Stress loading device and test system

Abstract

The utility model relates to the technical field of testing, and discloses a stress loading device and a testing system.The stress loading device comprises a clamping assembly and a vibration table, the clamping assembly is connected to the vibration table through a fixing piece and used for abutting against the two sides of a to-be-tested sample through an abutting piece and a supporting piece so that the sample can be kept in a bent state, and the clamping assembly is connected to the vibration table through a clamping piece. On the basis, the vibration table is used for driving the fixed part to vibrate in different vibration modes so as to load a variable vibration load to the sample, so that an alternating load can be applied to the sample in a test process, and the device can be used for verifying the delayed cracking tendency of a part material under a complex working condition; the alternating load of the actual working condition is effectively simulated, the validity of the verification result is improved, and the risk is effectively identified.

Description

Technical Field

[0001] The present application relates to the field of testing technology, and in particular to a stress loading device and a testing system. Background Art

[0002] Related technologies verify delayed cracking in steel, including loading a sample with a set yield stress and observing the cracking behavior after holding it for a certain period of time, or immersing it in a solution for a certain period of time and observing the cracking behavior, thereby evaluating the material's delayed cracking resistance. For parts that must operate under complex operating conditions, these methods struggle to effectively replicate actual operating conditions, resulting in poor validation results and difficulty identifying risks. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a stress loading device that effectively simulates the alternating loads found in actual working conditions. This application also proposes a test system incorporating this stress loading device, which can enhance the validity of the test results.

[0004] In the first aspect, the stress loading device of the embodiment of the present application includes a clamping assembly and a vibration table, the clamping assembly includes a fixing part, a support part and two groups of abutment parts, the two groups of abutment parts are arranged at intervals along a first direction and are connected to the fixing part, the support part is arranged on one side of the spacing area between the two groups of abutment parts along a second direction and is connected to the fixing part, the abutment part and the support part are respectively used to abut against the two side surfaces of the test sample along the second direction to keep the sample in a stress-loaded state; the second direction intersects with the first direction; the vibration table has at least two different vibration modes, the fixing part is connected to the vibration table, and the vibration table is used to drive the fixing part to vibrate under different vibration modes to load changing vibration loads to the sample.

[0005] The stress loading device according to the embodiment of the present application has at least the following beneficial effects: when used, the abutment members and the support members respectively abut against the two side surfaces of the test sample along the second direction to keep the sample in a stress-loaded state, and the vibration table applies a changing vibration load to the sample in the stress-loaded state by changing different vibration modes, thereby applying an alternating load to the sample during the test, which can be used to verify the delayed cracking tendency of parts materials under complex working conditions, effectively simulate the alternating loads of actual working conditions, improve the validity of the verification results, and thus effectively identify risks.

[0006] According to the stress loading device of some embodiments of the present application, the support member can move relative to the fixing member along the second direction, so as to load a prestress with a variable value onto the specimen.

[0007] According to the stress loading device of some embodiments of the present application, the abutment member includes a connecting portion and a first abutment shaft, the connecting portion is connected to the fixing member, the first abutment shaft is rotatably connected to the connecting portion and is located on a side of the connecting portion facing the support member, and the outer peripheral wall of the first abutment shaft is used to abut a side surface of the sample facing away from the support member along the second direction;

[0008] And / or, the support member includes a support portion and a second abutment shaft, the support portion can move relative to the fixing member, the second abutment shaft is rotatably connected to the support portion and is located on the side of the support portion facing the spacing area, and the outer peripheral wall of the second abutment shaft is used to abut the side surface of the sample along the second direction away from the abutment member.

[0009] According to the stress loading device of some embodiments of the present application, the support member includes two groups of second abutment shafts spaced apart along the first direction, and the spacing between the two groups of second abutment shafts is smaller than the spacing between the two groups of abutment members.

[0010] According to the stress loading device of some embodiments of the present application, the vibration table is provided with a mounting position, and the fixing member is detachably connected to the mounting position.

[0011] Secondly, the test system of the embodiments of the present application includes the aforementioned stress loading device. The test system is used to verify the delayed cracking tendency. During the test, the stress loading device can apply alternating loads to the specimen, effectively simulating the alternating loads in actual working conditions, improving the validity of the verification results and effectively identifying risks.

[0012] According to some embodiments of the present application, the test system further includes:

[0013] A chassis, wherein the chassis has an accommodating cavity inside, and the stress loading device is located in the accommodating cavity;

[0014] and at least one of a salt spray device, a temperature control device, and a monitoring device, wherein the salt spray device is used to input salt spray into the accommodating chamber, the temperature control device is used to heat or cool the air in the accommodating chamber, and the monitoring device is used to collect a surface image of the sample during the test.

[0015] According to the test system of some embodiments of the present application, the salt spray device includes a conveying member and a nozzle arranged in the accommodating chamber, the conveying member is connected to the chassis and is located on the side of the clamping assembly away from the vibration table, a conveying channel is provided inside the conveying member, the nozzle is connected to the conveying member, the internal channel of the nozzle is connected to the conveying channel, and the nozzle is used to spray salt spray into the accommodating chamber.

[0016] According to the test system of some embodiments of the present application, the salt spray device further includes a rotating mechanism and / or a lifting mechanism, wherein the rotating mechanism is connected to the conveying member and is used to drive the conveying member to rotate to adjust the spray angle of the nozzle; the lifting mechanism is connected to the conveying member and is used to drive the conveying member to rise and fall to adjust the relative distance between the nozzle and the vibration table.

[0017] According to the test system of some embodiments of the present application, the temperature control device includes a temperature controller, a heating device and a cooling device. The heating device is used to provide heat to the accommodating chamber so that the sample is tested at a first temperature; the cooling device is used to provide cold air to the accommodating chamber so that the sample is tested at a second temperature, and the second temperature is lower than the first temperature. The temperature controller is communicatively connected to the heating device and the cooling device, and is used to control the start and stop and operating temperature of the heating device and the cooling device according to a set timing.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a stress loading device according to an embodiment of the present application;

[0020] Figure 2 A schematic structural diagram of a clamping assembly in a stress loading device according to an embodiment of the present application

[0021] Figure 3 A schematic structural diagram of a test system according to an embodiment of the present application;

[0022] Figure 4 This is a schematic structural diagram of a test system according to another embodiment of the present application.

[0023] Reference numerals:

[0024] Vibration table 100;

[0025] Clamping assembly 200; fixing member 210; base 211; bracket 212; support member 220; support portion 221; second abutting shaft 222; support platform 223; abutting member 230; connecting portion 231; first abutting shaft 232; spacing area 233; fastener 240;

[0026] Chassis 300; accommodating cavity 310; cooling air inlet 320;

[0027] Salt spray device 400; conveying member 410; nozzle 420;

[0028] Heating device 510; Temperature measuring device 520;

[0029] Monitoring device 600;

[0030] Sample 700. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the concept and technical effects of this application in conjunction with the embodiments to fully understand the purpose, features and effects of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of this application.

[0032] In the description of the embodiments of the present application, if orientation descriptions are involved, the orientations or positional relationships indicated by "up", "down", "front", "back", "left", "right", etc. are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present application.

[0033] In the description of the embodiments of the present application, if a certain feature is referred to as being “set,” “fixed,” “connected,” or “installed” on another feature, it may be directly set, fixed, or connected on the other feature, or it may be indirectly set, fixed, connected, or installed on the other feature. In the description of the embodiments of the present application, if “several” is involved, it means more than one; if “multiple” is involved, it means more than two; if “greater than,” “less than,” or “exceeds” is involved, it should be understood as not including the number itself; if “above,” “below,” or “within” is involved, it should be understood as including the number itself. If “first” or “second” is involved, it should be understood as being used to distinguish technical features, and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] Delayed cracking refers to the phenomenon that the material cracks after a period of stress. The cracks do not appear immediately after the load is applied, but will appear after a period of time (several hours, days or even longer).

[0035] In related technologies, measuring the stress properties of materials through delayed cracking tests helps understand their cracking tendency under specific conditions. A common method is to load a material sample with a set yield stress and maintain it for a certain period of time, or to soak it in a solution environment for a certain period of time and then observe the cracking of the sample. This method has a single stress pattern for the sample and cannot verify the impact of alternating loads on the material. Therefore, for parts that are subject to alternating loads during some applications, such as vehicle parts that are subjected to alternating loads such as tension, compression, and impact during actual driving after being installed on the vehicle, the above method is difficult to effectively reproduce actual working conditions, so the verification results are less effective and it is difficult to effectively identify risks.

[0036] The present invention provides a stress loading device and a test system having the stress loading device. The stress loading device effectively simulates the alternating load of actual working conditions, thereby improving the validity of the verification results and effectively identifying risks.

[0037] The following describes the embodiments of the present application in conjunction with the accompanying drawings.

[0038] refer to Figure 1 The stress loading device of the embodiment of the present application is used for delayed cracking testing of materials, applying an alternating load to a specimen 700. The stress loading device includes a clamping assembly 200 and a vibration table 100. The clamping assembly 200 is used to secure the specimen 700 to be tested, and the vibration table 100 is used to vibrate the specimen 700 via the clamping assembly 200.

[0039] refer to Figure 1 and Figure 2 The clamping assembly 200 includes a fixing member 210, a supporting member 220, and two sets of abutting members 230. The two sets of abutting members 230 are respectively connected to the fixing member 210 and are spaced apart along a first direction, thereby forming a spacing region 233 between the two sets of abutting members 230. The supporting member 220 is disposed on one side of the spacing region 233 between the two sets of abutting members 230 along a second direction intersecting the first direction and connected to the fixing member 210.

[0040] Therefore, the abutment 230 and the support member 220 are respectively used to abut against the two side surfaces of the test sample 700 along the second direction. The support member 220 and the two groups of abutment members 230 can respectively abut against different positions of the sample 700 along the first direction. When used, the support member 220 can support the sample 700 toward the spacing area 233 in a direction intersecting with the arrangement direction of the abutment members 230. The support member 220 has an action force on the sample 700 toward the spacing area 233. The two groups of abutment members 230 have an action force on the parts of the sample 700 located on both sides of the support member 220 along the first direction toward the support member 220. The support member 220 and the abutment member 230 clamp the sample 700 together to keep the sample 700 in a stress-loaded state. For example, the two groups of abutments 230 abut against the surface of the side of the sample 700 facing away from the support member 220 at intervals, and the support member 220 applies a force to the sample 700 toward the spacing area 233 between the two groups of abutments 230, so that the sample 700 can maintain a curved state of being bent and convex toward the spacing area 233. The abutment between the support member 220 and the two groups of abutments 230 can prevent the sample 700 from rebounding, so that the sample 700 is subjected to bending stress and maintains a stress-loaded state.

[0041] The clamping assembly 200 can be connected to the vibration table 100 via the fixing member 210. The vibration table 100 can drive the clamping assembly 200 and the specimen 700 to vibrate. In the embodiment of the present application, the vibration table 100 has at least two different vibration modes. The vibration table 100 can drive the fixing member 210 to vibrate in different vibration modes. By changing the different vibration modes, the vibration table 100 applies varying vibration loads to the specimen 700 maintained in a stress-loaded state. In this way, an alternating load can be applied to the specimen 700 during the test, effectively simulating the alternating loads that relevant components (such as vehicle body components) experience under actual operating conditions. This improves the effectiveness of the verification results of the delayed cracking tendency of component materials, thereby effectively identifying risks.

[0042] In the embodiment of the present application, the vibration table 100 is configured to have different vibration modes by changing the vibration parameters of the vibration table 100, wherein the vibration parameters may include at least one of the vibration frequency, amplitude, and vibration direction. For example, the vibration table 100 may drive the sample 700 to vibrate alternately at different frequencies, wherein the amplitude and vibration direction may be the same or different; or, the vibration table 100 may drive the sample 700 to vibrate alternately at different directions, wherein the amplitude and vibration frequency may be the same or different; or, the vibration table 100 may drive the sample 700 to vibrate alternately at different amplitudes, wherein the vibration frequency and vibration direction may be the same or different.

[0043] In some embodiments, the first direction is perpendicular to the second direction, that is, the support force exerted by the support member 220 on the sample 700 is perpendicular to the arrangement direction of the abutment members 230, making it easier to bend the sample 700 toward the spacing region 233. In specific applications, the first direction can be a vertical direction, and the second direction can be a horizontally extending direction, or the second direction can be a vertical direction, and the first direction can be a horizontally extending direction. In other embodiments, the first and second directions may not be perpendicular, and the support force exerted by the support member 220 on the sample 700 may have a component perpendicular to the arrangement direction of the abutment members 230 and directed toward the spacing region 233, thereby clamping the sample 700 together with the abutment members 230 and applying stress to the sample 700.

[0044] As an example, the fixing member 210 is located above the vibration table 100 and connected to the vibration table 100, two groups of abutment members 230 are arranged at intervals in the horizontal direction to form a spacing area 233, and the support member 220 is arranged on the lower surface of the spacing area 233 in the vertical direction. The abutment member 230 abuts against the upper surface of the sample 700, and the support member 220 abuts against the lower side of the sample and supports the sample 700 upward, so that the sample 700 bends toward the spacing area 233. The sample 700 is clamped between the support member 220 and the abutment member 230 to maintain a bent state.

[0045] The vibration direction of the vibration table 100 can be the same as the first direction, the same as the second direction, or different from the first direction and the second direction. As an example, the vibration table 100 can be arranged in the horizontal direction and the vibration load can be applied in the vertical direction.

[0046] refer to Figure 1 and Figure 2 In some embodiments, the support member 220 can move relative to the fixing member 210 along the second direction. Thus, the specimen 700 can be pushed along the second direction by the movement of the support member 220 relative to the fixing member 210, so as to load a variable value of prestress (stress lower than the material yield strength itself) onto the specimen 700. By adjusting the position of the support member 220 relative to the fixing member 210, the relative position of the support member 220 and the abutment member 230 can be adjusted, thereby changing the value of the prestress loaded onto the specimen 700. For example, increasing the stroke of the support member 220 toward the spacing area 233 of the abutment member 230 along the second direction can increase the prestress loaded onto the specimen 700. Conversely, decreasing the stroke of the support member 220 toward the spacing area 233 of the abutment member 230 along the second direction can reduce the prestress loaded onto the specimen 700.

[0047] During use, the support member 220 can be moved relative to the fixing member 210 to push the specimen 700 in the second direction, applying a stress lower than the material's yield strength to the specimen 700, causing the specimen 700 to elastically deform and bend. After this, the support member 220 is fixed in position, and the clamping assembly 200 and the bent specimen 700 are then loaded onto the vibration table 100. Thus, the clamping assembly 200 can be used not only to clamp the specimen 700 but also to prepare the specimen 700. Once the specimen 700 is prepared, it can be loaded onto the vibration table 100 along with the clamping assembly 200 for testing, without having to remove it or use another fixture for fixation.

[0048] During specific implementation, the clamping assembly 200 can be used to first clamp the sample 700 between the abutment and the support member 220, and then the fixing member 210 can be loaded onto the tensile testing machine. The tensile testing machine drives the support member 220 to move and press the sample 700, applying a constant stress lower than the yield strength of the material itself to the sample 700, so that the sample 700 tends to bend toward the spacing area 233 between the two groups of abutment members 230. After the sample 700 undergoes elastic deformation and bends, the position of the support member 220 is fixed, the clamping assembly 200 with the bent sample 700 is taken out, and the clamping assembly 200 together with the bent sample 700 is loaded onto the vibration table 100 for testing. This not only facilitates the preparation of the sample 700, but also does not change the bending effect of the sample 700 after preparation, thereby avoiding the sample 700 from rebounding and deviating from the set stress value.

[0049] Alternatively, a tensile testing machine may be used to apply a constant stress lower than the yield strength of the material to the sample 700, so that the sample 700 is bent and then fixed and maintained in the bent shape by the clamping assembly 200. The clamping assembly 200 and the bent sample 700 are then loaded onto the vibration table 100 for testing. In this embodiment, the support member 220 can be movably connected to the fixing member 210 along the second direction, which can facilitate adjustment of the position of the support member 220 when clamping the sample to ensure a tight clamping. Alternatively, instead of adopting this movable connection method, the support member 220 can be detachably connected to the fixing member 210, so that it can be connected and fixed to the fixing member 210 after the sample 700 is bent.

[0050] The support member 220 can be movably connected to the fixing member 210 in a variety of ways. As an example, the support member 220 can be connected to the fixing member 210 by a threaded connection. For example, the fixing member 210 is provided with a threaded hole passing through along the second direction, and a portion of the support member 220 is made into a screw structure, which is connected to the threaded hole through the screw, so that the support member 220 can be rotated to achieve movement along the second direction relative to the fixing member 210.

[0051] Alternatively, in some other examples, the support member 220 is slidably connected to the fixing member 210, and the support member 220 is further provided with a locking member for locking the support member 220 to fix the relative positions of the support member 220 and the fixing member 210. For example, the fixing member 210 is provided with a guide groove extending along the second direction and a screw hole connected to the guide groove along a third direction, and the third direction is perpendicular to the first direction and the second direction; the support member 220 is slidably provided in the guide groove, and the locking member is threadedly connected and passed through the screw hole, and one end of the locking member abuts against the support member 220 to thereby limit the movement of the support member 220. The support member 220 can be unlocked by rotating the locking member so that it partially withdraws from the screw hole and disengages from the abutment against the support member 220.

[0052] refer to Figure 1 and Figure 2 In some embodiments, the abutment 230 may include a connecting portion 231 and a first abutment shaft 232, the connecting portion 231 is connected to the fixing member 210, the first abutment shaft 232 is connected to the connecting portion 231, and the first abutment shaft 232 is located on the side of the connecting portion 231 facing the support member 220, thereby forming a structure that is protruding relative to the connecting portion 231 toward the support member 220, and the outer peripheral wall of the first abutment shaft 232 is used to abut against the side surface of the sample 700 away from the support member 220 along the second direction, which can facilitate the support member 220 to load stress on the sample 700 toward the spacing area 233, and the two first abutment shafts 232 make it easy for the two ends of the sample 700 along the first direction to bend and deform from both sides of the support member 220. As an example, the first abutting shaft 232 extends along a third direction, which is perpendicular to the first and second directions. Therefore, on the orthographic projection of the plane containing the first and second directions, the outer wall of the first abutting shaft 232 extending along the third direction abuts against the same position of the specimen 700, thereby ensuring that the specimen 700 is evenly stressed. As another example, in a solution where the extension direction of the first abutting shaft 232 is not perpendicular to the first and second directions, that is, the extension direction of the first abutting shaft 232 is inclined at a set angle relative to the third direction, the outer wall of the first abutting shaft 232 can still effectively abut the specimen 700 when stress is applied to the support member 220.

[0053] The first abutting shaft 232 is rotatably connected to the connecting portion 231. Therefore, when the abutting member 230 presses against the specimen 700 via the first abutting shaft 232, the rotation of the first abutting shaft 232 prevents damage to the surface of the specimen 700. In practice, as the support member 220 presses against the specimen 700 to bend it, the specimen 700 bends toward the spacing region 233 between the two sets of abutting members 230. As the shape of the specimen 700 changes, the first abutting shafts 232 on both sides can press against the surface of the specimen 700 while rolling, adaptively changing their abutting positions and applying load to the corresponding positions, allowing the specimen 700 to bend and deform smoothly. This effectively prevents surface damage to the specimen 700, which could affect the accuracy of the cracking test results. During the test, as vibration progresses and under the action of alternating loads, the first abutting shafts 232 effectively prevent wear at the abutting positions.

[0054] refer to Figure 1 and Figure 2 In some embodiments, the support member 220 may include a support portion 221 and a second abutment shaft 222. The support portion 221 may move relative to the fixing member 210 along the second direction. The second abutment shaft 222 is located on the side of the support portion 221 facing the spacing area 233 and is connected to the support portion 221. Thus, a structure that is protruding relative to the support portion 221 toward the spacing area 233 can be formed. The outer peripheral wall of the second abutment shaft 222 is used to abut against the surface of the sample 700 that is away from the abutment member 230 along the second direction, which can facilitate the loading of stress on the sample 700 so that the sample 700 is easily bent and deformed toward the spacing area 233 between the two groups of abutment members 230.

[0055] As an example, the second abutting shaft 222 extends along a third direction, which is perpendicular to the first and second directions. Therefore, on the orthographic projection of the plane containing the first and second directions, the outer wall of the second abutting shaft 222 extending along the third direction abuts against the same position of the specimen 700, thereby ensuring that the specimen 700 is evenly stressed. As another example, in a solution where the extension direction of the second abutting shaft 222 is not perpendicular to the first and second directions, that is, the extension direction of the second abutting shaft 222 is inclined at a set angle relative to the third direction, the outer wall of the second abutting shaft 222 can still effectively abut the specimen 700 when stress is applied to the support member 220.

[0056] The second abutting shaft 222 is rotatably connected to the supporting portion 221 . Therefore, when the supporting portion 221 presses the sample 700 via the second abutting shaft 222 , the second abutting shaft 222 can rotate to avoid damaging the surface of the sample 700 .

[0057] During use, as the support member 220 is driven to press against the specimen 700 to bend it, the second abutment shaft 222 can roll along the surface of the specimen 700 and adaptively change its abutment position as the specimen 700 changes shape, allowing the specimen 700 to bend and deform smoothly while effectively preventing surface damage to the specimen 700 that could affect the accuracy of the cracking test results. During the test, as vibration progresses and under the action of alternating loads, the second abutment shaft 222 can effectively prevent wear at the abutment position.

[0058] refer to Figure 1 and Figure 2 In some embodiments, the support member 220 includes two sets of second abutting shafts 222 spaced apart along the first direction. The two sets of second abutting shafts 222 jointly press against the sample 700, thereby avoiding the problem of bending the sample 700 to form sharp corners caused by single-point pressure. Specifically, the support member 220 may further include a support platform 223 connected to one end of the support portion 221 facing the spacing region 233. The size of the support platform 223 along the first direction is larger than the size of the support portion 221 and smaller than the spacing between the two sets of abutting members 230. The two sets of second abutting shafts 222 are spaced apart along the first direction on the support platform 223. Thus, the support portion 221 drives the support platform 223 to drive the two sets of second abutting shafts 222 against the sample 700. The spacing between the two sets of second abutting shafts 222 is smaller than the spacing between the two sets of abutting members 230, thereby preventing interference between the second abutting shafts 222 and the abutting members 230. In the solution where the two groups of abutting members 230 are respectively provided with the above-mentioned first abutting shafts 232 , the distance between the two groups of second abutting shafts 222 is smaller than the distance between the two groups of first abutting shafts 232 , thereby avoiding interference between the second abutting shafts 222 and the first abutting shafts 232 .

[0059] In some embodiments, the clamping assembly 200 may be provided with only the first abutment shaft 232, or only the second abutment shaft 222, or both the first abutment shaft 232 and the second abutment shaft 222, so that the bending of the sample 700 is smoother and both side surfaces of the sample 700 are effectively protected.

[0060] In specific applications, the length of the first abutting axis 232 and / or the second abutting axis 222 along the third direction can be appropriately configured based on actual application requirements. This length can be less than the dimension of the specimen 700 along the third direction, or greater than or equal to the dimension of the specimen 700 along the third direction. Preferably, the length of the first abutting axis 232 and / or the second abutting axis 222 along the third direction is greater than or equal to the dimension of the specimen 700 along the third direction. This can facilitate uniform deformation of the specimen 700, avoid localized deformation of the specimen 700 caused by localized pressure on the surface of the specimen 700 in the third direction, and reduce the impact on the validity of the test results.

[0061] In some embodiments, the vibration table 100 is provided with a mounting position, and the fixing member 210 is detachably connected to the mounting position to facilitate the preparation and loading of the sample 700 .

[0062] As an example, the vibration table 100 has a platform along the horizontal direction, and a mounting position is provided on the upper side along the vertical direction. The fixing member 210 and the mounting position can be connected using a threaded fastener 240. For example, the mounting position can include a plurality of mounting holes, and the fixing member 210 is detachably connected by threading the fastener 240 with the mounting holes. Alternatively, in another example, the mounting position can include a boss and a locking member. The boss is connected to one side of the vibration table 100 along the second direction and is arranged to protrude relative to the surface of the vibration table 100. One of the boss and the fixing member 210 is provided with a limiting groove extending along the first direction (or the second direction), such as a T-slot or a dovetail groove, and the other is provided with a limiting rib that cooperates with the limiting groove. The rib can slide from one end of the limiting groove into the limiting groove to limit the movement of both in the second direction. The locking member is inserted into the limiting groove and abuts the end of the rib to achieve the limitation of the movement direction. During use, the clamping assembly 200 can be disassembled from the mounting position, fixed to obtain the bent sample 700, and then connected to the mounting position, thereby loading the required sample 700 onto the vibration table 100.

[0063] Specifically, the number of installation positions can be one, two or more than two. Increasing the number of installation positions can expand the number of samples 700 tested at the same time, so that the data obtained from the samples 700 obtained by different treatment methods under the same test conditions can be compared, or the data obtained from the samples 700 obtained by the same treatment method under different test conditions can be compared, and the data obtained from the samples 700 obtained by the same treatment method under the same test conditions can be compared. Comparative analysis can help to obtain verification results efficiently and accurately.

[0064] The vibration table 100 is a test device used to simulate the vibration environment effects of actual working conditions in a test room. The vibration table 100 of the embodiment of the present application can adopt a unidirectional vibration table, for example, a vibration table 100 with a vertical vibration function or a vibration table with a horizontal vibration function. The control system can change the frequency or amplitude of the vibration or change the frequency and amplitude simultaneously, so that the vibration table 100 can have at least two vibration modes.

[0065] Alternatively, in some embodiments, the vibration table 100 may adopt a bidirectional vibration table, such as a vibration table with vertical and horizontal vibration functions, or a vibration table with a degree of freedom vibration function, that is, it can vibrate simultaneously or independently in multiple directions. The control system can accurately adjust at least one of the vibration frequency, amplitude, and vibration direction of the vibration so that the vibration table 100 has at least two vibration modes, thereby further increasing the vibration modes of the vibration table 100. By switching different vibration modes to simulate the actual working condition vibration environment, it is beneficial to improve the accuracy of the alternating load simulating the actual working condition.

[0066] In some embodiments, the vibration table 100 adopts a swept frequency vibration method, so that the vibration table 100 vibrates back and forth between at least two different vibration frequencies. The swept frequency vibration can perform vibration testing by continuously changing but uninterrupted frequencies, and can quickly cover the required frequency range, thereby completing the test task in a shorter time, which can effectively shorten the test cycle.

[0067] In some embodiments, the surface of the vibration table 100 on one side for connecting to the fixing member 210 is treated with anti-corrosion, for example, an anti-corrosion coating is attached, or an anti-corrosion film is adhered, or a layer made of anti-corrosion material is fixedly connected, which can effectively reduce the corrosion of the surface of the vibration table 100.

[0068] refer to Figure 1 and Figure 2 In some embodiments, the fixing member 210 includes a base 211 and two groups of brackets 212 arranged at intervals along the first direction. The brackets 212 extend along the second direction. The base 211 is connected to one end of the two groups of brackets 212. The other ends of the two groups of brackets 212 are respectively connected to an abutment 230. The support member 220 is movably connected to the base 211 along the second direction. Therefore, after the base 211 is installed on the vibration table 100, there is a gap between the abutment 230 and the vibration table 100 along the second direction. The support member 220 can be arranged between the abutment 230 and the vibration table 100, pressing the sample 700 toward the side away from the vibration table 100, so that the convex arc surface formed by the bending of the sample 700 faces the side away from the vibration table 100, which can facilitate the observation or collection of the cracking condition of the surface and the application of test conditions such as salt spray and light to the surface.

[0069] refer to Figure 2 and Figure 3 The present application also provides a test system comprising the aforementioned stress loading device. The test system is used to verify delayed cracking tendency. During the test, the stress loading device applies an alternating load to the specimen 700, effectively simulating the alternating loads experienced in actual working conditions. This improves the validity of the verification results and effectively identifies risks.

[0070] The test system may also include a chassis 300, which has a accommodating chamber 310 inside. The stress loading device is located in the accommodating chamber 310. Therefore, the clamping assembly 200 and the sample 700 can be placed in the accommodating chamber 310 for testing, so as to facilitate setting the salt spray environment, test temperature and other test conditions of the sample 700 in the accommodating chamber 310, so that the influence of different test conditions on the toughness of the material can be considered from multiple aspects.

[0071] refer to Figure 3 and Figure 4 In some embodiments, the testing system may further include at least one of a salt spray device 400, a temperature control device, and a monitoring device 600. The salt spray device 400 is used to inject salt spray into the accommodating chamber 310, allowing the specimen 700 to undergo a delayed cracking test in a predetermined salt spray environment. The temperature control device is used to heat or cool the air within the accommodating chamber 310, allowing the specimen 700 to undergo a delayed cracking test in a predetermined temperature environment. The monitoring device 600 is used to capture surface images of the specimen 700 during the test, recording the test progress and facilitating confirmation of cracking and the time when cracking occurs.

[0072] Specifically, in some embodiments, the salt spray device 400 includes a conveying member 410 and a nozzle 420 disposed within the accommodating chamber 310. The conveying member 410 is connected to the chassis 300 and is located on a side of the clamping assembly 200 facing away from the vibration table 100. For example, the clamping assembly 200 may be above the vibration table 100 and connected to the vibration table 110 via the fixing member 210, and the conveying member 410 is disposed above the clamping assembly 200. A conveying channel is defined within the conveying member 410, and the nozzle 420 is connected to the conveying member 410. The internal channel of the nozzle 420 communicates with the conveying channel. The nozzle 420 is used to spray salt spray into the accommodating chamber 310, allowing the specimen 700 to undergo a delayed cracking test in a predetermined salt spray environment. Combined with the alternating load of the stress loading device, the test cycle can be effectively shortened. The alternating load and salt spray environment can effectively simulate the actual operating conditions of the component to verify the delayed cracking tendency, thereby improving the effectiveness of the test.

[0073] The nozzles 420 can be made of a saltwater-resistant material (such as glass or plastic) to prevent corrosion by saltwater, which could affect the spraying effect. The number of nozzles 420 can be one, two, or more, spaced apart along the extension direction of the conveyor 410. The salt spray device 400 can be equipped with a valve that can be adjusted based on the number and size of the specimens 700. This valve can be used to switch some or all of the nozzles 420 on and off, thereby adaptively adjusting the salt spray environment required for the test.

[0074] It can be understood that the specific method of generating liquid spray through the nozzle 420 can refer to the commonly used implementation methods in the field. Its specific structure and principle will not be described in detail. Here, only a brief illustrative introduction is given: the nozzle 420 has a liquid channel and an air flow channel inside, and compressed air and saline solution are introduced through the delivery channel. When the compressed air passes through the nozzle 420, a high-speed airflow is formed. The saline solution is introduced into the nozzle 420 and mixed with the high-speed airflow, forming tiny salt mist particles at the outlet of the nozzle 420, thereby spraying salt mist into the accommodating cavity 310. These salt mist particles can be evenly sprayed onto the sample 700 under the push of compressed air, so that the sample 700 can undergo a delayed cracking test in a salt mist environment.

[0075] The salt spray device 400 may further include a compressed air supplier and a solution storage tank, which introduce compressed air and a salt water solution into the nozzle 420 through the delivery channel (gas delivery channel and liquid delivery channel) of the delivery member 410 .

[0076] The salt spray device 400 may further include a rotating mechanism connected to the conveying member 410 for driving the conveying member 410 to rotate so as to adjust the spray angle of the nozzle 420 and increase the salt spray range.

[0077] The salt spray device 400 may further include a lifting mechanism connected to the conveying member 410 for driving the conveying member 410 to move up and down to adjust the relative distance between the nozzle 420 and the vibration table 100, thereby adjusting the relative distance between the nozzle 420 and the sample 700, changing the spraying distance, and improving the flexibility and applicability of the salt spray spray device.

[0078] In the test system of some embodiments, the salt spray device 400 may include the above-mentioned rotating mechanism and lifting mechanism. The rotating mechanism is connected to the lifting mechanism, and the lifting mechanism is suitable for driving the rotating mechanism and the conveying member 410 to rise and fall together. In this way, the salt spray device 400 can be adjusted to different heights and directions, further improving the spraying range and flexible applicability of the salt spray device.

[0079] refer to Figure 3 and Figure 4In some embodiments of the test system, the temperature control device includes a heating device 510 and a cooling device. The heating device 510 is used to provide heat to the accommodating chamber 310 so that the specimen 700 is tested at the first temperature. The heating device 510 can be an infrared irradiation system, located within the accommodating chamber 310 and fixed to the chassis 300. It heats the air within the accommodating chamber 310 through infrared irradiation and radiates heat to the specimen 700. Alternatively, the heating device 510 can be a high-temperature electric heating wire heating tube, which transfers heat to the air within the accommodating chamber 310 through a thermally conductive material and radiates heat to the specimen 700. The heating device 510 can effectively simulate actual operating temperature environments (e.g., 22°C to 38°C, 38°C to 50°C, 50°C to 55°C, etc.). The heating temperature can be adjusted by a thermostat, thereby providing multiple high-temperature environments with different temperatures for testing.

[0080] The refrigeration device is used to provide cooling to the accommodating chamber 310 so that the specimen 700 can be tested at a second temperature, which is lower than the first temperature. The refrigeration device can include an evaporator. The chassis 300 is provided with a cold air inlet 320. The evaporator uses evaporative condensation to input cold air from the cold air inlet 320 into the accommodating chamber 310, simulating a low-temperature environment (e.g., 0°C to -10°C, -10°C to -20°C, and -10°C to -30°C). The heating temperature can be adjusted by a thermostat, thereby providing multiple low-temperature environments of varying temperatures for testing.

[0081] The heating device 510 and the refrigeration device can be used to perform high and low temperature cycle tests on the sample 700 at different temperatures to consider the effect of ambient temperature on the toughness of the material. Combined with the alternating load action of the stress loading device, the test cycle can be effectively shortened. The alternating load and temperature environment can better simulate the actual operating conditions of the components to verify the delayed cracking tendency, thereby improving the effectiveness of the test.

[0082] The temperature control device may also include a thermostat, which is communicatively connected to the heating device 510 and the refrigeration device, and is used to control the start and stop and operating temperature of the heating device 510 and the refrigeration device according to a set time sequence. For example, the heating device 510 is controlled by the thermostat to run the operating temperatures of T1, T2, and T3 in sequence, and the operating durations of T1, T2, and T3 are t1, t2, and t3 respectively. Then, the refrigeration device is controlled by the thermostat to run the operating temperatures of T4 and T5 in sequence, and the operating durations are t4 and t5 respectively. The thermostat can also control the above-mentioned T1, T2, T3, T4, and T5 operating temperatures and corresponding operating durations of the heating device 510 and the refrigeration device according to other time sequences. It is understandable that the PID temperature controller commonly used in the temperature control system can be used to continuously monitor the temperature changes of the controlled object and adjust the output signal of the controller according to the difference between the set temperature value and the current temperature value, thereby achieving precise temperature control. The thermostat of the embodiment of the present application can use a PID temperature controller to achieve the above-mentioned temperature control and ensure the stability and accuracy of the test temperature.

[0083] refer to Figure 4 In some embodiments of the test system, the temperature control device may further include a temperature measuring device 520. The temperature measuring device 520, such as a temperature sensor, is adapted to be connected to the surface of the sample to detect the surface temperature of the sample, thereby accurately obtaining the actual temperature of the sample 700. This facilitates accurate control of the temperature environment so that the sample 700 is tested at the set test temperature. The temperature measuring device 520 is communicatively connected to a thermostat. The thermostat can control the operating temperature and start and stop of the heating device 510 or the cooling device based on the temperature data collected by the temperature measuring device 520 to ensure that the temperature of the sample 700 is tested at the set test temperature, thereby improving the controllability and effectiveness of the temperature environment simulation.

[0084] In some embodiments, the test system may include the above-mentioned salt spray device 400 and temperature control device, which can reasonably configure the test salt spray environment and test temperature. In combination with the alternating load effect of the stress loading device, the test cycle can be effectively shortened. The changes in the alternating load, salt spray environment, and temperature environment effectively simulate the actual operating conditions of the components to verify the delayed cracking tendency, thereby improving the effectiveness of the test.

[0085] As an example, the test system and stress-applying device of the embodiments of the present application can be applied to delayed cracking verification testing of vehicle body component materials (such as ultra-high-strength steel and thermoformed materials). Ultra-high-strength steel refers to steel with a tensile strength of 1000 MPa or higher. Due to its high strength, high hardness, and good toughness, it is widely used in vehicle body components. However, as the strength increases, the steel's susceptibility to delayed fracture also increases. After being installed on a vehicle, vehicle components are subjected to alternating loads such as tension, compression, and impact during actual driving. During actual vehicle use, changes in ambient temperature also affect the toughness of the material. How to effectively detect and prevent hydrogen-induced delayed fracture in materials such as ultra-high-strength steel and thermoformed steel has always been a key research focus and challenge in related industries. The stress-applying device of the embodiments of the present application can effectively simulate the alternating loads under actual operating conditions, effectively resolving the problem of some current test methods with a single stress model and an inability to effectively replicate the actual operating conditions of the entire vehicle. This improves the effectiveness of the test and reduces the probability of further losses caused by problematic parts after installation. The test system of some embodiments of the present application is equipped with a temperature control device, which can simulate the ambient temperature of the actual operating conditions of the vehicle, consider the impact of temperature on material toughness, and effectively improve the validity of delayed cracking test results.

[0086] The test system of some embodiments of the present application is integrated with a stress applying device, a salt spray device 400, a temperature control device, a monitoring device 600, etc., which can meet the simulation of various complex working conditions such as alternating loads, salt spray, high and low temperatures, etc., can effectively shorten the test cycle, improve the validity of the test results, facilitate the implementation of batch tests, and quickly and accurately complete the delayed cracking verification of ultra-high strength steel and thermoformed materials, which is conducive to the large-scale application of ultra-high strength steel and thermoformed materials in vehicle parts.

[0087] The embodiments of the present application have been described in detail above with reference to the accompanying drawings. However, the present application is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features of the embodiments can be combined with each other unless there is a conflict.

Claims

1. A stress loading device, characterized in that: include: A clamping assembly comprising a fixing member, a supporting member, and two groups of abutting members, wherein the two groups of abutting members are spaced apart along a first direction and connected to the fixing member, and the supporting member is disposed on one side of a spaced area between the two groups of abutting members along a second direction and connected to the fixing member, wherein the abutting member and the supporting member are respectively used to abut against two side surfaces of a test specimen along the second direction to keep the specimen in a stress-loaded state; the second direction intersects the first direction; A vibration table having at least two different vibration modes, the fixing member being connected to the vibration table, and the vibration table being used to drive the fixing member to vibrate in different vibration modes so as to load varying vibration loads onto the sample.

2. The stress loading device according to claim 1, characterized in that: The support member can move relative to the fixing member along the second direction, so as to apply a variable prestress to the specimen.

3. The stress loading device according to claim 2, characterized in that: The abutment member includes a connecting portion and a first abutment shaft, the connecting portion is connected to the fixing member, the first abutment shaft is rotatably connected to the connecting portion and is located on a side of the connecting portion facing the supporting member, and an outer peripheral wall of the first abutment shaft is used to abut a surface of the sample on a side facing away from the supporting member along the second direction; And / or, the support member includes a support portion and a second abutment shaft, the support portion can move relative to the fixing member, the second abutment shaft is rotatably connected to the support portion and is located on the side of the support portion facing the spacing area, and the outer peripheral wall of the second abutment shaft is used to abut the side surface of the sample along the second direction away from the abutment member.

4. The stress loading device according to claim 3, characterized in that: The support member includes two groups of second abutment shafts spaced apart along the first direction, and a distance between the two groups of second abutment shafts is smaller than a distance between the two groups of abutment members.

5. The stress loading device according to claim 1, characterized in that: The vibration table is provided with a mounting position, and the fixing member is detachably connected to the mounting position.

6. The test system is characterized in that The device comprises the stress loading device according to any one of claims 1 to 5.

7. The test system according to claim 6, characterized in that: The test system further comprises: A chassis, wherein the chassis has an accommodating cavity inside, and the stress loading device is located in the accommodating cavity; and at least one of a salt spray device, a temperature control device, and a monitoring device, wherein the salt spray device is used to input salt spray into the accommodating chamber, the temperature control device is used to heat or cool the air in the accommodating chamber, and the monitoring device is used to collect a surface image of the sample during the test.

8. The test system according to claim 7, characterized in that: The salt spray device includes a conveying member and a nozzle arranged in the accommodating chamber. The conveying member is connected to the chassis and is located on the side of the clamping assembly away from the vibration table. A conveying channel is provided inside the conveying member. The nozzle is connected to the conveying member. The internal channel of the nozzle is connected to the conveying member. The nozzle is used to spray salt spray into the accommodating chamber.

9. The test system according to claim 8, characterized in that The salt spray device further includes a rotating mechanism and / or a lifting mechanism. The rotating mechanism is connected to the conveying member and is used to drive the conveying member to rotate to adjust the spray angle of the nozzle; the lifting mechanism is connected to the conveying member and is used to drive the conveying member to rise and fall to adjust the relative distance between the nozzle and the vibration table.

10. The test system according to claim 7, characterized in that: The temperature control device includes a temperature controller, a heating device and a cooling device. The heating device is used to provide heat to the accommodating chamber so that the sample is tested at a first temperature; the cooling device is used to provide cold air to the accommodating chamber so that the sample is tested at a second temperature, and the second temperature is lower than the first temperature. The temperature controller is communicatively connected to the heating device and the cooling device, and is used to control the start and stop and operating temperature of the heating device and the cooling device according to a set timing.

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