the gas pressure. In related technologies, the pressure of a conventional environmental chamber detection device is 150 MPa. According to the ideal gas equation, the pressure of hydrogen gas released into the oxidation pool 300 by the detection device provided in this disclosure is only 0.2 MPa. Compared with detection devices in related technologies, the detection device provided in this disclosure significantly reduces the sealing force of the loading rod 510 and the axial outward pushing gas force of the loading rod 510, improving the safety and reliability of the detection device during use.

[0025] Reference Figure 1 The two sample clamps 200 can be a first sample clamp 210 and a second sample clamp 220, respectively. The first sample clamp 210 can be fixed to the top wall 310 of the oxidation tank 300. The detection device may also include a loading rod 510 and a force-applying part 520 for outputting loading force. The loading rod 510 can penetrate the bottom wall 320 of the oxidation tank 300 and is configured to reciprocate along its own axis so as to move towards or away from the top wall 310. One end of the loading rod 510 can be connected to the other of the two sample clamps 200, that is, one end of the loading rod 510 can be connected to the second sample clamp 220. The other end of the loading rod 510 can extend out of the oxidation tank 300 and be connected to the force-applying part 520, thereby driving the second sample clamp 220 to move towards or away from the first sample clamp 210. In this disclosure, the detection device may further include a power output rod 530 connected between the loading rod 510 and the force application part 520. The force application part 520 may be a drive motor. The power output rod 530 may be connected between the output end of the drive motor and the loading rod 510 to transmit the output force of the drive motor to the loading rod 510. When the second sample clamp 220 is moved toward the first sample clamp 210, the sample 100 is loaded.

[0026] Reference Figure 1 and Figure 2The oxidation tank 300 has a first through hole 321 on its bottom wall 320. The first through hole 321 can be coaxially arranged with the sample 100. The detection device may also include a sealing plug 600 embedded in the first through hole 321 to seal the first through hole 321 and ensure the sealing performance of the first through hole 321. The sealing plug 600 has a second through hole 610 through which the loading rod 510 passes and extends into the oxidation tank 300. The second through hole 610 can be coaxial with the first through hole 321 so that the movement path of the loading rod 510 coincides with the axis of the sample 100, thereby ensuring the accuracy and stability of the load force transmission. A first sealing element 710 is provided between the second through hole 610 and the loading rod 510 to improve the sealing performance between the loading rod 510 and the bottom wall 320 during movement and further reduce the possibility of hydrogen leakage.

[0027] Reference Figure 1 According to the embodiments provided in this disclosure, a lubricating medium can be coated between the first seal 710 and the loading rod 510 to reduce wear between the loading rod 510 and the sealing plug 600, thereby improving the service life of the loading rod 510 and the sealing plug 600. It should be noted that, since conventional high-pressure hydrogen is directly introduced into the environmental chamber, maintaining the internal pressure of the environmental chamber while ensuring a dynamic seal between the loading rod 510 and the sealing plug 600 is necessary. Coating the loading rod 510 and the sealing plug 600 with a lubricating medium would affect the purity of the hydrogen in the environmental chamber. However, in this disclosure, since the internal space of the sample 100 is effectively isolated from the internal space of the oxidation pool 300, the purity of the hydrogen does not need to be considered when coating the loading rod 510 and the sealing plug 600 with a lubricating medium. This allows for an increase in the loading frequency of the loading rod 510, for example, to 200Hz, significantly shortening the high-cycle fatigue test cycle.

[0028] Reference Figure 2 The inner wall of the second through hole 610 has a first mounting groove 611 for the first seal 710 to be embedded in. This ensures the reliability of the seal between the loading rod 510 and the sealing plug 600, preventing the loading rod 510 from loosening or falling off during use. It also improves the overall performance of the sealing plug 600 and the first seal 710. Furthermore, the embedded installation of the first seal 710 allows for convenient replacement or maintenance. When the first seal 710 is damaged or fails and needs replacement, it can simply be removed from the first mounting groove 611 and a new first seal 710 installed, without replacing the entire sealing plug 600, thus saving time and cost. The specific structure of the first seal 710 is not limited in this disclosure. The first seal 710 can be multiple sealing blocks spaced apart along the axial direction of the loading rod 510, or it can be an annular structure with an inner diameter matching the outer diameter of the loading rod 510.

[0029] Reference Figure 1 and Figure 2 The sealing plug 600 may include a small-diameter section 620 and a large-diameter section 630. The aforementioned second through-hole 610 passes through the small-diameter section 620 and the large-diameter section 630 sequentially from top to bottom. The outer diameter of the small-diameter section 620 may match the inner diameter of the first through-hole 321, and the small-diameter section 620 is sealed within the first through-hole 321 to seal the bottom wall 320, thereby further preventing high-pressure hydrogen from leaking to the outside of the oxidation pool 300. The outer diameter of the large-diameter section 630 may be larger than that of the small-diameter section 620. The large-diameter section 630 may extend out of the first through-hole 321 and be coaxially connected to the lower part of the small-diameter section 620, making it easier to install and remove the sealing plug 600. The top surface of the large-diameter section 630 may be attached to the bottom wall 320, which further improves the sealing effect between the sealing plug 600 and the bottom wall 320, and also ensures the stability and reliability of the sealing plug 600 installation.

[0030] Reference Figure 1 and Figure 2 A second sealing element 720 is provided between the top surface of the large-diameter section 630 and the bottom wall 320, which can effectively prevent the sealing plug 600 from loosening between itself and the bottom wall 320 during use, ensuring the reliability of the sealing of the sealing plug 600. A second mounting groove 631 is provided on the top surface of the large-diameter section 630 for the second sealing element 720 to be embedded, which can ensure the accuracy of the installation of the second sealing element 720 and the stability of its installation position, thereby ensuring the sealing effect. In addition, the embedded installation of the second sealing element 720 allows for convenient replacement or maintenance of the second sealing element 720. When the second sealing element 720 is damaged or fails and needs to be replaced, it can simply be removed from the second mounting groove 631 and a new second sealing element 720 can be installed without replacing the entire sealing plug 600, thus saving time and costs.

[0031] Reference Figure 1 In this disclosure, the hydrogen pipeline 410 can be a telescopic tube capable of extending and retracting along its own axis, allowing it to expand and contract according to the deformation of the sample 100, thus exhibiting strong adaptability. The hydrogen pipeline 410 can be made of a flexible material to better adapt to the space environment, while reducing noise and vibration during hydrogen flow, improving the flexibility and safety of the hydrogen pipeline 410's arrangement. The detection device may also include a regulating valve 430 disposed on the hydrogen pipeline 410 to adjust the hydrogen flow rate and velocity according to detection requirements.

[0032] Reference Figure 1The hydrogen supply unit may include a high-pressure gas tank 420 for supplying high-pressure hydrogen to the hydrogen pipeline. The high-pressure gas tank 420 can be located outside the oxidation tank 300, saving space inside the oxidation tank 300 and making its space utilization more flexible. Furthermore, the high-pressure gas tank 420, being outside the oxidation tank 300, facilitates heat dissipation, reducing temperature rise inside the oxidation tank 300 and helping to maintain temperature stability, thus improving the safety of the detection device during operation. In the event of an accident, the high-pressure gas tank 420 can reduce the impact on the interior of the oxidation tank 300, lowering the risk of an accident.

[0033] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0034] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0035] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A device for detecting the mechanical resistance of a sample in a high-pressure hydrogen environment, characterized in that it comprises: The sample is configured as a hollow tubular structure, and the detection device comprises: two sample clamps respectively clamped at two ends of the sample; an oxidation tank filled with sodium hydroxide solution, the sample clamps and the sample being accommodated in the oxidation tank; a three-electrode system for monitoring the hydrogen permeation amount of the sample, the three-electrode system comprising an auxiliary electrode, a reference electrode and a working electrode accommodated in the oxidation tank and collectively connected to an electrochemical measuring device, wherein the auxiliary electrode is arranged in spaced relation to the sample, and the reference electrode and the working electrode are arranged in spaced relation and abut against the sample; a hydrogen supply part comprising a hydrogen pipeline passing through the oxidation tank and being in gas communication with one end of the sample.

2. The detection device of claim 1, wherein, A sealing valve is further included for being arranged at the end of the sample away from the hydrogen pipeline.

3. The detection device of claim 1, wherein, One of the two sample clamps is fixed to the top wall of the oxidation tank; The detection device further comprises a loading rod and a force applying part for outputting a loading force, wherein the loading rod penetrates through the bottom wall of the oxidation tank and is configured to be capable of reciprocating along its own axis, one end of the loading rod being connected to the other of the two sample clamps, and the other end of the loading rod extending out of the oxidation tank and being connected to the force applying part.

4. The detection device of claim 3, wherein, A first through hole is formed in the bottom wall, and the detection device further comprises a sealing plug sealed at the first through hole, the sealing plug being provided with a second through hole for the loading rod to pass through and extend into the oxidation tank, and a first sealing member being arranged between the second through hole and the loading rod.

5. The detection device of claim 4, wherein, A lubricating medium is coated between the first sealing member and the loading rod.

6. The detection device according to claim 4 or 5, characterized in that A first mounting groove is formed in the inner wall of the second through hole for the first sealing member to be embedded.

7. The detection device of claim 4, wherein, The sealing plug comprises: a small-diameter section having an outer diameter matched with the inner diameter of the first through hole and being sealingly embedded in the first through hole; and a large-diameter section having an outer diameter greater than that of the small-diameter section, the large-diameter section extending out of the first through hole and being coaxially connected to the lower part of the small-diameter section, and the top surface of the large-diameter section being attached to the bottom wall.

8. The detection device of claim 7, wherein, A second sealing member is arranged between the top surface of the large-diameter section and the bottom wall, and a second mounting groove is formed in the top surface of the large-diameter section for the second sealing member to be embedded.

9. The detection device of claim 1, wherein, The hydrogen pipeline is a telescopic tube capable of being telescopically extended along its own axis.

10. The detection device according to claim 1 or 9, characterized in that The hydrogen supply part comprises a high-pressure gas tank arranged outside the oxidation tank for supplying high-pressure hydrogen gas to the hydrogen pipeline.

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