Fatigue test loading device and method

Abstract

The invention provides a fatigue test loading device and method. The device comprises a loading disc, a loading beam, a pin, a loading connector a, a transverse shaft, a loading connector b, a side support, a loading connector c, a side shaft, a loading connector d, a loading connector e, an actuator cylinder, a bottom plate, an actuator cylinder base, a connecting assembly, a support, a supporting frame and a test piece. According to the stress state of the tail reduction supporting frame on a helicopter, the fatigue test loading device and method are designed, the complex load loading requirement of the tail reduction supporting frame can be met, and the purpose of examining the fatigue performance of the tail reduction supporting frame is achieved.

Description

Technical Field

[0001] The present application belongs to the technical field of fatigue test of helicopter tail reduction support frame, and specifically relates to a fatigue test loading device and method. Background Art

[0002] The tail dagger support frame is an important load-bearing component of the helicopter. The stress environment is complex. In order to understand the strength and fatigue life of the tail dagger support frame, it is necessary to test the tail dagger support frame, obtain the fatigue characteristics of the tail dagger support frame, and then give the life of the tail dagger support frame. When testing the tail dagger support frame, the stress state of the tail dagger support frame on the helicopter must be simulated.

[0003] At present, there is no test device similar to this scheme in my country, and no relevant public literature from abroad has been retrieved. Summary of the invention

[0004] The purpose of the present invention is to design a fatigue test loading device and method according to the stress state of the tail reduction support frame on the helicopter, which can meet the complex load loading requirements of the tail reduction support frame and achieve the purpose of evaluating the fatigue performance of the tail reduction support frame.

[0005] In a first aspect, the present application provides a fatigue test loading device, the device comprising: a loading plate 1, a loading beam 2, a pin 3, a loading joint a4, a transverse axis 5, a loading joint b6, a side support 7, a loading joint c8, a side axis 9, a loading joint d10, a loading joint e11, an actuator 12, a bottom plate 13, an actuator base 14, a connecting assembly 15, a bracket 16, a support frame 17, and a test piece 18;

[0006] Among them, the bottom of the support frame 17 has a hole, the bottom plate 13 has a hole, and the support frame 17 is fixed to the bottom plate 13 by bolts;

[0007] The test piece 18 has a hole on the right side, and the support frame 17 has a hole, and the test piece 18 and the support frame 17 are fixed to the support frame 17 by bolts;

[0008] There is a hole on the loading plate 1, and there is a hole on the left side of the test piece 18. The loading plate 1 is connected to the test piece 18 by bolts;

[0009] There is a hole on the side of the loading beam 2, and the loading plate 1 is inserted into the hole on the side of the loading beam 2; there is a pin hole on the loading beam 2, and there is a pin hole on the loading plate 1, and the loading beam 2 and the loading plate 1 are fixed by pins 3;

[0010] The loading plate 1 has a hole, and the horizontal axis 5 is inserted into the hole of the loading plate 1;

[0011] The loading joint a4 and the loading joint b6 have holes, and the loading joint a4 and the loading joint b6 are connected to the horizontal axis 5 through the holes;

[0012] The loading beam 2 has a hole, the side support 7 has a hole, and the loading beam 2 and the side support 7 are connected by bolts;

[0013] The side support 7 is provided with a hole, and the side shaft 9 is inserted into the side support 7;

[0014] The loading joints c8, d10 and e11 are provided with holes, and the loading joints c8, d10 and e11 are connected to the side shaft 9 through the holes;

[0015] The actuator 12 is a power source for applying the load. The actuator 12 is connected to the loading joint a4, the loading joint b6, the loading joint c8, the loading joint d10, and the loading joint e11 through threads for applying the load.

[0016] The actuator 12 is connected to the actuator base 14 by bolts, and the actuator base 14 is fixed to the bottom plate 13 by bolts;

[0017] The actuator 12 is fixed on the bracket 16 through the connecting assembly 15.

[0018] Preferably, the loading beam 2 and the loading plate 1 are integrated or fixed by welding.

[0019] Preferably, spherical bearings are installed on the loading joints a4 and b6.

[0020] Preferably, spherical bearings are installed on the loading joints c8, d10 and e11.

[0021] Preferably, the side support 7 and the loading beam 2 are integrated or connected by welding.

[0022] Preferably, the loading plate 1 and the transverse shaft 5 are integrated or connected by welding.

[0023] Preferably, the side support 7 and the side shaft 9 are integrally formed or connected by welding.

[0024] In a second aspect, the present application also provides a fatigue test loading method, the method comprising:

[0025] Step 1, fix the test piece 18 on the support frame 17 by bolts;

[0026] Step 2: There is a hole on the loading plate 1, and there is a hole on the left side of the test piece 18. The loading plate 1 is connected to the test piece 18 by bolts;

[0027] Step 3: There is a hole on the side of the loading beam 2, and the loading plate 1 is inserted into the hole on the side of the loading beam 2; there is a pin hole on the loading beam 2, and there is a pin hole on the loading plate 1, and the loading beam 2 and the loading plate 1 are fixed by pins 3;

[0028] Step 4, the loading plate 1 has a hole, and the horizontal axis 5 is inserted into the hole of the loading plate 1; the loading joint a4 and the loading joint b6 have holes, and the loading joint a4 and the loading joint b6 are connected to the horizontal axis 5 through the holes; the loading beam 2 has a hole, and the side support 7 has a hole, and the loading beam 2 and the side support 7 are connected by bolts; the side support 7 has a hole, and the side axis 9 is inserted into the side support 7; the loading joints c8, the loading joints d10, and the loading joints e11 have holes, and the loading joints c8, the loading joints d10, and the loading joints e11 are connected to the side axis 9 through the holes;

[0029] Step 5, there are 5 actuators 12, and the actuators 12 are respectively connected to the loading joint a4, the loading joint b6, the loading joint c8, the loading joint d10, and the loading joint e11 through threads for applying load;

[0030] Step 6, four actuators 12 are connected to four actuator bases 14 by bolts, and the actuator bases 14 are fixed to the bottom plate 13 by bolts;

[0031] Step 7, one actuator 12 is fixed on the bracket 16 through the connecting assembly 15;

[0032] Step 8. In order to apply pure torque load, the distance between the center of loading joint a4 and the center of loading joint b6 and the center of loading plate 1 should be the same;

[0033] Step 9. To apply pure torque load, the center distances of loading joints c8 and d10 from the center of loading joint e11 should be the same;

[0034] Step 10: Carry out load debugging to determine the test state that meets the fatigue test load;

[0035] Conduct fatigue test according to the specified load;

[0036] Monitor the test load during the test to ensure that it meets the test requirements;

[0037] During the test, the test load, number of test cycles and test damage were recorded.

[0038] This application has the following technical effects:

[0039] The invention has a simple structure and is easy to assemble and disassemble, and can meet the load loading requirements during the fatigue test of the tail reduction support frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the overall structure of the device provided in the embodiment of the present application;

[0041] Figure 2 It is a partial structural schematic diagram of the device provided in the embodiment of the present application;

[0042] Figure 3 It is a cross-sectional view of the device provided in the embodiment of the present application. DETAILED DESCRIPTION

[0043] See also Figure 1-Figure 3 A fatigue test loading device is provided, including: a loading plate 1, a loading beam 2, a pin 3, a loading joint a4, a transverse axis 5, a loading joint b6, a side support 7, a loading joint c8, a side axis 9, a loading joint d10, a loading joint e11, an actuator 12, a base plate 13, an actuator base 14, a connecting assembly 15, a bracket 16, a support frame 17, and a test piece 18.

[0044] The bottom of the support frame 17 has a hole, the bottom plate 13 has a hole, and the support frame 17 is fixed to the bottom plate 13 by bolts.

[0045] There is a hole on the right side of the test piece 18 and there is a hole on the support frame 17. The test piece 18 and the support frame 17 are fixed to the support frame 17 by bolts.

[0046] There is a hole on the loading plate 1, and there is a hole on the left side of the test piece 18. The loading plate 1 is connected to the test piece 18 by bolts.

[0047] There is a hole on the side of the loading beam 2, and the loading plate 1 is inserted into the hole on the side of the loading beam 2; there is a pin hole on the loading beam 2, and there is a pin hole on the loading plate 1, and the loading beam 2 and the loading plate 1 are fixed by pins 3.

[0048] The loading disk 1 has a hole, and the horizontal axis 5 is inserted into the hole of the loading disk 1.

[0049] The loading joint a4 and the loading joint b6 have holes, and the loading joint a4 and the loading joint b6 are connected to the horizontal axis 5 through the holes.

[0050] The loading beam 2 has a hole, and the side support 7 has a hole, and the loading beam 2 and the side support 7 are connected by bolts.

[0051] The side support seat 7 is provided with a hole, and the side shaft 9 is inserted into the side support seat 7 .

[0052] The loading joint c8, the loading joint d10 and the loading joint e11 are provided with holes, and the loading joint c8, the loading joint d10 and the loading joint e11 are connected to the side shaft 9 through the holes.

[0053] There are 5 actuators 12, which are the power source for applying the load. The actuators 12 are respectively connected to the loading joints a4, b6, c8, d10 and e11 through threads for applying the load.

[0054] The four actuators 12 are connected to the four actuator bases 14 by bolts, and the actuator bases 14 are fixed to the bottom plate 13 by bolts.

[0055] An actuator 12 is fixed on a bracket 16 via a connecting assembly 15 .

[0056] In a possible embodiment, the loading plate 1 and the loading beam 2 may be connected by welding, or may be integrated.

[0057] In a possible embodiment, spherical bearings are installed on the loading joints a4 and b6 to make the rotation more flexible and smooth.

[0058] In a possible embodiment, spherical bearings are installed on the loading joints c8, d10, and e11 to make the rotation more flexible and smooth.

[0059] In a possible embodiment, the side support 7 and the loading beam 2 may be integrated or connected by welding.

[0060] In a possible embodiment, the loading plate 1 and the transverse shaft 5 may be integrated or connected by welding.

[0061] In a possible embodiment, the side support 7 and the side shaft 9 may be integrated or connected by welding.

[0062] In other embodiments of the present application, a loading method is provided, including the following process:

[0063] Step 1

[0064] The test piece 18 is fixed to the support frame 17 by bolts. To ensure the connection is stable and the bolts are evenly stressed, the bolt tightening torque needs to be uniform.

[0065] Step 2

[0066] There is a hole on the loading plate 1, and there is a hole on the left side of the test piece 18. The loading plate 1 is connected to the test piece 18 by bolts. In order to ensure a stable connection and uniform force on the bolts, the tightening torque of the bolts needs to be 1.

[0067] Step 3

[0068] There is a hole on the side of the loading beam 2, and the loading plate 1 is inserted into the hole on the side of the loading beam 2; there is a pin hole on the loading beam 2, and there is a pin hole on the loading plate 1, and the loading beam 2 and the loading plate 1 are fixed by pins 3.

[0069] Step 4

[0070] The loading disk 1 has a hole, and the horizontal axis 5 is inserted into the hole of the loading disk 1.

[0071] The loading joint a4 and the loading joint b6 have holes, and the loading joint a4 and the loading joint b6 are connected to the horizontal axis 5 through the holes.

[0072] The loading beam 2 has a hole, and the side support 7 has a hole, and the loading beam 2 and the side support 7 are connected by bolts.

[0073] The side support seat 7 is provided with a hole, and the side shaft 9 is inserted into the side support seat 7 .

[0074] The loading joint c8, the loading joint d10 and the loading joint e11 are provided with holes, and the loading joint c8, the loading joint d10 and the loading joint e11 are connected to the side shaft 9 through the holes.

[0075] Step 5

[0076] There are five actuators 12, and the actuators 12 are respectively connected to the loading joint a4, the loading joint b6, the loading joint c8, the loading joint d10, and the loading joint e11 through threads for applying load.

[0077] Step 6

[0078] The four actuators 12 are connected to the four actuator bases 14 by bolts, and the actuator bases 14 are fixed to the bottom plate 13 by bolts.

[0079] Step 7

[0080] An actuator 12 is fixed on a bracket 16 via a connecting assembly 15 .

[0081] Step 8

[0082] In order to apply a pure torque load, the distance between the center of the loading joint a4 and the center of the loading joint b6 and the center of the loading plate 1 should be the same.

[0083] Step 9

[0084] In order to apply pure torque load, the center distances of loading joints c8 and d10 from the center of loading joint e11 should be the same.

[0085] Step 10

[0086] a) Carry out load debugging to determine the test state that meets the fatigue test load;

[0087] b) Conduct fatigue test according to the specified load;

[0088] c) Monitor the test load during the test to ensure that it meets the test requirements;

[0089] d) During the test, record the test load, number of test cycles, test damage, etc.

[0090] Step 11

[0091] According to the test termination conditions, the test is terminated when cracks appear on the test piece.

[0092] Step 12

[0093] After the test, write a test report as required

[0094] a) Test piece number, test completion time, test installation photos and test environment description;

[0095] b) Number of test cycles and loading frequency;

[0096] c) Records of inspection of the test piece during the test;

[0097] d) Test results and failure location, photos, schematic diagram of crack fracture direction and corresponding number of test cycles;

[0098] e) Experimental error analysis.

Claims

1. A fatigue test loading device, characterized in that: The device comprises: a loading plate (1), a loading beam (2), a pin (3), a loading joint a (4), a transverse axis (5), a loading joint b (6), a side support (7), a loading joint c (8), a side axis (9), a loading joint d (10), a loading joint e (11), an actuator (12), a base plate (13), an actuator base (14), a connecting assembly (15), a bracket (16), a support frame (17), and a test piece (18); The support frame (17) has a hole at the bottom, the bottom plate (13) has a hole, and the support frame (17) is fixed to the bottom plate (13) by bolts; The test piece (18) has a hole on the right side, and the support frame (17) has a hole, and the test piece (18) and the support frame (17) are fixed to the support frame (17) by bolts; The loading plate (1) has a hole, the left side of the test piece (18) has a hole, and the loading plate (1) is connected to the test piece (18) by bolts; The side of the loading beam (2) is provided with a hole, and the loading plate (1) is inserted into the side hole of the loading beam (2); the loading beam (2) is provided with a pin hole, and the loading plate (1) is provided with a pin hole, and the loading beam (2) and the loading plate (1) are fixed by a pin (3); The loading plate (1) has a hole, and the transverse axis (5) is inserted into the hole of the loading plate (1); The loading joint a (4) and the loading joint b (6) have holes, and the loading joint a (4) and the loading joint b (6) are connected to the horizontal axis (5) through the holes; The loading beam (2) has a hole, the side support (7) has a hole, and the loading beam (2) and the side support (7) are connected by bolts; A hole is formed on the side support (7), and the side shaft (9) is inserted into the side support (7); The loading joint c (8), the loading joint d (10), and the loading joint e (11) are provided with holes, and the loading joint c (8), the loading joint d (10), and the loading joint e (11) are connected to the side shaft (9) through the holes; The actuator (12) is a power source for applying the load. The actuator (12) is connected to the loading joint a (4), the loading joint b (6), the loading joint c (8), the loading joint d (10), and the loading joint e (11) through threads for applying the load. The actuator (12) is connected to the actuator base (14) by bolts, and the actuator base (14) is fixed to the bottom plate (13) by bolts; The actuator (12) is fixed on the bracket (16) through a connecting assembly (15).

2. A fatigue test loading device according to claim 1, characterized in that: The loading beam (2) and the loading plate (1) are integrated or fixed by welding.

3. A fatigue test loading device according to claim 2, characterized in that: Spherical bearings are installed on the loading joint a (4) and the loading joint b (6).

4. A fatigue test loading device according to claim 3, characterized in that: Spherical bearings are installed on the loading joint c (8), the loading joint d (10) and the loading joint e (11).

5. A fatigue test loading device according to claim 4, characterized in that: The side support (7) and the loading beam (2) are integrally formed or connected by welding.

6. A fatigue test loading device according to claim 5, characterized in that: The loading plate (1) and the transverse shaft (5) are integrally formed or connected by welding.

7. A fatigue test loading device according to claim 6, characterized in that: The side support (7) and the side shaft (9) are integrally formed or connected by welding.

8. A fatigue test loading method, characterized in that: The method comprises: Step 1, fix the test piece (18) on the support frame (17) by bolts; Step 2: There is a hole on the loading plate (1), there is a hole on the left side of the test piece (18), and the loading plate (1) is connected to the test piece (18) by bolts; Step 3: There is a hole on the side of the loading beam (2), and the loading plate (1) is inserted into the hole on the side of the loading beam (2); there is a pin hole on the loading beam (2), and there is a pin hole on the loading plate (1), and the loading beam (2) and the loading plate (1) are fixed by pins (3); Step 4: The loading plate (1) has a hole, and the transverse axis (5) is inserted into the hole of the loading plate (1); the loading joint a (4) and the loading joint b (6) have holes, and the loading joint a (4) and the loading joint b (6) are connected to the transverse axis (5) through the holes; the loading beam (2) has a hole, and the side support (7) has a hole, and the loading beam (2) and the side support (7) are connected by bolts; the side support (7) has a hole, and the side axis (9) is inserted into the side support (7); the loading joint c (8), the loading joint d (10), and the loading joint e (11) have holes, and the loading joint c (8), the loading joint d (10), and the loading joint e (11) are connected to the side axis (9) through the holes; Step 5, there are 5 actuators (12), and the actuators (12) are connected to the loading joint a (4), the loading joint b (6), the loading joint c (8), the loading joint d (10), and the loading joint e (11) through threads, respectively, for applying loads; Step 6: The four actuators (12) are connected to the four actuator bases (14) by bolts, and the actuator bases (14) are fixed to the base plate (13) by bolts; Step 7, one actuator (12) is fixed on the bracket (16) through the connecting assembly (15); Step 8. To apply a pure torque load, the distances between the center of the loading joint a (4) and the center of the loading joint b (6) and the center of the loading plate (1) should be the same; Step 9. In order to apply a pure torque load, the distances between the centers of the loading joints c (8) and d (10) and the center of the loading joint e (11) should be the same; Step 10: Carry out load debugging to determine the test state that meets the fatigue test load; Conduct fatigue test according to the specified load; Monitor the test load during the test to ensure that it meets the test requirements; During the test, the test load, number of test cycles and test damage were recorded.

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