An electromagnetic impact fatigue testing device

Abstract

The utility model provides an electromagnetic impact fatigue test device, including a support fixture, which is used to fix and install the test piece; an impact mechanism, on which a driving coil, a secondary coil and a punch are installed, and the secondary coil can achieve reciprocating motion under the action of the driving coil and the power supply component, thereby driving the punch to repeatedly impact the test piece on the support fixture to achieve the electromagnetic impact fatigue test process; the power supply component changes the magnetic pole direction of the driving coil by changing the direction of the current, so that the secondary coil produces reciprocating motion under the action of the magnetic field force; the impact mechanism is also equipped with a photoelectric sensor, an acceleration sensor and a pressure sensor. The utility model can adjust the reciprocating motion stroke of the secondary coil (punch), so as to achieve flexible adjustment of the impact energy, and can also record the number of impacts during the impact test, measure the impact force, and collect the impact acceleration of the punch, so as to conveniently record important experimental data during the impact test.

Description

Technical Field

[0001] The utility model belongs to the technical field of impact test and dynamic test, in particular to an electromagnetic impact fatigue test device. Background Art

[0002] Many parts of engineering structures are subjected to repeated impact loads, such as the arresting hooks of carrier-based aircraft, aircraft landing gear, and the recoil devices in artillery and firearms. These structures will eventually fail under repeated impact loads. The failure of materials and structures in this situation is called impact fatigue failure. The fatigue failure characteristics of materials under impact fatigue load and non-impact fatigue load are usually different. The high loading rate during the impact process may cause changes in the yield and ultimate strength of some materials, especially the fracture toughness, which in turn leads to premature failure of engineering components. If the impact fatigue performance is evaluated by the test results of a single impact fracture, the requirements for material toughness are often too high and the evaluation criteria are too conservative; and conventional quasi-static fatigue does not consider the decrease in toughness caused by the strain rate effect, so it is difficult to predict the premature failure of materials caused by impact fatigue. Therefore, the evaluation of impact fatigue performance needs to rely on scientific impact fatigue test results. However, it is precisely because of the complexity of the impact fatigue test process and the description of the impact fatigue performance of materials that there is currently no standard test device to guide the material selection and structural design of components subjected to repeated impact.

[0003] At present, the development of impact fatigue equipment has not yet formed a standard and widespread testing method. Different researchers mostly use different test devices according to their own research needs, and develop and modify different impact test equipment. Although the existing reports mention electromagnetic impact test equipment, this type of equipment only provides the basic conditions for repeated impact tests to meet the experimental needs. It still cannot solve the problem of obtaining experimental data such as impact force, impact acceleration, impact frequency, etc. In addition, it cannot achieve the adjustment of impact force, etc., and thus cannot meet some specific impact test needs. Utility Model Content

[0004] The utility model aims to solve the problems existing in the prior art and provides an electromagnetic impact fatigue testing device, comprising:

[0005] A supporting fixture, which is used to fix and install the test piece;

[0006] An impact mechanism, on which a driving coil, a secondary coil and a punch are installed. The secondary coil can realize reciprocating motion under the action of the driving coil and the power supply assembly, thereby driving the punch to repeatedly impact the test piece on the supporting fixture to realize the electromagnetic impact fatigue test process;

[0007] A power supply assembly, which is used to provide driving force to the impact mechanism and change the magnetic pole direction of the driving coil by changing the direction of the current, so that the secondary coil generates reciprocating motion under the action of the magnetic field force;

[0008] The impact mechanism is also equipped with a photoelectric sensor for detecting the number of punch impacts, an acceleration sensor for detecting the punch impact acceleration, and a pressure sensor for detecting the punch impact force.

[0009] As a further illustration of the present utility model, the device also includes a support base;

[0010] The impact mechanism and the support fixture can be detachably mounted on the support base, and can be moved along the support base and fixed in position, thereby adjusting the gap between the test piece and the punch, and adjusting the reciprocating stroke of the punch.

[0011] As a further illustration of the present utility model, the support fixture comprises a first fixed plate, a first movable plate and a specimen end adjusting screw;

[0012] The first fixed plate is fixed on the supporting base, one end of the specimen end adjusting screw is fixedly connected to the first fixed plate, and the other end passes through the first movable plate and is locked by a matching nut. The side of the first movable plate away from the first fixed plate is used for assembling the specimen, a threaded slide rod is fixed to the lower end of the first movable plate, a specimen end slide groove is provided on the supporting base, the threaded slide rod is inserted into the specimen end slide groove and can slide back and forth along the same, and a nut locking piece for locking its position is connected to the bottom of the threaded slide rod.

[0013] As a further illustration of the present utility model, the impact mechanism includes a second fixed plate, a second movable plate and a loading end adjusting screw;

[0014] The second fixed plate is fixed on the supporting base, one end of the loading end adjusting screw is fixedly connected to the second fixed plate, and the other end passes through the first movable plate and is locked by a matching nut. The side of the second movable plate away from the second fixed plate is used to assemble the punch. A threaded sliding rod is fixed to the lower end of the second movable plate, and a loading end sliding groove is provided on the supporting base. The threaded sliding rod is inserted into the loading end sliding groove and can slide back and forth along the loading end sliding groove, and a nut locking piece for locking its position is connected to the bottom of the threaded sliding rod.

[0015] As a further description of the utility model, the drive coil includes a first drive coil and a second drive coil, and an impact rod is also provided in the impact mechanism, and the impact rod sequentially penetrates and is slidably connected to the second fixed plate, the second drive coil, the first drive coil and the second movable plate, the secondary coil is located in the gap between the first drive coil and the second drive coil, and the secondary coil is fixed on the impact rod, and the punch is fixedly connected to the end of the impact rod that passes through one end of the second movable plate.

[0016] As a further explanation of the utility model, protective plates are fixed on both sides of the first drive coil and the second drive coil, the protective plate close to one end of the second movable plate is fixed to the second movable plate, the protective plate close to one end of the second fixed plate is fixed to the second fixed plate, and the impact rod passes through the protective plate and is slidably connected thereto.

[0017] As a further description of the present invention, a first linear bearing is connected between the impact rod and the second movable plate, and a second linear bearing is connected between the impact rod and the second fixed plate.

[0018] As a further description of the present invention, a photoelectric detection bracket is fixed on a side of the second fixing plate away from the punch, the photoelectric sensor is fixed on the photoelectric detection bracket, and one end of the impact rod passing through the second fixing plate is located below the photoelectric sensor.

[0019] As a further description of the present invention, the acceleration sensor is fixedly mounted on an end of the impact rod away from the punch; and the pressure sensor is fixed between the punch and the impact rod.

[0020] As a further explanation of the present utility model, an H-bridge current commutator is arranged in the power supply assembly, and the H-bridge current commutator can change the direction of the current applied to the first drive coil and the second drive coil, so that the drive coil generates an alternating magnetic field force, the positive pulse voltage generates a repulsive force, and the negative pulse voltage generates an attractive force, and under the action of the repulsive force and the attractive force, the secondary coil and the impact rod reciprocate together.

[0021] Compared with the prior art, the utility model has the following beneficial technical effects:

[0022] The utility model can drive the test piece to move by arranging a movable supporting fixture, so as to achieve the purpose of adjusting the distance between the test piece and the punch; and can drive the driving coil to move by arranging a movable impact mechanism, so as to adjust the distance between the secondary coil and the driving coils on both sides thereof, thereby achieving the purpose of adjusting the reciprocating motion stroke of the secondary coil (punch), thereby achieving flexible adjustment of the impact energy.

[0023] The utility model records the number of impacts during the impact experiment by arranging a photoelectric sensor, measures the impact force by arranging a pressure sensor, thereby facilitating the subsequent drawing of an impact force-time (Ft) curve, and can collect the impact acceleration of the punch by arranging an acceleration sensor, thereby facilitating the subsequent drawing of an impact acceleration-time (at) curve. The above sensor settings can conveniently record important experimental data during the impact experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the electromagnetic impact fatigue testing device provided by the utility model.

[0025] Figure 2 The utility model is a schematic diagram of the axial assembly of the impact rod in the electromagnetic impact fatigue testing device.

[0026] Reference numerals:

[0027] 1-first movable plate; 2-test piece; 3-punch; 4-pressure sensor; 5-first linear bearing; 6-impact rod; 7-first drive coil; 8-secondary coil; 9-second drive coil; 10-second linear bearing; 11-photoelectric detection bracket; 12-photoelectric sensor; 13-acceleration sensor; 14-support base; 15-loading end adjusting screw; 16-loading end slide; 17-test piece end slide; 18-test piece end adjusting screw; 19-first fixed plate, 20-second movable plate, 21-second fixed plate, 22-protective plate. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0032] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The technical solution of the utility model will be explained below in conjunction with specific embodiments.

[0035] like Figure 1-2 As shown, an electromagnetic impact fatigue testing device is provided, including: a supporting fixture, which is used to fix and install a test piece 2; an impact mechanism, on which a driving coil, a secondary coil 8 and a punch 3 are installed, and the secondary coil can achieve reciprocating motion under the action of the driving coil and the power supply component, thereby driving the punch 3 to repeatedly impact the test piece 2 on the supporting fixture to achieve an electromagnetic impact fatigue testing process; a power supply component, which is used to provide a driving force to the impact mechanism, and change the magnetic pole direction of the driving coil by changing the direction of the current, so that the secondary coil produces reciprocating motion under the action of the magnetic field force; the impact mechanism is also equipped with a photoelectric sensor 12 for detecting the number of impacts of the punch 3, an acceleration sensor 13 for detecting the impact acceleration of the punch 3 and a pressure sensor 4 for detecting the impact force of the punch 3.

[0036] In one feasible manner, the device also includes a support base 14; the impact mechanism and the support clamp can be detachably mounted on the support base 14, and can both move along the support base 14 and achieve position fixation, thereby achieving adjustment of the gap between the specimen 2 and the punch 3, and achieving adjustment of the reciprocating motion stroke of the punch 3.

[0037] Specifically, the support fixture includes a first fixed plate 19, a first movable plate 1 and a specimen end adjusting screw 18; the first fixed plate 19 is fixed on the support base 14, one end of the specimen end adjusting screw 18 is fixedly connected to the first fixed plate 19, and the other end passes through the first movable plate 1 and is locked by a matching nut. The side of the first movable plate 1 away from the first fixed plate 19 is used to assemble the specimen 2. A threaded slide bar is fixed to the lower end of the first movable plate 1, and a specimen end slide groove 17 is provided on the support base 14. The threaded slide bar is inserted into the specimen end slide groove 17 and can slide back and forth along it. A nut locking piece for locking its position is connected to the bottom of the threaded slide bar. When the first movable plate 1 is moved, the specimen 2 can be driven to move, thereby achieving the purpose of adjusting the distance between the specimen 2 and the punch 3.

[0038] The impact mechanism includes a second fixed plate 21, a second movable plate 20 and a loading end adjusting screw 15; the second fixed plate 21 is fixed on the support base 14, one end of the loading end adjusting screw 15 is fixedly connected to the second fixed plate 21, and the other end passes through the first movable plate 1 and is locked by a matching nut. The side of the second movable plate 20 away from the second fixed plate 21 is used to assemble the punch 3. A threaded slide rod is fixed to the lower end of the second movable plate 20, and a loading end slide groove 16 is provided on the support base 14. The threaded slide rod is inserted into the loading end slide groove 16 and can slide back and forth along it. A nut locking piece for locking its position is connected to the bottom of the threaded slide rod. When the second movable plate 20 is moved, the first drive coil 7 and the protective plates 22 on both sides thereof can be driven to move together, thereby adjusting the distance between the secondary coil 8 and the drive coils on both sides thereof, thereby achieving the purpose of adjusting the reciprocating motion stroke of the secondary coil 8 (punch 3).

[0039] In one feasible manner, the drive coil includes a first drive coil 7 and a second drive coil 9, and an impact rod 6 is also provided in the impact mechanism. The impact rod 6 passes through and is slidably connected with the second fixed plate 21, the second drive coil 9, the first drive coil 7 and the second movable plate 20 in sequence. The secondary coil 8 is located in the gap between the first drive coil 7 and the second drive coil 9, and the secondary coil 8 is fixed on the impact rod 6. The punch 3 is fixedly connected to the end of the impact rod 6 that passes through one end of the second movable plate 20.

[0040] Protective plates 22 are fixed on both sides of the first drive coil 7 and the second drive coil 9. The protective plate 22 near one end of the second movable plate 20 is fixed on the second movable plate 20, and the protective plate 22 near one end of the second fixed plate 21 is fixed on the second fixed plate 21. The impact rod 6 passes through the protective plate 22 and is slidably connected thereto.

[0041] A first linear bearing 5 is connected between the impact rod 6 and the second movable plate 20 , and a second linear bearing 10 is connected between the impact rod 6 and the second fixed plate 21 .

[0042] In one practicable manner, a photoelectric detection bracket 11 is fixed to a side of the second fixing plate 21 away from the punch 3, a photoelectric sensor 12 is fixed to the photoelectric detection bracket 11, and one end of the impact rod 6 passing through the second fixing plate 21 is located below the photoelectric sensor 12. The acceleration sensor 13 is fixedly mounted on the end of the impact rod 6 away from the punch 3. The pressure sensor 4 is fixed between the punch 3 and the impact rod 6.

[0043] In one achievable manner, the test device is based on electromagnetic emission technology and RLC circuit, and utilizes the electromagnetic force generated by the discharge of the capacitor to the drive coil. Under the interaction of magnetic forces, the secondary coil 3 and the drive coil (the first drive coil 7 and the second drive coil 9) move the secondary coil 3 to achieve impact loading on the test piece 6. The specific electromagnetic emission principle of this part belongs to the prior art and will not be described in detail here.

[0044] Specifically, an H-bridge current commutator is provided in the power supply assembly, and the H-bridge current commutator can change the direction of the current applied to the first drive coil 7 and the second drive coil 9, so that the drive coils generate alternating magnetic field forces, the positive pulse voltage generates repulsive force, and the negative pulse voltage generates attractive force, and under the action of repulsive force and attractive force, the secondary coil 8 and the impact rod 6 reciprocate together.

[0045] When the current direction is positive, the repulsive force and attractive force generated by the driving coil drive the secondary coil 8 and the impact rod 6 to impact the test piece 2, completing one impact test. When the current direction is negative, the repulsive force and attractive force generated by the driving coil cause the secondary coil 8 to return to the initial position, thus completing one cycle of the impact test.

[0046] The testing process of the electromagnetic impact fatigue testing device specifically includes the following steps:

[0047] S1. Clamp and fix the specimen: fix the specimen 2 to be impacted on the support fixture, and then move the first movable plate 1 and the second movable plate 20 along the length direction of the loading end slide 16 and the specimen end slide 17 respectively, so as to adjust the initial distance between the punch 3 and the specimen 2. After adjustment, the position is locked by the nut locking member connected to the bottom of the threaded slide rod at the lower end of the first movable plate 1 and the second movable plate 20. Among them, the larger the distance between the specimen 2 and the first fixed plate 19, the greater the impact energy borne by the specimen 2, and the higher the impact loading frequency; the larger the distance between the punch 3 and the first driving coil 7, the smaller the impact energy borne by the specimen 2, and the lower the impact loading frequency.

[0048] S2. Record the number of impacts: During the impact test, the number of impacts is recorded by the photoelectric sensor 12 fixed on the photoelectric detection bracket 11. The photoelectric sensor 12 adopts an existing counting photoelectric sensor, and the number of impacts is recorded by the number of times the light port of the photoelectric sensor 12 is blocked when the impact rod 6 reciprocates. When setting the number of impacts, for example, the number of required impacts can be pre-set. After the set number of impacts is completed, the impact test stops. The number of impacts can also be set according to the impact displacement. When a certain displacement is exceeded, it is considered that the specimen 2 is penetrated by the punch 3 or severe deformation and failure occurs, and the impact test stops.

[0049] S3. Record the impact frequency: The impact frequency consists of two parts: the system inherent impact frequency and the electromagnetic loading impact frequency, where: (1) the system inherent frequency is determined by adjusting the initial spacing between the punch 3 and the specimen 2; (2) the electromagnetic loading frequency is the reciprocal of the time required for the secondary coil to complete a reciprocating motion. By adjusting the on-off current time interval of the H-bridge current commutator, the impact cycle of the secondary coil 8 is changed, thereby achieving impact tests with different loading frequencies. The impact frequency range of the impact fatigue test is 0.1Hz~20Hz.

[0050] S4. Setting the power-on time and current: Setting the power-on current can adjust the amplitude of a single impact force. Setting the conduction time of the H-bridge current commutator can adjust the pulse width of a single impact force. For example, by changing the voltage applied to the drive coil (the first drive coil 7 and the second drive coil 9) and the secondary coil 8, the magnetic field force of the drive coil can be changed to adjust the amplitude of the loading waveform. By adjusting the conduction time of the H-bridge current commutator, the power-on time of the drive coil (the first drive coil 8 and the second drive coil 9) can be changed to achieve pulse width adjustment.

[0051] S5. Record the impact force, impact acceleration and impact times: The impact force is measured by the pressure sensor 4, so as to be used for drawing the subsequent impact force-time (Ft) curve; the impact acceleration of the punch is collected by the acceleration sensor 13, so as to be used for drawing the subsequent impact acceleration-time (at) curve, thereby facilitating a one-time integration of the acceleration-time (at) curve: , and finally the velocity-time (vt) curve of the punch (impact rod) is obtained, which can also be used to perform a second integration of the acceleration-time (at) curve, that is, to perform a first integration of the velocity-time (vt) curve: The punch (impact rod) displacement-time (Dt) curve can be obtained, and the cumulative energy transferred from the punch to the specimen during the entire impact process is .

[0052] S6. After reaching the specified number of impacts or impact displacement, the test is finished, the supporting fixture is disassembled and the specimen 2 is taken out, and an electromagnetic impact fatigue test is completed.

[0053] The above embodiments are preferred examples for implementing the present invention, and the present invention is not limited to the above embodiments. Any non-essential additions and substitutions made by those skilled in the art based on the technical features of the present invention are within the protection scope of the present invention.

Claims

1. An electromagnetic impact fatigue testing device, characterized in that: include: A supporting fixture for fixing and mounting the test piece (2); an impact mechanism, on which a driving coil, a secondary coil (8) and a punch (3) are mounted, wherein the secondary coil can achieve reciprocating motion under the action of the driving coil and the power supply assembly, thereby driving the punch (3) to repeatedly impact the test piece (2) on the supporting fixture, thereby achieving an electromagnetic impact fatigue test process; A power supply assembly, which is used to provide driving force to the impact mechanism and change the magnetic pole direction of the driving coil by changing the direction of the current, so that the secondary coil generates reciprocating motion under the action of the magnetic field force; The impact mechanism is also equipped with a photoelectric sensor (12) for detecting the number of impacts of the punch (3), an acceleration sensor (13) for detecting the impact acceleration of the punch (3), and a pressure sensor (4) for detecting the impact force of the punch (3).

2. The electromagnetic impact fatigue testing device according to claim 1, characterized in that: The device also includes a support base (14); The impact mechanism and the support fixture are both detachably mounted on the support base (14), and are both capable of moving along the support base (14) and achieving position fixation, thereby achieving adjustment of the gap between the test piece (2) and the punch (3), and achieving adjustment of the reciprocating stroke of the punch (3).

3. The electromagnetic impact fatigue testing device according to claim 2, characterized in that: The supporting fixture comprises a first fixed plate (19), a first movable plate (1) and a specimen end adjusting screw (18); The first fixed plate (19) is fixed on the support base (14); one end of the specimen end adjusting screw (18) is fixedly connected to the first fixed plate (19); the other end passes through the first movable plate (1) and is locked by a matching nut; a side of the first movable plate (1) away from the first fixed plate (19) is used to assemble the specimen (2); a threaded slide rod is fixed at the lower end of the first movable plate (1); a specimen end slide groove (17) is provided on the support base (14); the threaded slide rod is inserted into the specimen end slide groove (17) and can slide back and forth along the same; a nut locking member for locking its position is connected to the bottom of the threaded slide rod.

4. The electromagnetic impact fatigue testing device according to claim 2, characterized in that: The impact mechanism comprises a second fixed plate (21), a second movable plate (20) and a loading end adjusting screw (15); The second fixed plate (21) is fixed on the support base (14); one end of the loading end adjusting screw (15) is fixedly connected to the second fixed plate (21), and the other end passes through the first movable plate (1) and is locked by a matching nut; a side of the second movable plate (20) away from the second fixed plate (21) is used to assemble the punch (3); a threaded slide rod is fixed to the lower end of the second movable plate (20); a loading end slide groove (16) is provided on the support base (14); the threaded slide rod is inserted into the loading end slide groove (16) and can slide back and forth along the loading end slide groove; a nut locking member for locking its position is connected to the bottom of the threaded slide rod.

5. The electromagnetic impact fatigue testing device according to claim 4, characterized in that: The driving coil comprises a first driving coil (7) and a second driving coil (9), and the striking mechanism is further provided with a striking rod (6), the striking rod (6) sequentially passing through and being slidably connected to the second fixed plate (21), the second driving coil (9), the first driving coil (7) and the second movable plate (20), the secondary coil (8) being located in a gap between the first driving coil (7) and the second driving coil (9), and the secondary coil (8) being fixed on the striking rod (6), and the punch (3) being fixedly connected to an end of the striking rod (6) passing through one end of the second movable plate (20).

6. The electromagnetic impact fatigue testing device according to claim 5, characterized in that: Protective plates (22) are fixed on both sides of the first drive coil (7) and the second drive coil (9); the protective plate (22) at one end close to the second movable plate (20) is fixed on the second movable plate (20); the protective plate (22) at one end close to the second fixed plate (21) is fixed on the second fixed plate (21); and the impact rod (6) passes through the protective plate (22) and is slidably connected thereto.

7. The electromagnetic impact fatigue testing device according to claim 5, characterized in that: A first linear bearing (5) is connected between the impact rod (6) and the second movable plate (20), and a second linear bearing (10) is connected between the impact rod (6) and the second fixed plate (21).

8. The electromagnetic impact fatigue testing device according to claim 5, characterized in that: A photoelectric detection bracket (11) is fixed to a side of the second fixing plate (21) away from the punch (3), the photoelectric sensor (12) is fixed to the photoelectric detection bracket (11), and one end of the impact rod (6) passing through the second fixing plate (21) is located below the photoelectric sensor (12).

9. The electromagnetic impact fatigue testing device according to claim 5, characterized in that: The acceleration sensor (13) is fixedly mounted on an end of the impact rod (6) away from the punch (3); and the pressure sensor (4) is fixed between the punch (3) and the impact rod (6).

10. The electromagnetic impact fatigue testing device according to claim 5, characterized in that: An H-bridge current commutator is provided in the power supply assembly, and the H-bridge current commutator is capable of changing the direction of the current applied to the first drive coil (7) and the second drive coil (9), so that the drive coils generate alternating magnetic field forces, the positive pulse voltage generates repulsive force, and the negative pulse voltage generates attractive force, and under the action of the repulsive force and attractive force, the secondary coil (8) and the impact rod (6) reciprocate together.

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