High-temperature fatigue test system for composite casing mounting seat and test method of high-temperature fatigue test system

Abstract

The invention discloses a high-temperature fatigue test system and a high-temperature fatigue test method for a composite casing mounting seat, and belongs to the technical field of fatigue test of casing mounting seats. The system comprises a biaxial fatigue test device, a test piece, a heating device, a data acquisition assembly and a controller, the test piece is installed on the biaxial fatigue test device, and the heating device and the data acquisition assembly are both connected with the test piece. The controller is electrically connected with the biaxial fatigue test device, the heating device and the data acquisition assembly. The heating device is used for heating the test piece to simulate the high-temperature working condition of the test piece, the biaxial fatigue test device is used for performing biaxial loading on the test piece, and the data acquisition component is used for acquiring strain data of the test piece in the test process, so that the biaxial tensile fatigue test on the composite casing mounting seat is realized. Therefore, the high-temperature fatigue performance of the composite material outer culvert casing mounting seat under the dual effects of the internal pressure and the axial force can be verified.

Description

TECHNICAL FIELD

[0001] The present application relates to a composite material casing mounting seat high temperature fatigue test system and a test method thereof, and belongs to the technical field of casing mounting seat fatigue test. BACKGROUND

[0002] The function of the casing component of an aero-engine is to form an airflow passage, transmit thrust, torque and axial force of parts and components, and is an important load-bearing part in the aero-engine. For a composite material casing, various metal mounting seats for maintenance and support, fixed pipes and supports and the like are riveted thereon, and under the periodic action of axial force and internal pressure, biaxial tensile fatigue failure is prone to occur at the position where the mounting seat is located. In particular, if the mounting seat for fixing the high-temperature gas pipe fails in biaxial tensile fatigue, it will cause the composite material casing to contact the high-temperature pipe, and further cause the composite material casing to fail in ablation and creep damage. Therefore, when designing an outer casing, biaxial tensile fatigue test of the mounting seat is often needed.

[0003] At present, the test design for studying the fatigue performance of the typical component of the composite material casing mounting seat is mainly single-axis loading, and this test scheme cannot well simulate the complex stress distribution of the composite material around the mounting seat under the real working condition, and the fatigue test data obtained cannot accurately reflect the fatigue performance of the typical component of the composite material casing mounting seat. The existing biaxial fatigue test equipment or system for composite materials is mostly used for studying the material properties of the composite material itself or the fatigue crack propagation characteristics of the hole component.

[0004] Therefore, how to develop a composite material casing mounting seat high temperature fatigue test system to carry out biaxial tensile fatigue test on the composite material casing mounting seat is a technical problem to be solved by those skilled in the art. SUMMARY

[0005] To solve the above technical problems, the present application provides a composite material casing mounting seat high temperature fatigue test system and a test method thereof.

[0006] The present application is realized by the following technical solutions:

[0007] A composite material casing mounting seat high temperature fatigue test system, comprising a biaxial fatigue test device, a test piece, a heating device, a data acquisition assembly and a controller, the test piece is installed on the biaxial fatigue test device, the heating device and the data acquisition assembly are connected with the test piece, and the controller is electrically connected with the biaxial fatigue test device, the heating device and the data acquisition assembly respectively.

[0008] The biaxial fatigue test device is a biaxial tensile tester.

[0009] The test piece comprises a test piece body and a mounting seat, the test piece body is cross-shaped, an adapter clamp is arranged at each end of the test piece body, a test area is arranged at the cross-shaped intersection of the test piece body, a through hole A is formed in the test area along the thickness direction, and the mounting seat penetrates through the through hole A and is riveted to the test area by a plurality of rivets.

[0010] The test piece body comprises four clamping arms, one end of the four clamping arms is connected together to form a cross-shaped test piece body.

[0011] The clamping arm is rectangular, the test area is circular, and the diameter of the test area is consistent with the width of the clamping arm.

[0012] The composite material layer mode of the clamping arm is consistent with the material layer mode of the outer containment casing shell.

[0013] The test area is thickened relative to the clamping arm, and the composite material layer mode of the test area is consistent with the material layer mode of the outer containment casing shell at the mounting seat.

[0014] The adapter clamp comprises a pad and two clamp plates, the pad is placed between the two clamp plates, one end of the two clamp plates is connected to the end of the clamping arm away from the test area by a plurality of fasteners, and the clamping arm is located between the two clamp plates.

[0015] The clamp plate comprises a clamping section and an adapter section, the adapter section is connected to the clamping arm by three rows of fasteners, the width of the adapter section is consistent with the width of the clamping arm and is greater than the width of the clamping section, the clamping section is connected to the adapter section by a transition section, the width of the transition section gradually expands from the end close to the clamping section to the end close to the adapter section, the connection between the transition section and the clamping section and the adapter section is rounded, and the radius of the rounded corner is consistent with the width of the clamping section.

[0016] The mounting seat is made of metal material and comprises a cylindrical body and a circular skirt, the cylindrical body penetrates through the through hole A, the outer diameter of the cylindrical body is matched with the diameter of the through hole A, the circular skirt is coaxially arranged on the outer wall of the cylindrical body and is riveted to the test area by a plurality of rivets.

[0017] The wall thickness of the cylindrical body and the thickness of the circular skirt are both 2mm-3mm.

[0018] The heating device comprises a pipeline heater and a heating pipe, the pipeline heater is electrically connected to the controller, the heating pipe is inserted into the inner hole of the mounting seat, and the heating pipe is connected to the pipeline heater through the medium conveying pipe and the medium return pipe.

[0019] The data acquisition assembly comprises a data acquisition instrument and four strain gauges, the data acquisition instrument is electrically connected with the controller, the four strain gauges are electrically connected with the data acquisition instrument, the four strain gauges are correspondingly arranged on the four clamping arms, and the strain gauges are located between the test area and the adapter fixture.

[0020] A test method of a composite material nacelle mounting seat high-temperature fatigue test system, comprising the following steps:

[0021] Step one, place the test piece on the test platform of the biaxial fatigue test device, and connect the four actuating cylinders on the biaxial fatigue test device with the adapter fixture of the test piece one by one;

[0022] Step two, install the four strain gauges on the test piece, and insert the heating pipe into the mounting seat, and then start the pipeline heater to heat the mounting seat;

[0023] Step three, after the temperature of the mounting seat rises to the required temperature, start the data acquisition instrument to start data acquisition, and start the biaxial fatigue test device to apply force load to the test piece until the test piece is damaged.

[0024] The beneficial effects of the present application are:

[0025] 1. The test piece is heated by the heating device to simulate the high-temperature working condition of the test piece, the test piece is loaded by the biaxial fatigue test device, and the strain data of the test piece during the test is collected by the data acquisition assembly, so as to realize the biaxial tensile fatigue test of the composite material nacelle mounting seat, and verify the high-temperature fatigue performance of the composite material nacelle mounting seat under the action of internal pressure and axial force.

[0026] 2. The test piece is used to carry out the high-temperature fatigue test of the composite material nacelle mounting seat, and the test data obtained can effectively reflect the high-temperature fatigue performance of the actual structure, without the need to process a complete nacelle structure for testing, thereby significantly saving the test cost and improving the convenience and efficiency of the test operation. DETAILED DESCRIPTION

[0027] Figure 1 It is a structural schematic diagram of the present application;

[0028] Figure 2 It is a front view structural schematic diagram of the test piece of the present application;

[0029] Figure 3 It is a bottom view structural schematic diagram of the test piece of the present application;

[0030] Figure 4 It is a design flowchart of the test piece of the present application.

[0031] In the figure: 1-Biaxial fatigue testing device, 2-Test piece, 20-Test piece body, 200-Clamping arm, 21-Test area, 22-Mounting base, 23-Rivet, 24-Adapter fixture, 240-Padded block, 241-Clamping plate, 25-Fastener, 3-Heating device, 30-Pipe heater, 31-Heating tube, 32-Medium delivery tube, 33-Medium return tube, 4-Data acquisition component, 5-Controller. Detailed Implementation

[0032] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0033] like Figures 1 to 3 As shown, the high-temperature fatigue testing system for a composite material casing mount according to the present invention includes a biaxial fatigue testing device 1, a test piece 2, a heating device 3, a data acquisition component 4, and a controller 5. The test piece 2 is mounted on the biaxial fatigue testing device 1. The heating device 3 and the data acquisition component 4 are both connected to the test piece 2. The controller 5 is electrically connected to the biaxial fatigue testing device 1, the heating device 3, and the data acquisition component 4, respectively. In use, the heating device 3 heats the test piece 2 to simulate the high-temperature working conditions of the test piece 2. The biaxial fatigue testing device 1 applies biaxial loading to the test piece 2. The data acquisition component 4 collects the strain data of the test piece 2 during the test, thereby realizing a biaxial tensile fatigue test on the composite material casing mount to verify the high-temperature fatigue performance of the composite material outer casing mount under the dual action of internal pressure and axial force.

[0034] The biaxial fatigue testing device 1 is a biaxial tensile testing machine, specifically a biaxial tensile material fatigue testing machine.

[0035] To address the high-temperature fatigue failure of the composite material outer bypass casing of an aero-engine at the mounting base 22, this invention provides a test piece 2 that can effectively verify and study the fatigue performance of the composite material outer bypass casing near the mounting base 22 under real load conditions.

[0036] The test piece 2 includes a test piece body 20 and a mounting base 22. The test piece body 20 is cross-shaped, and each of the four ends of the test piece body 20 is provided with a transition clamp 24. A test area 21 is provided on the test piece body 20 at the intersection of the cross shape. A through hole A is opened in the test area 21 along the thickness direction. The mounting base 22 passes through the through hole A and is riveted to the test area 21 by multiple rivets 23.

[0037] The test specimen body 20 includes four clamping arms 200, one end of each of the four clamping arms 200 being connected together to form a cross-shaped test specimen body 20.

[0038] The clamping arm 200 is rectangular, the test area 21 is circular, and the diameter of the test area 21 is consistent with the width of the clamping arm 200.

[0039] The composite material layer mode of the clamping arm 200 is consistent with the material layer mode of the outer containment casing shell.

[0040] The test area 21 is thickened relative to the clamping arm 200, and the composite material layer mode of the test area 21 is consistent with the material layer mode of the outer containment casing shell at the mounting seat 22.

[0041] The adapter clamp 24 includes a cushion block 240 and two clamp plates 241, the cushion block 240 is placed between the two clamp plates 241, one end of the two clamp plates 241 is connected to the end of the clamping arm 200 away from the test area 21 through a plurality of fasteners 25, and the clamping arm 200 is located between the two clamp plates 241.

[0042] The clamp plate 241 includes a clamping section and an adapter section, the adapter section is connected to the clamping arm 200 through three rows of fasteners 25, the width of the adapter section is consistent with the width of the clamping arm 200 and is greater than the width of the clamping section, the clamping section is connected to the adapter section through a transition section, the width of the transition section gradually expands from the end close to the clamping section to the end close to the adapter section, the connection between the transition section and the clamping section and the adapter section is rounded, and the radius of the rounded corner is consistent with the width of the clamping section. In use, the fastener 25 includes a bolt, a spring pad, a flat pad, and a nut. The width of the clamping section is determined according to the width of the clamping block of the biaxial fatigue test device 1. The number of fasteners 25 in each row of the three rows of fasteners 25 is determined according to the simulation results.

[0043] The mounting seat 22 is made of a metal material and includes a cylindrical body and a circular skirt, the cylindrical body penetrates through the through hole A, and the outer diameter of the cylindrical body is adapted to the diameter of the through hole A, the circular skirt is coaxially arranged on the outer wall of the cylindrical body and is riveted to the test area 21 through a plurality of rivets 23.

[0044] The wall thickness of the cylindrical body and the thickness of the circular skirt are both 2mm-3mm.

[0045] The structural design process of the test piece 2 is as shown in Figure 4 The detailed structural size of the test piece 2 must be iterated with the strength evaluation to ensure that the stress / strain distribution of the test area 21 and the actual outer containment casing mounting seat near the shell are consistent.

[0046] The test piece 2 is used to carry out the high temperature fatigue test of the composite casing mounting seat, and the test data obtained can effectively reflect the high temperature fatigue performance of the actual structure, without the need to process a complete outer casing structure for testing, thereby significantly saving the test cost and improving the convenience and efficiency of the test operation.

[0047] The heating device 3 comprises a pipeline heater 30 and a heating pipe 31, the pipeline heater 30 is electrically connected with the controller 5, the heating pipe 31 is inserted into the inner hole of the mounting seat 22, and the heating pipe 31 is connected with the pipeline heater 30 through a medium conveying pipe 32 and a medium return pipe 33.

[0048] The data acquisition assembly 4 comprises a data acquisition instrument and four strain gauges, the data acquisition instrument is electrically connected with the controller 5, the four strain gauges are electrically connected with the data acquisition instrument, the four strain gauges are one-to-one corresponding arranged on the four clamping arms 200, and the strain gauges are located between the test area 21 and the adapter clamp 24.

[0049] A test method of a high temperature fatigue test system of a composite casing mounting seat, comprising the following steps:

[0050] Step one, place the test piece 2 on the test platform of the biaxial fatigue test device 1, and connect the four actuating cylinders on the biaxial fatigue test device 1 with the adapter clamp 24 of the test piece 2 one-to-one. Before connecting the adapter clamp 24 with the actuating cylinder, first place the pad 240 between the two clamp plates 241.

[0051] Step two, install the four strain gauges on the test piece 2, and insert the heating pipe 31 into the mounting seat 22, and then start the pipeline heater 30 to heat the mounting seat 22.

[0052] Step three, after the temperature of the mounting seat 22 rises to the required temperature, start the data acquisition instrument to start data acquisition, and start the biaxial fatigue test device 1 to apply force load to the test piece 2 until the test piece 2 is damaged. In use, the four actuating cylinders on the biaxial fatigue test device 1 apply force load to the test piece 2.

Claims

1. A composite case mount high temperature fatigue test system, characterized by: The utility model provides a kind of double-axial fatigue test device, including double-axial fatigue test device (1), test piece (2), heating device (3), data acquisition component (4) and controller (5), the test piece (2) is installed on double-axial fatigue test device (1), the heating device (3) and the data acquisition component (4) are connected with test piece (2), and the controller (5) is electrically connected with double-axial fatigue test device (1), heating device (3) and data acquisition component (4) respectively.

2. The composite material case mount high cycle fatigue test system of claim 1, wherein: The double-axial fatigue test device (1) is a double-axial tensile tester.

3. The composite material case mount high cycle fatigue test system of claim 1, wherein: The test piece (2) includes a test piece body (20) and a mounting seat (22). The test piece body (20) is cross-shaped. An adapter clamp (24) is arranged at each end of the test piece body (20). A test area (21) is arranged on the test piece body (20) at the cross-shaped intersection thereof. A through hole A is formed in the test area (21) along the thickness direction. The mounting seat (22) penetrates through the through hole A and is riveted to the test area (21) by a plurality of rivets (23).

4. The composite material case mount high cycle fatigue test system of claim 3, wherein: The test piece body (20) includes four clamping arms (200). One end of each clamping arm (200) is connected together to form the cross-shaped test piece body (20). The clamping arm (200) is rectangular, and the test area (21) is circular. The diameter of the test area (21) is consistent with the width of the clamping arm (200).

5. The composite material case mount high cycle fatigue test system of claim 4, wherein: The composite material layer mode of the clamping arm (200) is consistent with the material layer mode of the outer containment casing shell. The test area (21) is thickened relative to the clamping arm (200). The composite material layer mode of the test area (21) is consistent with the material layer mode of the outer containment casing shell at the mounting seat (22).

6. The composite material case mount high cycle fatigue test system of claim 4, wherein: The adapter clamp (24) includes a cushion block (240) and two clamp plates (241). The cushion block (240) is placed between the two clamp plates (241). One end of each clamp plate (241) is connected to the end of the clamping arm (200) away from the test area (21) by a plurality of fasteners (25). The clamping arm (200) is located between the two clamp plates (241). The clamp plate (241) includes a clamping section and an adapter section. The adapter section is connected to the clamping arm (200) by three rows of fasteners (25). The width of the adapter section is consistent with the width of the clamping arm (200) and is greater than the width of the clamping section. The clamping section is connected to the adapter section by a transition section. The width of the transition section gradually expands from the end close to the clamping section to the end close to the adapter section. The connection between the transition section and the clamping section and the adapter section is rounded, and the radius of the rounded corner is consistent with the width of the clamping section.

7. The composite material case mount high cycle fatigue test system of claim 3, wherein: The mounting seat (22) is made of metal material and includes a cylindrical body and a circular skirt. The cylindrical body penetrates through the through hole A, and the outer diameter of the cylindrical body is matched with the diameter of the through hole A. The circular skirt is coaxially arranged on the outer wall of the cylindrical body and is riveted to the test area (21) by a plurality of rivets (23). The wall thickness of the cylindrical body and the thickness of the circular skirt are both 2mm-3mm.

8. The composite material case mount high cycle fatigue test system of claim 3, wherein: The heating device (3) comprises a pipeline heater (30) and a heating pipe (31), the pipeline heater (30) is electrically connected with the controller (5), the heating pipe (31) is inserted into the inner hole of the mounting seat (22), and the heating pipe (31) is connected with the pipeline heater (30) through the medium conveying pipe (32) and the medium return pipe (33).

9. The composite material case mount high cycle fatigue test system of claim 4, wherein: The data acquisition assembly (4) comprises a data acquisition instrument and four strain gauges, the data acquisition instrument is electrically connected with the controller (5), the four strain gauges are electrically connected with the data acquisition instrument, the four strain gauges are arranged on the four clamping arms (200) in one-to-one correspondence, and the strain gauges are located between the test area (21) and the adapter clamp (24).

10. A test method for a composite material case mount high temperature fatigue test system, characterized in that: The method comprises the following steps: Step one, place the test piece (2) on the test platform of the biaxial fatigue test device (1), and connect the four actuators on the biaxial fatigue test device (1) with the adapter clamp (24) of the test piece (2) in one-to-one correspondence; Step two, install the four strain gauges on the test piece (2), and insert the heating pipe (31) into the mounting seat (22), then start the pipeline heater (30) to heat the mounting seat (22); Step three, after the temperature of the mounting seat (22) rises to the required temperature, start the data acquisition instrument to start data acquisition, and start the biaxial fatigue test device (1) to apply force load to the test piece (2) until the test piece (2) is damaged.

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