A high frequency fatigue testing device for metal matrix composites

Abstract

The utility model relates to a kind of metal composite material high-frequency fatigue test device, including support frame, testing device, protective cover and fixing device, testing device is installed on the support frame, the testing device is used to further test the tensile fatigue strength of metal by constantly increasing the force of stretching;The protective cover is installed on the testing device outside;The fixing device is installed on the testing device, and the fixing device is used to fix the metal to be tested.By the closed transmission chain of motor-reducer-screw integrated in test support, cooperate with the symmetrical limiting rod in displacement groove and displacement block limiting hole, the loading axis and the sample center line always keep high-precision coaxial, avoid eccentric error;Motor support supports reducer independently, suppresses bending deformation and resonance, improves long-term stability;Fixing device realizes sample trace eccentricity compensation, quick plug-in clamping and double-groove limiting positioning with the laminated structure of fixed block-adjusting disc-clamping block-mounting block, and different size samples can be replaced by a person.

Description

Technical Field

[0001] This utility model relates to the field of fatigue detection technology, specifically to a high-frequency fatigue testing device for metal composite materials. Background Technology

[0002] Metal fatigue testing is an experimental method that simulates the long-term service behavior of materials under alternating stress. By applying cyclic loads such as periodic tension-compression, bending, or torsion to standard specimens, the number of cycles after which crack initiation, propagation, and eventual fracture occur is determined, resulting in an SN curve or ε-N curve. This allows for the determination of key indicators such as fatigue limit, fatigue life, and crack propagation rate. This test is a core tool for evaluating the reliability of critical components such as aircraft blades, high-speed rail axles, and bridge cables under alternating loads such as vibration, start-stop, or wind and waves, providing data support for structural design, life prediction, and safe operation and maintenance.

[0003] Existing metal fatigue testing devices generally suffer from cumbersome operation and low automation: on the one hand, sample clamping requires manual and repeated calibration of the center line and load axis, which is time-consuming and easily introduces eccentricity error, resulting in long test cycles and high labor costs per batch. Furthermore, there is a lot of human intervention and large data dispersion, making it difficult to meet the needs of rapid evaluation of fatigue performance of large batches and high precision for existing metal parts.

[0004] Therefore, the present invention provides a high-frequency fatigue testing device for metal composite materials to solve the above problems. Utility Model Content

[0005] The technical problem to be solved by this utility model is that existing metal fatigue testing devices generally suffer from cumbersome operation and low degree of automation. On the one hand, sample clamping requires manual repeated calibration of the center line and load axis, which is time-consuming and easily introduces eccentric error, resulting in long test cycles and high labor costs for a single batch. Furthermore, there is a lot of human intervention and large data dispersion, which makes it difficult to meet the needs of rapid evaluation of fatigue performance of large batches and high precision of existing metal parts.

[0006] This utility model provides the following technical solution: a high-frequency fatigue testing device for metal composite materials, comprising a support frame, a testing device, a protective cover, and a fixing device. The testing device is installed on the support frame and is used to test the tensile fatigue strength of the metal by continuously increasing the tensile force. The protective cover is installed on the outside of the testing device. The fixing device is installed on the testing device and is used to fix the metal to be tested.

[0007] Preferably, the testing device includes a testing bracket, a testing motor, a reducer, a displacement groove, a rotating lead screw, a displacement block, and an L-shaped block. The testing bracket is mounted on the support frame, the testing motor is mounted above the testing bracket, the reducer is mounted at the output end of the testing motor, the testing bracket has a displacement groove inside, a rotating lead screw is provided in the displacement groove, a displacement block is mounted on the rotating lead screw, and an L-shaped block is mounted on the displacement block.

[0008] Preferably, the reducer is provided with a motor bracket on the outer side, and the motor bracket is installed between the test motor and the test bracket.

[0009] Preferably, limit rods are symmetrically arranged in the displacement groove, and limit holes corresponding to the limit rods are opened on the displacement block.

[0010] Preferably, the fixing device includes a fixing block, an adjusting plate, a clamping block, a clamping groove, a mounting block, and a mounting groove. The fixing block is installed below the L-shaped block, the adjusting plate is installed below the fixing block, the clamping block is installed below the adjusting plate, the clamping block has a clamping groove, the mounting block is installed below the clamping block, and a mounting block is provided below the clamping block, with a mounting groove formed on the mounting block.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. This utility model integrates a closed transmission chain of motor-reducer-screw within the test bracket, along with symmetrical limiting rods and limiting holes in the displacement groove, ensuring that the loading axis and the center line of the sample remain coaxial with high precision, thus avoiding eccentricity errors. The motor bracket independently supports the reducer, suppressing bending deformation and resonance, and improving long-term stability. The fixing device uses a stacked structure of fixing block-adjusting plate-clamping block-installation block to achieve micro-eccentricity compensation of the sample, quick insertion and removal clamping, and double-groove limiting positioning, allowing a single person to change samples of different sizes in seconds. The entire device can be started with one button to complete continuous loading until fracture, significantly reducing manual adjustment and downtime for retesting, shortening the test cycle, and reducing maintenance frequency. Thus, with its compact structure, high coaxial precision, and high level of automation, it comprehensively improves the efficiency, accuracy, and reliability of metal fatigue testing. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1This is a schematic diagram of the overall design of this utility model;

[0015] Figure 2 This is a schematic diagram of the interior of the protective cover of this utility model;

[0016] Figure 3 This is a schematic diagram of the inside of the displacement groove of this utility model;

[0017] Figure 4 This is a schematic diagram of the fixing device of this utility model;

[0018] Figure 5 This is a schematic diagram of the mounting block of this utility model.

[0019] In the diagram: 1. Support frame; 2. Testing device; 21. Testing bracket; 22. Testing motor; 23. Reducer; 24. Displacement groove; 25. Rotating lead screw; 26. Displacement block; 27. L-shaped block; 3. Protective cover; 4. Fixing device; 41. Fixing block; 42. Adjusting disc; 43. Clamping block; 44. Clamping groove; 45. Mounting block; 46. Mounting groove; 5. Motor bracket; 6. Limiting rod; 7. Limiting hole. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely represents some embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and "back side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is conventionally placed during use. These terms are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0023] It should also be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] The present invention aims to address the problems of cumbersome operation and low automation in existing metal fatigue testing devices. On the one hand, sample clamping requires manual and repeated calibration of the center line and load axis, which is time-consuming and easily introduces eccentricity error, resulting in long test cycles and high labor costs per batch. Furthermore, the large amount of human intervention and high data dispersion make it difficult to meet the needs of rapid evaluation of the fatigue performance of large batches and high precision of existing metal parts. In view of this, the present disclosure proposes a high-frequency fatigue testing device for metal composite materials. Through a closed transmission chain integrating a motor-reducer-screw within the test bracket, and with symmetrical limiting rods and limiting holes in the displacement groove, the loading axis and the center line of the sample are always kept coaxial with high precision, avoiding eccentricity errors. The motor bracket independently supports the reducer, suppressing bending deformation and resonance, and improving long-term stability. The fixing device uses a stacked structure of fixing block-adjusting plate-clamping block-installation block to achieve micro-eccentricity compensation of the sample, quick insertion and removal clamping, and double-groove limiting positioning. A single person can change samples of different sizes in seconds. The entire device can be started with one button to complete continuous loading until fracture, significantly reducing manual adjustment and downtime for retesting, shortening the test cycle, and reducing maintenance frequency. Thus, with its compact structure, high coaxial precision, and high level of automation, it comprehensively improves the efficiency, accuracy, and reliability of metal fatigue testing.

[0025] like Figures 1 to 5 As shown, a high-frequency fatigue testing device for metal composite materials includes a support frame 1, a testing device 2, a protective cover 3, and a fixing device 4. The testing device 2 is installed on the support frame 1 and is used to test the tensile fatigue strength of the metal by continuously increasing the tensile force. The protective cover 3 is installed on the outside of the testing device 2. The fixing device 4 is installed on the testing device 2 and is used to fix the metal to be tested.

[0026] By integrating a closed transmission chain of motor-reducer 23-screw within the test bracket 21, and cooperating with the symmetrical limiting rod 6 in the displacement groove 24 and the limiting hole 7 in the displacement block 26, the loading axis and the center line of the sample are always kept coaxial with high precision, avoiding eccentricity error. The motor bracket 5 independently supports the reducer 23, suppressing bending deformation and resonance, and improving long-term stability. The fixing device 4 uses a stacked structure of fixing block 41-adjusting plate 42-clamping block 43-installation block 45 to achieve micro-eccentricity compensation of the sample, quick insertion and removal clamping, and double groove limiting positioning. A single person can change samples of different sizes in seconds. The entire device can be started with one button to complete continuous loading until fracture, significantly reducing manual adjustment and downtime for retesting, shortening the test cycle, and reducing maintenance frequency. Thus, with its compact structure, high coaxiality accuracy, and high level of automation, it comprehensively improves the efficiency, accuracy, and reliability of metal fatigue testing.

[0027] like Figures 1 to 3 As shown, the testing device 2 includes a testing bracket 21, a testing motor 22, a reducer 23, a displacement groove 24, a rotating lead screw 25, a displacement block 26, and an L-shaped block 27. The testing bracket 21 is mounted on the support frame 1. The testing motor 22 is mounted on top of the testing bracket 21. The reducer 23 is mounted on the output end of the testing motor 22. The testing bracket 21 has a displacement groove 24 inside. The rotating lead screw 25 is arranged in the displacement groove 24. The displacement block 26 is mounted on the rotating lead screw 25. The L-shaped block 27 is mounted on the displacement block 26.

[0028] During operation, the staff places the metal to be tested into the fixed device 4. At this time, the test motor 22 starts and drives the reducer 23 to rotate. The reducer 23 drives the rotating screw 25 to rotate, and the rotating screw 25 drives the displacement block 26 to move upward, which in turn drives the fixed device 4 to move upward, gradually pulling the metal to be tested to break, thus completing the test of its metal fatigue strength.

[0029] By integrating the test motor 22, reducer 23, rotating lead screw 25, displacement block 26, and L-shaped block 27 into the same test bracket 21, a closed transmission chain of "motor-reduction-lead screw-linear displacement" is formed, realizing automatic lifting and loading of the sample. This eliminates the need for numerous manual adjustments of valves and knobs and repeated disassembly and calibration steps in traditional devices. Simultaneously, the cooperation between the displacement groove 24 and the displacement block 26 ensures that the load axis always coincides with the sample centerline, significantly reducing eccentricity error and improving test accuracy. The entire test process requires only one-button start to complete continuous loading until fracture, greatly reducing human intervention and shortening the single-piece test cycle. Thus, it achieves efficient and accurate evaluation of metal fatigue strength with a compact structure, simple operation, and high reliability.

[0030] like Figure 3As shown, a motor bracket 5 is provided on the outer side of the reducer 23. The motor bracket 5 is installed between the test motor 22 and the test bracket 21. The addition of the motor bracket 5 between the test motor 22 and the test bracket 21 provides the reducer 23 with independent and stable support, avoiding bending deformation and resonance caused by the motor's own weight and the reaction force of the reducer 23 acting directly on the test bracket 21. This significantly improves the coaxiality and stability of load transmission. At the same time, the bracket raises the entire motor-reducer 23 module, which facilitates heat dissipation and maintenance, reduces accuracy drift caused by temperature rise, and further extends the life of the device, reduces the calibration frequency, and enables reliable operation of metal fatigue testing under high-precision and long-cycle conditions.

[0031] like Figure 3 As shown, limit rods 6 are symmetrically arranged in the displacement groove 24, and limit holes 7 corresponding to the limit rods 6 are opened on the displacement block 26. By symmetrically adding limit rods 6 in the displacement groove 24 and correspondingly opening limit holes 7 on the displacement block 26, a three-point guide structure of "lead screw-double limit rods 6" is formed, which significantly suppresses the rotational freedom and lateral sway of the displacement block 26 during the lifting process, ensuring that the load axis and the sample center line always maintain high-precision coaxiality. At the same time, this design avoids uneven wear and jamming caused by unilateral force on the lead screw, reduces mechanical wear and maintenance frequency, and thus improves the long-term stability of the device.

[0032] like Figures 1 to 5 As shown, the fixing device 4 includes a fixing block 41, an adjusting plate 42, a clamping block 43, a clamping groove 44, a mounting block 45, and a mounting groove 46. The fixing block 41 is installed below the L-shaped block 27, the adjusting plate 42 is installed below the fixing block 41, the clamping block 43 is installed below the adjusting plate 42, the clamping block 43 is installed on the clamping block 43, the mounting block 45 is installed below the clamping block 43, and the mounting block 45 is provided below the clamping block 43, and the mounting block 45 is provided with a mounting groove 46.

[0033] The fixing device 4 integrates sample clamping, center fine adjustment, rapid loading and unloading, and reference positioning into one unit through a six-level coaxial stacked structure of "fixing block 41 - adjusting plate 42 - clamping block 43 - clamping groove 44 - mounting block 45 - mounting groove 46". The adjusting plate 42 can perform slight eccentricity compensation for the sample without disassembling the clamp. The clamping groove 44 and the mounting groove 46 form upper and lower double limits to ensure that the axis of the sample of different sizes is instantly coincided with the loading axis. The mounting block 45 and the clamping block 43 are connected by a pluggable connection, which can realize the sample replacement by a single person in seconds, greatly shorten the clamping time and eliminate the repeated positioning error, thereby significantly improving the test efficiency and data consistency while ensuring high coaxial accuracy.

[0034] The overall working process is as follows: the staff puts the metal to be tested into the fixed device 4. At this time, the test motor 22 starts and drives the reducer 23 to rotate. The reducer 23 drives the rotating screw 25 to rotate. The rotating screw 25 drives the displacement block 26 to move upward, which in turn drives the fixed device 4 to move upward, gradually pulling the metal to be tested to break, thus completing the test of its metal fatigue strength.

[0035] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-frequency fatigue testing device for metal composite materials, characterized in that, The device includes a support frame (1), a testing device (2), a protective cover (3), and a fixing device (4). The testing device (2) is installed on the support frame (1) and is used to test the tensile fatigue strength of the metal by continuously increasing the tensile force. The protective cover (3) is installed on the outside of the testing device (2). The fixing device (4) is installed on the testing device (2) and is used to fix the metal to be tested.

2. The high-frequency fatigue testing device for metal composite materials according to claim 1, characterized in that: The testing device (2) includes a test bracket (21), a test motor (22), a reducer (23), a displacement groove (24), a rotating screw (25), a displacement block (26), and an L-shaped block (27). The test bracket (21) is mounted on the support frame (1). The test motor (22) is mounted above the test bracket (21). The reducer (23) is mounted on the output end of the test motor (22). The test bracket (21) has a displacement groove (24) inside. The rotating screw (25) is installed in the displacement groove (24). The displacement block (26) is mounted on the rotating screw (25). The L-shaped block (27) is mounted on the displacement block (26).

3. The high-frequency fatigue testing device for metal composite materials according to claim 2, characterized in that: The reducer (23) has a motor bracket (5) installed on the outside, and the motor bracket (5) is installed between the test motor (22) and the test bracket (21).

4. The high-frequency fatigue testing device for metal composite materials according to claim 3, characterized in that: Limiting rods (6) are symmetrically arranged in the displacement groove (24), and limiting holes (7) corresponding to the limiting rods (6) are opened on the displacement block (26).

5. The high-frequency fatigue testing device for metal composite materials according to claim 4, characterized in that: The fixing device (4) includes a fixing block (41), an adjusting plate (42), a clamping block (43), a clamping groove (44), a mounting block (45), and a mounting groove (46). The fixing block (41) is installed below the L-shaped block (27). The adjusting plate (42) is installed below the fixing block (41). The clamping block (43) is installed below the adjusting plate (42). The clamping groove (44) is installed on the clamping block (43). The mounting block (45) is installed below the clamping block (43). The mounting block (45) is provided below the clamping block (43). The mounting groove (46) is opened on the mounting block (45).

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