A vibration fatigue test device and test method for composite material simulation parts

Abstract

The present invention belongs to the field of mechanical experiment technology, and specifically relates to a composite material simulation component vibration fatigue test device and test method. It comprises a fixing fixture (1), an upper pressing block (2), a rear pressing block (3), a T-shaped simulation component (4) and a fastening bolt. The present invention can achieve uniform and stable clamping of the T-shaped simulation component through the coordinated fixation of the fastening bolt, the upper pressing block and the rear pressing block. The device is fixed to the vibration table by threads, and can achieve stable vibration fatigue loading, thereby solving the problem of small clamping area and difficult clamping of the bottom plate of the T-shaped specimen in the vibration fatigue test.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical experiments, and in particular relates to a vibration fatigue test device and a test method for composite material simulation parts. Background Art

[0002] Aircraft engine blades are subjected to vibration loads during their service. When the engine is working, the airflow or structural vibration causes the engine blades to resonate, which is a high-cycle vibration fatigue load. The T-type specimens simulating fiber-reinforced metal matrix composite fan blades have the problem of small vertical clamping area and difficult clamping in the vibration fatigue test. Therefore, it is necessary to develop a mechanical loading device suitable for the vibration fatigue test of this type of specimen, so that it can use vibration excitation equipment such as a vibration table to realize the vibration fatigue test of this type of specimen, and provide reliable test data for the service safety of engine blades and materials. Summary of the invention

[0003] In view of the above-mentioned situation of the prior art, the purpose of the present invention is to provide a test device suitable for vibration fatigue loading of T-type simulation parts, so as to utilize existing vibration excitation equipment such as vibration tables to realize vibration fatigue testing of this type of specimens.

[0004] The above-mentioned object of the present invention is achieved by utilizing the following technical solutions:

[0005] A vibration fatigue test device for composite material simulation parts, comprising a fixing fixture 1, an upper pressing block 2, a rear pressing block 3, and a T-shaped simulation part 4; the upper end of the fixing fixture 1 is a rectangular structure, with a rectangular through hole 10, a through slot 11 on one side of the rectangular through hole 10, a rectangular slot 16 at the rear side of the rectangular through hole 10 opposite to the through slot 11, and a rectangular boss 31 of the rear pressing block 3 is slidably connected to the rectangular slot 16; the contact position 415 on the outer side of the vertical plate 41 of the T-shaped simulation part 4 is tightly matched with the contact plane 34 of the rear pressing block 3; the bottom surface 23 of the upper pressing block 2 is tightly matched with the upper plane 411 of the vertical plate 41 of the T-shaped simulation part 4, and the horizontal plate 42 of the T-shaped simulation part 4 extends out through the through slot 11.

[0006] Two threaded through holes a12 are provided at the top of the rectangular through hole 10. Two coplanar contact planes 14 are provided at the inner wall of the rectangular through hole 10 near the opening 11. A contact bottom surface 15 perpendicular to the contact planes 14 is provided at the inner bottom of the rectangular through hole 10.

[0007] A stud 17 is provided at the lower end of the rectangular structure of the fixing fixture 1 and is fixedly connected to the moving coil of the vibration table.

[0008] Two threaded through holes b13 are provided at the position of the rectangular groove 16, and two circular limiting grooves 32 are provided on the top surface of the rectangular boss 31. The movement of the rear pressure block 3 in the horizontal direction is achieved by applying force of bolts through the threaded through holes b13.

[0009] The upper pressing block 2 is a rectangular structure with two circular limit grooves 22 on the top surface. The tightening force is applied by bolts through the two threaded through holes a12 at the top of the rectangular through hole 10 and the two circular limit grooves on the top surface of the upper pressing block 2, so that the bottom surface 23 of the upper pressing block 2 is tightly matched with the upper plane 411 of the vertical plate 41 of the T-shaped simulation component 4, and at the same time, the lower plane 413 of the vertical plate 41 and the contact bottom surface 15 of the rectangular through hole 10 are tightly matched.

[0010] The rear pressure block 3 is a rectangular structure, and a circular arc groove 33 is provided at the center of the front end to divide the front side plane into two coplanar contact planes 34 . The contact plane 34 is tightly matched with the contact position 415 on the outer side of the T-shaped simulation part 41 .

[0011] The T-shaped simulation member 4 is an orthogonal plate structure, wherein the upper plane 411 and the lower plane 413 of the vertical plate 41, the planes 412 and 414 on the inner side of the vertical plate 41 and the two plane areas 415 on the opposite side of the vertical plate 41 are clamping areas.

[0012] A test method for a composite material simulation component vibration fatigue test device. When conducting a T-shaped simulation component vibration fatigue test, first fix the fixing fixture 1 on the moving coil of the electromagnetic vibration table through a transition tooling; install the vertical plate 41 of the T-shaped simulation component 4 into the fixing fixture 1, and insert the horizontal plate 42 into the rectangular through groove 11 until the T-shaped simulation component 4 is located in the center of the fixture 1, and make the planes 412 and 414 of the vertical plate 41 closely contact with the contact plane 14 of the fixture 1; insert the rectangular boss of the rear pressure block 3 into the rectangular through groove 16 of the fixing fixture 1, align the two circular limit grooves 32 with the threaded through hole b13, install a screw in the threaded through hole b13, and apply force to the rear pressure block 3 to make it slide forward until the T-shaped The vertical plate 41 of the simulation component 4 is clamped together by the fixing fixture 1 and the rear pressure block 3; the upper pressure block 2 is inserted into the upper edge of the vertical plate 41 of the T-shaped simulation component, the two circular limit grooves 22 are aligned with the threaded through hole a (12), a screw is installed in the threaded through hole a12, and force is applied to the upper pressure block 2 to make the upper plane 411 and the lower plane 413 of the vertical plate 41 tightly contact with the upper pressure block 2 and the fixing fixture 1 respectively; the fixing bolts at the threaded through holes a12 and b13 are repeatedly coordinated and adjusted until the vertical plate 41 of the T-shaped simulation component is completely fixed; the electromagnetic vibration table is started, the first-order resonance frequency of the T-shaped simulation component 4 is determined by frequency sweeping, and the excitation is continuously carried out at its first-order resonance frequency until fatigue damage occurs to the test piece, and the test is stopped.

[0013] Beneficial effects of the invention: The invention can achieve uniform and stable clamping of the T-shaped simulation part by the coordinated fixation of the fastening bolts, the upper pressure block and the rear pressure block. The device is fixed to the vibration table by threads and can achieve stable vibration fatigue loading, solving the problem of small clamping area and difficult clamping of the bottom plate of the T-shaped specimen in the vibration fatigue test. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the clamping position and clamping direction of the T-shaped simulation member of the present invention;

[0015] Figure 2 is a three-dimensional assembly diagram of the device of the present invention;

[0016] Figure 3 It is a three-view drawing of the fixing fixture of the device of the present invention;

[0017] Figure 4 It is a three-view drawing of the upper pressing block of the device of the present invention;

[0018] Figure 5 It is a three-view drawing of the rear pressing block of the device of the present invention;

[0019] Figure 6 It is a three-view drawing of a T-shaped simulation part of the device of the present invention.

[0020] Among them: 1-fixing fixture, 2-upper pressure block, 3-rear pressure block, 4-T-shaped simulation part, 10-rectangular through hole, 11-through groove, 12-threaded through hole a, 13-threaded through hole b, 14-contact plane, 15-contact bottom surface, 16-rectangular groove, 17-stud, 22-limiting groove 23-bottom surface, 33-arc groove, 31-rectangular boss, 32-circular limiting groove, 33-arc groove, 34-contact plane, 41-vertical plate, 411-upper plane, 412, 414-inner plane, 413-lower plane, 415-plane area DETAILED DESCRIPTION

[0021] In order to more clearly understand the purpose, technical solutions and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and examples.

[0022] Figure 1 The T-shaped simulation member of the present invention is shown. The direction indicated by the arrow in the figure is the position where the simulation is clamped and the direction of the tightening force. The clamping method shown in the figure is characterized by: 1. Clamping in the vertical and horizontal directions at the same time; 2. According to the structural characteristics of the T-shaped member, a uniform and symmetrical horizontal clamping force is applied to the upper and lower parts of the vertical plate respectively. Figure 2 The three-dimensional assembly structure of the present invention is shown. Figure 3 to Figure 6 The structural diagram of each component of the device described in the present invention is illustrated in detail. Figure 1The fixing fixture 1 of the device has a rectangular structure on the upper part, with a rectangular through hole 10, an open through slot 11 on one side of the rectangular through hole 10, two threaded through holes a12 for fastening on the top of the rectangular through hole 10, two threaded through holes b13 on the rear side of the rectangular through hole 10 opposite to the through slot 11, two coplanar contact planes 14 on the inner wall of the rectangular through hole 10 near the through slot 11, a contact bottom surface 15 perpendicular to the contact plane 14 on the inner bottom of the rectangular through hole 10, a rectangular groove 16 on the rear side of the inner wall of the rectangular through hole 10, and a stud 17 on the lower part of the fixing fixture 1 fixedly connected to the moving coil of the vibration table. Figure 4 The upper pressing block 2 of the device described in the present invention has a rectangular structure and two circular limiting grooves 22 on the top surface, which are used to align and contact with the fixing bolts. The tightening force is applied by bolts of the two threaded through holes a12 at the top of the rectangular through hole 10, so that the bottom surface 23 of the upper pressing block 2 is tightly matched with the upper plane 411 of the vertical plate 41 of the T-shaped simulation part 4, and at the same time, the lower plane 413 of the vertical plate 41 is tightly matched with the contact bottom surface of the rectangular through hole 10. Figure 5 The rear pressure block 3 of the device of the present invention has a rectangular structure, and a rectangular boss 31 is provided on the rear side to be slidably connected with the rectangular groove 16 of the fixing fixture 1. There are two circular limit grooves 32 on the top surface of the rectangular boss 31, and the horizontal movement of the rear pressure block 3 is achieved by applying force of the bolts of the threaded through hole b13 on the rear side of the rectangular through hole 10. There is an arc groove 33 at the central position of the front end of the rear pressure block 3 to divide the front side plane into two coplanar contact planes 34. The contact plane 34 is tightly matched with the contact position 415 on the outside of the T-shaped simulation part 41. Figure 6 It is the T-shaped simulation part described in the device of the present invention. This part is an abstract model of the test object, which has an orthogonal plate structure and is divided into a vertical plate 41 and a horizontal plate 42. The upper plane 411 and the lower plane 413 of the vertical plate 41, the planes 412 and 414 on the inner side of the vertical plate 41, and the two plane areas 415 on the opposite side of the vertical plate 41 are clamping areas.

[0023] When conducting the vibration fatigue test of the T-type simulation part, first fix the fixing fixture 1 on the moving coil of the electromagnetic vibration table through the transition tooling. The vertical plate 41 of the T-type simulation part 4 is installed in the fixing fixture 1, and the horizontal plate 42 is inserted into the rectangular through groove 11 until the T-type simulation part 4 is located in the center of the fixture 1, and the planes 412 and 414 of the vertical plate 41 are in close contact with the contact plane 14 of the fixture 1. Insert the rectangular boss of the rear pressure block 3 into the rectangular through groove 16 of the fixing fixture 1, align the two circular limit grooves 32 with the threaded through hole b13, install the screw in the threaded through hole b13, and apply force to the rear pressure block 3 to make it slide forward until the vertical plate 41 of the T-type simulation part is clamped by the fixing fixture 1 and the rear pressure block 3. Insert the upper pressing block 2 on the upper edge of the vertical plate 41 of the T-shaped simulation part, align the two circular limiting grooves 22 with the threaded through hole a (12), install a screw in the threaded through hole a12, and apply force to the upper pressing block 2 so that the upper plane 411 and the lower plane 413 of the vertical plate 41 are in close contact with the upper pressing block 2 and the fixing fixture 1 respectively. Repeatedly coordinate and adjust the fixing bolts at the threaded through holes a12 and b13 until the vertical plate 41 of the T-shaped simulation part is completely fixed. Start the electromagnetic vibration table, determine the first-order resonance frequency of the T-shaped simulation part 4 by frequency sweeping, and continue to excite at its first-order resonance frequency until the test piece suffers fatigue damage, and then stop the test.

Claims

1. A test method for a composite material simulation component vibration fatigue test device, characterized in that: It comprises a fixing fixture (1), an upper pressing block (2), a rear pressing block (3), and a T-shaped simulation member (4); the upper end of the fixing fixture (1) is a rectangular structure, having a rectangular through hole (10), a through slot (11) on one side of the rectangular through hole (10), a rectangular slot (16) on the rear side of the rectangular through hole (10) at a position opposite to the through slot (11), and a rectangular boss (31) of the rear pressing block (3) is slidably connected to the rectangular slot (16); a contact position (415) on the outer side of the vertical plate (41) of the T-shaped simulation member (4) is tightly matched with a contact plane (34) of the rear pressing block (3); the bottom surface (23) of the upper pressing block (2) is tightly matched with an upper plane (411) of the vertical plate (41) of the T-shaped simulation member (4), and a horizontal plate (42) of the T-shaped simulation member (4) extends out through the through slot (11); The top of the rectangular through hole (10) is provided with two threaded through holes a (12), the inner wall of the rectangular through hole (10) near the through groove (11) has two coplanar contact planes (14), and the inner bottom of the rectangular through hole (10) has a contact bottom surface (15) perpendicular to the contact planes (14); The rectangular groove (16) is provided with two threaded through holes b (13), and the top surface of the rectangular boss (31) has two circular limiting grooves (32), and the rear pressure block (3) is moved in the horizontal direction by applying force of bolts through the threaded through holes b (13); The lower end of the rectangular structure of the fixing fixture (1) is provided with a stud (17) which is fixedly connected to the moving coil of the vibration table; The upper pressing block (2) is a rectangular structure with two circular limiting grooves on the top surface. The tightening force is applied by bolts through two threaded through holes a (12) at the top of the rectangular through hole (10) and the two circular limiting grooves on the top surface of the upper pressing block (2), so that the bottom surface (23) of the upper pressing block (2) is tightly matched with the upper plane (411) of the vertical plate (41) of the T-shaped simulation member (4), and at the same time, the lower plane (413) of the vertical plate (41) and the contact bottom surface (15) of the rectangular through hole (10) are tightly matched; The rear pressure block (3) is a rectangular structure, and a circular arc groove (33) is provided at the center of the front end to divide the front side plane into two coplanar contact planes (34), and the contact plane (34) is tightly matched with the contact position (415) on the outside of the T-shaped simulation piece (4); The T-shaped simulation member (4) is an orthogonal plate structure, wherein the upper plane (411) and the lower plane (413) of the vertical plate (41), the planes (412, 414) on the inner side of the vertical plate (41) and their positions on the opposite side of the vertical plate (41) are clamping areas; When the vibration fatigue test device is used to carry out the vibration fatigue test of the T-shaped simulation part, the fixing fixture (1) is first fixed on the moving coil of the electromagnetic vibration table through the transition tooling; the vertical plate (41) of the T-shaped simulation part (4) is installed in the fixing fixture (1), and the horizontal plate (42) is inserted into the through groove (11) until the T-shaped simulation part (4) is located in the center of the fixing fixture (1), and the planes (412, 414) of the vertical plate (41) are in close contact with the contact plane (14) of the fixing fixture (1); the rectangular boss of the rear pressure block (3) is inserted into the rectangular groove (16) of the fixing fixture (1), the two circular limit grooves (32) are aligned with the threaded through hole b (13), a screw is installed in the threaded through hole b (13), and force is applied to the rear pressure block (3) to make it slide forward until the T-shaped The vertical plate (41) of the simulation component (4) is clamped together by the fixing fixture (1) and the rear pressing block (3); the upper pressing block (2) is inserted into the upper edge of the vertical plate (41) of the T-shaped simulation component, the two circular limit grooves are aligned with the threaded through hole a (12), a screw is installed in the threaded through hole a (12), and force is applied to the upper pressing block (2) so that the upper plane (411) and the lower plane (413) of the vertical plate (41) are in close contact with the upper pressing block (2) and the fixing fixture (1) respectively; the fixing bolts at the threaded through holes a (12) and b (13) are adjusted until the vertical plate (41) of the T-shaped simulation component is completely fixed; the electromagnetic vibration table is started, the first-order resonance frequency of the T-shaped simulation component (4) is determined by frequency sweeping, and the excitation is continuously performed at the first-order resonance frequency until the test component is fatigue damaged, and the test is stopped.

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