A new bolt ear residual strength test device and method

Abstract

The present application belongs to the technical field of structural test mechanics, and particularly relates to a novel bolt ear piece residual strength test device and method. The device comprises a screw rod, a clamping platform, clamping flat plates, a stop block and a connecting clamp block. The screw rod is arranged below the clamping platform and above the connecting clamp block. Two clamping flat plates are arranged on the clamping platform and fixed in the connecting clamp block. Experimental screw holes are arranged on the clamping flat plates and the clamping platform. A stop block mounting hole is arranged on the clamping platform, and the stop block is mounted on the clamping platform through bolts. The device is simple and reliable in structure, convenient to use, and has universality for various bolt ear piece strength tests.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of structural test mechanics, and particularly relates to a novel bolt lug residual strength test device and method. BACKGROUND

[0002] Lug connection is a widely used connection structure on aircraft, which is usually used in cooperation with bolts to achieve firm connection between parts. However, due to the stress concentration effect around the lug bolt hole, fatigue cracks or even fractures are prone to occur near the bolt hole during long-term use of the aircraft, especially under the action of frequent take-off, landing and vibration in flight, which not only affects the overall integrity and safety of the structure, but also may cause serious flight accidents. Therefore, the strength research of bolt connection lug, especially the evaluation of its residual strength, has become an important research topic in the field of structural mechanics.

[0003] In actual engineering applications, the loading direction of many bolt lugs is not perpendicular to the bolt hole, which brings challenges to the residual strength test. The traditional test method can only apply load in the direction perpendicular to the bolt hole, and cannot truly reflect the stress condition under actual working conditions. In addition, different types of bolts (such as explosive bolts, auxiliary bolts and ordinary bolts) require different clamping devices in the test, which further increases the complexity and cost of the test. The conventional residual strength test scheme can usually only test specific types of bolt lugs, and lacks universality and flexibility, which is difficult to meet the diversified test requirements. SUMMARY

[0004] The technical problem to be solved by the present application is that the traditional test method can only apply load in the direction perpendicular to the bolt hole, and cannot truly reflect the stress condition under actual working conditions in the prior art.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is:

[0006] A novel bolt lug residual strength test device, comprising a screw rod, a clamping platform, a clamping flat plate, a stop block and a connecting clamp block; the screw rod is arranged below the clamping platform and above the connecting clamp block, two clamping flat plates are arranged on the clamping platform, the two clamping flat plates are fixed in the connecting clamp block, experimental screw holes are arranged on the clamping flat plate and the clamping platform, a stop block mounting hole is arranged on the clamping platform, and the stop block is mounted on the clamping platform through bolts.

[0007] By adopting the technical scheme, the device can be applied to residual strength tests of various bolt ear pieces by replacing different blocks, has high universality and flexibility, the design of the inclined five-prism clamping platform enables the vertical load provided by the testing machine to be converted into the inclined load required by the test piece, more truly simulates the stress condition under actual working conditions, the design of the clamping platform and the clamping flat plate considers the convenience of actual operation, for example, the hollow design facilitates the installation and inspection of the bolt, the strain gauge wire can be led out from the hollow part to avoid data interference, the design of the three-step clamping flat plate can prevent the bolt from being excessively tightened to cause additional compression to the test piece, and ensures the stability of the test piece in the loading process, through the accurate clamping and loading mode, the device can provide reliable test data, provides a scientific basis for the strength research of the bolt ear piece, and has wide application prospects.

[0008] Further, the front end of the clamping platform is a mounting surface, and the rear end is a vertical surface, the mounting surface and the horizontal surface form an angle of 0°-45°, the mounting surface and the vertical surface are hollow, and the mounting surface has six block mounting holes on the left and right sides.

[0009] By adopting the above technical scheme, the vertical load provided by the testing machine can be converted into the inclined load required by the test piece by adjusting the angle of the mounting surface. This not only simulates various stress conditions under actual working conditions, but also ensures the accuracy and reliability of the test results. For bolt ear pieces with different stress directions, accurate loading tests can be performed by adjusting the angle of the mounting surface. The hollow design between the mounting surface and the vertical surface provides sufficient space for the installation and inspection of the connecting bolt. At the same time, the strain gauge and its wire can be led out from the hollow part to avoid the problem of inaccurate data caused by the wire being pressed, simplifying the test operation process. The mounting surface has six block mounting holes on the left and right sides. This design allows the installation of different types of blocks (such as arch bridge type cover plates and rectangular flat block), to adapt to the test requirements of different types of bolt ear pieces. This greatly improves the universality and flexibility of the device, reduces the frequency and cost of replacing the test device. The combination of the front mounting surface and the rear vertical surface ensures the stability of the device and provides good support during the test process to prevent the test piece from moving or deforming during the loading process. The design of the vertical surface helps to maintain the overall rigidity of the device and ensures the stability during the test process. By adjusting the angle of the mounting surface, the stress direction of the test piece can be accurately controlled to ensure the accuracy and consistency of the test data. This is very important for scientific research and engineering applications.

[0010] Further, the clamping plate comprises a clamping plate one and a clamping plate two, the surface of the clamping plate one and the clamping plate two is provided with six rows of bolt holes, the top of the clamping plate one and the clamping plate two is provided with corresponding pin shaft holes, the clamping plate one is a cuboid, the thickness of the clamping plate two increases by 10-20mm every two rows of bolt holes, and the clamping plate two is in a stepped type.

[0011] By adopting the above technical scheme, the surface of the clamping plate one and the clamping plate two is provided with six rows of bolt holes, which can adapt to test pieces of different sizes and shapes. This makes the device have high universality and can meet the test needs of various bolt lugs. The thickness of the clamping plate two increases by 10-20mm every two rows of bolt holes, and the clamping plate two is in a stepped type. This design can prevent excessive compression of the test piece when tightening the bolt, ensure that the deformation and stress state of the test piece during the loading process are consistent with the actual working condition, and the stepped design of the clamping plate two can better adapt to the shape of the test piece and provide more stable clamping effect. Especially during the loading process, this design can reduce the displacement and shaking of the test piece, ensure the accuracy of the test data, the top of the clamping plate one and the clamping plate two is provided with corresponding pin shaft holes, the clamping plate is connected with the chuck on the testing machine through the pin shaft, and the stable transmission of the load is ensured. This design simplifies the installation and disassembly process and improves the efficiency of the test. The test piece is firmly fixed on the clamping plate through the six rows of bolt holes, and the uniform distribution of the load on the test piece is ensured. This helps to avoid local stress concentration and ensure the reliability of the test results. The stepped design of the clamping plate two can better match the shape of the test piece and reduce errors caused by improper clamping. This helps to improve the accuracy and repeatability of the test.

[0012] Further, the stopper comprises an arch bridge cover plate stopper and a flat plate stopper, the left and right sides of the arch bridge cover plate stopper each have one column of three bolt holes corresponding to the position of the stopper mounting hole outside the clamping platform, and the middle part of the arch bridge cover plate stopper is provided with a test piece connecting hole; the left and right sides of the flat plate stopper each have one column of three bolt holes corresponding to the position of the stopper mounting hole inside the clamping platform, and the middle part of the flat plate stopper is also provided with a test piece connecting hole.

[0013] By adopting the technical scheme, the arch bridge type design can better adapt to the shape of the explosive bolt lug, ensure the stability and reliability of the test piece in the loading process, and be suitable for auxiliary bolt and ordinary bolt lug test. The flat plate design is simple, suitable for test requirements of various common bolt lugs, the bolt holes of the arch bridge cover plate block and the flat plate block correspond to the block mounting hole positions of the clamping platform, so that the block can be firmly fixed on the clamping platform to prevent loosening during the test, the test piece connecting hole in the middle can accurately fix the test piece on the block to ensure the positioning accuracy of the test piece in the loading process, the arch bridge cover plate block and the flat plate block are fixed on the clamping platform by bolts, the blocks can be quickly replaced according to the test requirements, and the flexibility and efficiency of the test are improved, the bolt connection mode makes the installation and dismounting of the block very convenient, simplifies the test operation process, the arch bridge type design can provide better support, reduce the deformation and displacement of the test piece in the loading process, and ensure the accuracy of the test data, the flat plate design is simple and reliable, can provide stable clamping effect, and ensures the stability of the test piece in the loading process. The design of the test piece connecting hole ensures the positioning accuracy of the test piece, avoids test errors caused by inaccurate positioning, and improves the reliability of the test data.

[0014] The application also includes a novel bolt lug residual strength test method, which tests the residual strength of the bolt lug by using the novel bolt lug residual strength test device. The lug part of the test piece is tightly attached to the mounting surface of the clamping platform, so that the non-lug part of the test piece is perpendicular to the ground, the wire corresponding to the back surface strain gauge of the test piece extends from the hollow part of the clamping platform and is connected to the strain box; the arch bridge cover plate block or the flat plate block is connected to the lug of the test piece, so that the bolt hole of the arch bridge cover plate block or the flat plate block corresponds to the block mounting hole position of the mounting surface, the arch bridge cover plate block or the flat plate block is connected to the clamping platform by bolts, the test piece connecting hole on the arch bridge cover plate block or the flat plate block corresponds to the lug bolt hole position, and the lug is connected to the arch bridge cover plate block or the flat plate block (52) by using the hollow part of the clamping platform and bolts.

[0015] By adopting the technical scheme, the included angle between the mounting surface of the clamping platform and the horizontal plane is 0°-45°, the stress condition under actual working condition can be accurately simulated, the accuracy of test results is ensured, the non-ear part of the test piece is perpendicular to the ground, the stress direction of the test piece in the loading process is consistent with the actual working condition, the hollow design of the clamping platform enables the lead wire of the strain gauge to be smoothly led out, and the problem of inaccurate data caused by the lead wire being pressed is avoided, the block is connected with the clamping platform through the bolt, the operation is simple, the installation and disassembly are fast, the test efficiency is improved, the lead wire of the strain gauge on the back surface of the test piece is led out from the hollow part and connected with the strain box, the accurate collection of strain data is ensured, the bolt hole of the block corresponds to the block mounting hole of the clamping platform, the accurate fixation of the test piece is ensured, and the test error caused by improper fixation is avoided, the arch bridge cover block and the flat plate block are respectively suitable for different types of bolt ear test, and have high adaptability and universality.

[0016] Further, the non-ear part of the test piece is covered from the front and back by the clamping plate one and the clamping plate two, the clamping plate one is close to the vertical surface one side of the test piece close to the mounting surface of the clamping platform, the clamping plate two is close to the mounting surface one side of the test piece close to the mounting surface of the clamping platform, the experimental screw hole on the surface of the clamping plate one and the clamping plate two is aligned with the bolt hole on the surface of the test piece, and the clamping plate and the test piece are connected together by using the bolt.

[0017] By adopting the above technical scheme, the experimental screw hole of the clamping plate one and the clamping plate two is aligned with the bolt hole on the surface of the test piece, and the clamping plate is connected with the test piece by using the bolt, so that the test piece can be accurately fixed at multiple points, the displacement and shaking of the test piece during the test process are avoided, the clamping plate one and the clamping plate two cover the non-ear part of the test piece from the front and back, the stability of the test piece in the loading process is ensured, and local uneven stress is prevented, the clamping plate one is close to the vertical surface one side of the test piece close to the mounting surface of the clamping platform, the stress direction of the test piece in the loading process is consistent with the actual working condition, the clamping plate two is close to the mounting surface one side of the test piece close to the mounting surface of the clamping platform, the stress direction of the test piece in the loading process is consistent with the actual working condition, especially when the mounting surface angle is adjusted, the stress condition in different directions can be simulated, the clamping plate is connected with the test piece through the bolt, the operation is simple, the installation and disassembly are fast, and the test efficiency is improved, the experimental screw hole on the surface of the clamping plate one and the clamping plate two is aligned with the bolt hole on the surface of the test piece, the accuracy and reliability of the connection are ensured, and the clamping plate one and the clamping plate two provide good support, and the stability of the test piece in the loading process is ensured.

[0018] Further, the clamping platform is installed on the lower clamp of the test bench through the screw rod, and the upper end of the clamping plate is connected with the upper clamp of the testing machine.

[0019] By adopting the technical scheme, the screw rod installs the clamping platform on the lower chuck of the test bench, and ensures stable transmission of the load. The screw rod connection mode can provide reliable mechanical connection, ensure continuity and stability of the load in the test process, the upper end of the clamping platform is connected with the upper chuck of the testing machine through the bolt hole, and continuity and stability of the load from the upper part of the testing machine to the test piece are ensured. The screw rod connection and the bolt hole design make the installation and dismounting of the clamping platform and the clamping platform very convenient, simplify the test operation process, improve the test efficiency, the screw rod connection mode allows fine adjustment during installation, ensures accurate alignment of the clamping platform, improves the accuracy of the test, and the multi-point fixing design of the screw rod and the bolt hole can effectively disperse and bear the load in the test process, reduces wear and damage of the clamping platform and the clamping platform, prolongs the service life of the device, and the vertical surface and the mounting surface of the clamping platform provide good support, and ensure the stability of the test piece in the loading process.

[0020] Further, strain gauges are pasted on the surface of the test piece, the strain gauges are electrically connected with the test bench, first loaded to 30% of the breaking load at a loading rate of not higher than 2mm / min, then unloaded to 0%, each test piece is pre-tested 2 times, and then the breaking load is increased from 0% to the breaking load at a loading rate of not higher than 2mm / min until the test piece is broken.

[0021] By adopting the technical scheme, first, the strain gauges are pasted on the surface of the test piece, the strain gauges are electrically connected with the test bench, first loaded to 30% of the breaking load at a loading rate of not higher than 2mm / min, then unloaded to 0%, each test piece is pre-tested 2 times, and then the breaking load is increased from 0% to the breaking load at a loading rate of not higher than 2mm / min until the test piece is broken. This step can ensure that the pasting and electrical connection of the strain gauges are correct, avoid data errors caused by strain gauge falling or poor connection, pre-test can exclude elastic deformation and other potential errors of the test piece in the initial stage, ensure the accuracy of the formal test, pre-test can check the running state of the test equipment, ensure the normal work of the equipment in the formal test, load at a loading rate of not higher than 2mm / min, slow loading can avoid impact and transient stress caused by too fast loading, ensure uniform stress of the test piece in the loading process, slow loading can more accurately control the loading rate, ensure the stability and reliability of the test data, gradually increase the breaking load from 0%, and the data change of the strain gauges can be observed in real time during the gradual loading process, abnormal conditions of the test piece can be found in time, and gradual loading can avoid sudden damage of the test piece caused by sudden loading, and ensure the safety of the test personnel and the equipment.

[0022] The present application has the following beneficial effects:

[0023] 1. The present application can accurately simulate the stress condition under actual working condition through the mounting surface of the clamping platform. The ear part of the test piece is in close contact with the mounting surface of the clamping platform, and the non-ear part is perpendicular to the ground, which ensures that the stress direction of the test piece during loading is consistent with the actual working condition, so that the test result is more accurate, and provides a reliable basis for the strength research of the bolt ear;

[0024] 2. The present application pastes strain gauges on the surface of the test piece, and electrically connects them with the test bench, so that the strain change of the test piece during loading can be monitored in real time. The pre-test step (loaded to 30% of the failure load at a loading rate of not higher than 2mm / min, and then unloaded to 0%, each test piece is pre-tested twice) can eliminate the initial error, check the reliability of the strain gauges and connection, and ensure the accuracy of the formal test. The gradual loading (from 0% of the failure load to the failure load until the test piece fails) can observe the strain change, and ensure the stability and reliability of the test data;

[0025] 3. The present application installs the clamping platform on the lower chuck of the test bench through the screw rod, connects the upper end of the clamping plate with the upper chuck of the testing machine through the pin hole, ensures the stable transmission of the load, and covers the non-ear part of the test piece from the front and back sides through clamping plate one and clamping plate two. The multi-point fixing design can effectively disperse and bear the load during the test process, reduce the wear and damage of the device, prolong the service life, the bolt connection mode makes the installation and disassembly convenient, simplifies the test operation process, and improves the test efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the overall structure schematic diagram of the present application;

[0027] Figure 2 It is the front view of the present application;

[0028] Figure 3 It is the left view of the present application;

[0029] Figure 4 It is the rear view of the present application;

[0030] Figure 5 It is the structure schematic diagram of the arch bridge cover plate stop block of the present application;

[0031] Figure 6 It is the structure schematic diagram of the flat plate stop block of the present application;

[0032] Figure 7 It is the installation schematic diagram of the arch bridge cover plate stop block and the explosive bolt ear of the present application;

[0033] Figure 8 It is the installation schematic diagram of the flat plate stop block and the auxiliary bolt ear of the present application;

[0034] Figure 9The installation schematic diagram of the flat block and the common bolt lug of the present application.

[0035] Wherein, 1-clamping platform; 11-mounting surface; 111-block mounting hole; 12-vertical surface; 2-clamping flat plate; 21-clamping flat plate one; 22-clamping flat plate two; 3-connection clamp block; 4-experimental screw hole; 5-block; 51-arch cover block; 52-flat block; 53-test piece connection hole; 6-explosive bolt lug; 7-assistant bolt lug; 8-common bolt lug; 9-screw rod. DETAILED DESCRIPTION

[0036] The present application will be further described below in conjunction with the drawings and specific preferred embodiments.

[0037] In the description of the present application, it should be understood that the terms "left side", "right side", "upper part", "lower part" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and "first", "second" and the like do not represent the importance of the parts, and therefore cannot be understood as a limitation on the present application. The specific dimensions used in the present embodiment are only for the purpose of illustrating the technical scheme and do not limit the protection scope of the present application.

[0038] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, a new bolt ear piece residual strength test device, the screw rod is arranged below the clamping platform 1 and above the connecting clamp block 3, which is used to transmit the tensile load provided by the testing machine, the clamping platform 1 is the core part of the device, the front end is the mounting surface 11, the rear end is the vertical surface 12, the included angle between the mounting surface 11 and the horizontal plane is 45°, the mounting surface 11 is hollow between the mounting surface 11 and the vertical surface 12, and there are six block mounting holes 111 on the left and right sides of the mounting surface 11, the clamping plate 2 includes clamping plate one 21 and clamping plate two 22, which are fixed in the connecting clamp block 3, and six rows of bolt holes are arranged on the surfaces of the clamping plate one 21 and the clamping plate two 22, and corresponding pin hole is arranged on the top. The clamping plate one 21 is a cuboid, the clamping plate two 22 increases in thickness by 10mm-20mm every two rows of bolt holes, and is in a stepped shape, the block 5 includes arch bridge cover plate block 51 and flat plate block 52, there are three bolt holes on the left and right sides of the arch bridge cover plate block 51, which correspond to the positions of the block mounting holes 111 on the outside of the clamping platform 1, and a test piece connecting hole 53 is arranged in the middle, there are three bolt holes on the left and right sides of the flat plate block 52, which correspond to the positions of the block mounting holes 111 on the inside of the clamping platform 1, and a test piece connecting hole 53 is also arranged in the middle, and the connecting clamp block 3 is located above the clamping plate 2;

[0039] The arch bridge cover plate block 51 is in the shape of a cover plate with closed two ends and open front and back, which can better adapt to the shape of the explosive bolt ear piece, there are three bolt holes on the left and right sides of the arch bridge cover plate block 51, which correspond to the positions of the block mounting holes 111 on the outside of the clamping platform 1, and are used to fix the arch bridge cover plate block 51 on the clamping platform 1, a test piece connecting hole 53 is arranged in the middle of the arch bridge cover plate block 51, which is used to connect the ear piece part of the test piece with the block, the arch bridge cover plate block 51 is aligned with the block mounting holes 111 of the clamping platform 1 through the bolt holes on the two sides, the arch bridge cover plate block is fixed on the clamping platform 1 by using the bolt, the ear piece part of the test piece is aligned with the test piece connecting hole 53 in the middle of the arch bridge cover plate block 51, and the ear piece is installed between the arch bridge cover plate block 51 and the mounting surface 11 by using the bolt.

[0040] The flat plate block 52 has three bolt holes on the left and right sides, which correspond to the positions of the block mounting holes 111 on the inside of the clamping platform 1, and a test piece connecting hole 53 is arranged in the middle, and the ear piece is installed above the flat plate block 52.

[0041] As Figure 7 , Figure 8 and Figure 9As shown, a new bolt ear piece residual strength test method, the ear piece part of the test piece is close to the mounting surface 11 of the clamping platform 1, and the non-ear piece part of the test piece is perpendicular to the ground. The wire corresponding to the strain gauge on the back of the test piece is stretched out from the hollow part of the clamping platform (1) and connected to the strain box. The arch bridge cover block 51 or the flat block 52 is connected to the ear piece of the test piece, and the bolt hole of the block corresponds to the block mounting hole 111 of the clamping platform 1. The arch bridge cover block 51 or the flat block 52 is connected with the clamping platform 1 through the bolt. The test piece connecting hole 53 on the arch bridge cover block 51 or the flat block 52 corresponds to the ear piece bolt hole position. The hollow part of the clamping platform 1 is used to connect the ear piece with the arch bridge cover block 51 or the flat block 52 by using the bolt. The non-ear piece part of the test piece is covered from front to back by using the clamping flat plate one 21 and the clamping flat plate two 22. The clamping flat plate one 21 is close to the vertical surface 12 of the test piece close to the clamping platform 1. The clamping flat plate two 22 is close to the mounting surface 11 of the test piece close to the clamping platform 1. The experimental screw hole 4 on the surface of the clamping flat plate one 21 and the test piece surface bolt hole are aligned. The clamping flat plate 2 is connected with the test piece by using the bolt. The clamping platform (1) is installed on the lower clamp of the test bed through the screw rod 9. The upper screw rod 9 is connected with the upper clamp of the testing machine. The strain gauge is pasted on the surface of the test piece. The strain gauge is electrically connected with the test bed. First, load to 30% of the failure load at a loading rate of 2mm / min, then unload to 0%, and then load from 0% of the failure load to the failure load at a loading rate of 2mm / min until the test piece fails.

[0042] As shown in Figure 7 , the specific implementation steps of the explosion bolt ear piece 6 loading test are as follows:

[0043] The ear piece part of the test piece is tightly attached to the mounting surface 11 of the clamping platform 1, so that the non-ear piece part of the test piece is perpendicular to the ground, the wires corresponding to the strain gauges on the back of the test piece are stretched out from the hollow part at the back of the clamping platform 1 and connected to the strain box of the test bench, the arch bridge cover block 51 is placed on the ear piece, so that the bolt hole positions on both sides of the arch bridge cover block 51 correspond to the bolt hole positions on the outer edge of the mounting surface 11, at this time the ear piece should be surrounded between the arch bridge cover block 51 and the mounting surface 11, six bolts are used to connect the arch bridge cover block 51 and the clamping platform 1 through the bolt holes on both sides, the test piece mounting hole 53 of the arch bridge cover block 51 corresponds to the bolt hole position of the ear piece, the explosive bolt ear piece 6 is connected to the arch bridge cover block 51 by using the hollow part at the back of the clamping platform 1, the non-ear piece part of the test piece is covered from the front and back by using the clamping flat plate 2, the clamping flat plate 21 is tightly attached to the side of the test piece close to the vertical surface 12 of the clamping platform 1, the clamping flat plate 22 is tightly attached to the side of the test piece close to the mounting surface 11 of the clamping platform 1, and the thicker side of the clamping flat plate 22 is on the upper side, the thinner side is on the lower side, the flat side faces outward, the upper parts of the clamping flat plate 21 and the clamping flat plate 22 are in contact and connected by the connecting clamp 3, eight bolts are used to connect the bolt holes on both sides of the pin hole of the clamping flat plate 2, the surface bolt holes of the clamping flat plate 2 are aligned with the surface bolt holes of the test piece one by one, 24 bolts are used to connect the clamping flat plate 2 and the test piece through the bolt holes, the device through screw rod 9 is connected to the test bench, pre-test, load to 30% of the failure load at a loading rate of 2mm / min, then unload to zero, each test piece is pre-tested twice, formal test, load from zero at a loading rate of 2mm / min until the test piece fails, after the test is completed, the power is turned off and the laboratory is cleaned up;

[0044] As shown in Figure 8 and Figure 9 , the specific implementation steps of loading the test of the auxiliary bolt ear piece 7 and the ordinary bolt ear piece 8 are as follows:

[0045] Put the flat block 52 on the clamping platform 1 mounting surface 11, so that the flat block 52 both sides bolt hole with the inside bolt hole position corresponding mounting surface 11, using six bolts through both sides bolt hole flat block 52 and clamping platform 1 connection, test piece ear piece part is placed on the flat block 52, auxiliary bolt ear piece 7 and ordinary bolt ear piece 8 bolt hole with the test piece mounting hole 53 in the middle of the flat block 52 alignment, using clamping platform 1 back hollow part, using auxiliary bolt ear piece and flat block 52 connected, using clamping plate 21 and clamping plate 22 from front to back two sides cover test piece non ear piece part, clamping plate 21 and test piece close to clamping platform 1 vertical surface 12, clamping plate 22 and test piece close to clamping platform 1 mounting surface, and the thickness of the thicker side in the upper, the thickness of the thinner side in the lower, the plane side outward, the clamping plate 2 surface middle four column bolt hole with test piece surface bolt hole one to one alignment, using sixteen bolts clamping plate 2 and test piece through bolt hole connection, the device through the screw rod 9 and test bench connection, pre test, with 2mm / min loading rate to 30% failure load, then unload to zero, each test piece pre test 2 times, formal test, according to 2mm / min loading rate from zero load until the test piece failure.

[0046] The preferred embodiments of the application are described in detail above, but the application is not limited to the specific details of the above-described embodiments. Within the technical concept of the application, various equivalent transformations of the technical solutions of the application can be made, and these equivalent transformations all belong to the protection scope of the application.

Claims

1. A new bolt tab residual strength testing device, characterized by: The utility model provides a test fixture, including screw rod (9), clamping platform (1), clamping flat plate (2), stopper (5) and connecting clamp block (3), screw rod (9) sets up in clamping platform (1) below with connecting clamp block (3) top, be provided with two clamping flat plates on clamping platform (1), two clamping flat plates (2) are fixed in connecting clamp block (3) inside, clamping flat plate (2) with clamping platform (1) all are provided with experimental screw hole (4), still be provided with stopper mounting hole (111) on clamping platform (1), stopper is installed clamping platform (1) through bolt, wherein, the clamping platform includes the front end of clamping platform (1) is mounting surface (11) rear end is vertical surface (12), the mounting surface (11) with horizontal plane included angle is 0 DEG-45 DEG, the clamping flat plate (2) includes clamping flat plate one (21) with clamping flat plate two (22), the surface of clamping flat plate one (21) with clamping flat plate two (22) is provided with six rows of bolt holes, the top of clamping flat plate one (21) with clamping flat plate two (22) is provided with corresponding pin shaft hole, clamping flat plate one (21) is cuboid, clamping flat plate two (22) every two rows of bolt hole thickness increases 10mm-20mm, and presents ladder type, the stopper (5) includes arch bridge cover plate stopper (51) and flat plate stopper (52), the left and right sides of arch bridge cover plate stopper (51) each has a three bolt holes with the position correspondence of stopper mounting hole (111) of clamping platform (1) outside, the middle part of arch bridge cover plate stopper (51) is provided with test piece connecting hole (53), the left and right sides of flat plate stopper (52) each has a three bolt holes with the position correspondence of stopper mounting hole (111) of clamping platform (1) inside, the middle of flat plate stopper (52) is also provided with test piece connecting hole (53).

2. The novel bolted ear residual strength test apparatus of claim 1, wherein: The mounting surface (11) and the vertical surface (12) are hollowed out, and each of the left and right sides of the mounting surface (11) has six stopper mounting holes (111).

3. A new bolt tab residual strength test method, comprising the new bolt tab residual strength test device of any one of claims 1-2, characterized in that: The ear part of the test piece is tightly attached to the mounting surface (11) of the clamping platform (1), so that the non-ear part of the test piece is perpendicular to the ground, the wires corresponding to the strain gauges on the back of the test piece extend from the hollow part of the clamping platform (1) and are connected to the strain box, the arch bridge cover plate stopper (51) or the flat plate stopper (52) is connected to the ear of the test piece, so that the bolt holes of the arch bridge cover plate stopper (51) or the flat plate stopper (52) correspond to the position of the stopper mounting hole (111) of the mounting surface (11), the arch bridge cover plate stopper (51) or the flat plate stopper (52) is connected to the clamping platform (1) by bolts, the test piece connecting hole (53) on the arch bridge cover plate stopper (51) or the flat plate stopper (52) corresponds to the position of the ear bolt hole, and the ear is connected to the arch bridge cover plate stopper (51) or the flat plate stopper (52) by using the hollow part of the clamping platform (1) and bolts.

4. The new bolted ear residual strength test method according to claim 3, characterized in that: The clamping plate one (21) and the clamping plate two (22) cover the non-ear part of the test piece from the front and back, the clamping plate one (21) is close to the vertical surface (12) of the test piece on the side close to the clamping platform (1), the clamping plate two (22) is close to the mounting surface (11) of the test piece on the side close to the clamping platform (1), the experimental screw hole (4) on the surface of the clamping plate one (21) and the clamping plate two (22) is aligned with the bolt hole on the surface of the test piece, and the clamping plate and the test piece are connected together by using the bolt.

5. The new bolted flange residual strength test method of claim 3, wherein: The clamping platform (1) is installed on the lower chuck of the test bench through the screw rod (9), and the upper end of the clamping plate is connected with the upper chuck of the testing machine.

6. The new bolted ear residual strength test method according to claim 3, characterized in that: The strain gauge is pasted on the surface of the test piece, the strain gauge is electrically connected with the test bench, the loading rate is not higher than 2mm / min, the loading is 30% of the breaking load, then the loading is unloaded to 0%, each test piece is pre-tested twice, then the breaking load is increased from 0% to the breaking load at a loading rate of not higher than 2mm / min until the test piece is broken.

Images