Special-shaped test piece fatigue test loading device and loading method

Abstract

The invention provides a special-shaped test piece fatigue test loading device. The special-shaped test piece fatigue test loading device comprises an upper connector, a lower connector, a main shaft, a transverse shaft, a lower connector transverse shaft, a clamping plate, a bolt, a support and a clamping block. The test piece is connected through the main shaft and the two transverse shafts, and the support and the test piece are connected through the clamping plates and the bolts. The pull rods on the single-lug upper connector and the double-lug lower connector are clamped on an electro-hydraulic servo fatigue testing machine, and loading of a test piece is achieved through pulling and pressing of the testing machine on the lugs of the upper connector. The strain measuring device comprises a strain gauge and a signal transmission processing device, and the strain gauge is installed on a main examination part of the test piece according to test requirements. Through the fatigue test device, accurate load application of the special-shaped structural member is realized, and a fatigue test is completed.

Description

Technical Field

[0001] The invention belongs to the field of fatigue test design for special-shaped parts, and in particular relates to a fatigue test loading device and a loading method for special-shaped test parts. Background Art

[0002] Fatigue test is a common method to measure the SN curve of materials, which can obtain data such as the stress-life curve of the material.

[0003] At present, the fatigue testing technology of landing gear turning crossbeam special-shaped structural parts is in its infancy, and there are still few fatigue testing technologies for landing gear turning crossbeam special-shaped structural parts.

[0004] Usually, a large truss test frame needs to be built to carry out fatigue testing of special-shaped landing gear structural parts. The structure is complex, the cost is high, and the test period is long. There is an urgent need for a test loading device and test method with a simple and reliable structure, low cost and easy implementation. Summary of the Invention

[0005] The purpose of the present invention is to provide a fatigue test loading device and test method for special-shaped test pieces, which can realize fatigue testing of special-shaped landing gear structural parts without building a large truss test frame, and complete fatigue testing. The structure is simple and reliable, the cost is low, and the implementation is convenient.

[0006] The first aspect of the present invention provides a fatigue test loading device for a special-shaped test piece, comprising: an upper joint 1, a main shaft 3, a transverse shaft 4, a clamping plate 6, a bolt 7, a support 8, a first clamping block 9, and a second clamping block 10;

[0007] The first clamping block 9 and the second clamping block 10 are S-shaped and arranged side by side. The lower groove is used to clamp the support 8, and the upper groove is used to clamp the test piece.

[0008] A through hole is provided at the bottom of the groove above the first clamping block 9, and the main shaft 3 passes through the main through hole on the test piece and the through hole;

[0009] The horizontal axis 4 passes through a horizontal through hole on the test piece;

[0010] The end of the main shaft 3 passing through the through hole and both ends of the horizontal shaft 4 are clamped and fixed by a clamping plate 6, a bolt 7 and a support 8;

[0011] The first clamping block 9 is fixed at the bottom;

[0012] The upper connector 1 is connected to the ear structure on one side of the main through hole of the test piece by a single or double ear;

[0013] The pull rod on the upper connector 1 is clamped on an electro-hydraulic servo fatigue testing machine, and the testing machine pulls and presses the lug of the upper connector 1 to load the test piece 11.

[0014] Optionally, the fatigue test loading device for a special-shaped test piece further includes: a lower joint 2;

[0015] The first clamping block 9 is provided with an ear structure, and the lower joint 2 is connected to the ear structure provided on the first clamping block 9 using a single-double ear structure;

[0016] The pull rod on the lower joint 2 is clamped on the electro-hydraulic servo fatigue testing machine, and the test piece 11 is fixed by the testing machine through pulling and pressing the ear piece of the lower joint 2.

[0017] Optionally, the fatigue test loading device for a special-shaped test piece further includes: a lower joint transverse axis 5;

[0018] A fixing hole parallel to the groove is provided at the groove below the first clamping block 9;

[0019] The lower joint transverse axis 5 passes through the lower joint 2 and the ear structure and the fixing hole provided on the first clamping block 9.

[0020] Optionally, the lower joint 2 is a double-ear structure.

[0021] Optionally, the upper connector 1 is a single-ear structure.

[0022] Optionally, the test piece 11 is an aircraft turning beam.

[0023] A second aspect of the present invention provides a loading method using the fatigue test loading device for a special-shaped test piece as described in any one of the first aspects, the method comprising:

[0024] Before the test begins, first install the lower connector 2 on the lower actuator cylinder of the electro-hydraulic servo actuator, connect the support 8 and the lower connector 2, and then fix the first clamping block 9 on the support 8 to provide support and limit the test piece 11;

[0025] Use bolts to connect the test piece 11, main shaft 3, and transverse shaft 4 to form a whole. Finally, adjust the upper actuator cylinder of the electro-hydraulic servo actuator to the appropriate position to complete the clamping of the upper joint 1. Install strain gauges on the part to be tested of the test piece 11 and connect the measuring equipment.

[0026] Optionally, the method further includes:

[0027] The test begins. The upper actuator cylinder of the electro-hydraulic servo actuator moves up and down, applying a load through the upper connector 1. Observe whether the loading device and the test piece 11 have obvious elastic deformation during the test. If not, it indicates that the test device can ensure the stiffness.

[0028] The fatigue test load is applied to the test piece 11 through the upper actuator cylinder of the electro-hydraulic servo actuator, the test piece 11 is deformed, and the strain data measured by the strain gauge meets the fatigue test requirements. The test is completed and the data is recorded.

[0029] Optionally, the method further includes:

[0030] Rotate the test piece to achieve balanced loading test on both sides of the test piece.

[0031] The present invention provides a fatigue test loading device and test method for a special-shaped test piece. The fatigue test device can realize accurate load application on the special-shaped structural part and complete the fatigue test, thereby filling the gap that fatigue tests of special-shaped structural parts are difficult to load. The test device can complete the fatigue test of the special-shaped structural part without building a large truss test frame, and the structure is simple, reliable, and easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the structure of the fatigue test device for special-shaped test pieces;

[0033] Figure 2 This is a structural diagram of the aircraft turning beam special-shaped structural parts;

[0034] Figure 3 Schematic diagram of the support;

[0035] Figure 4 Schematic diagram of the first clamping block;

[0036] Figure 5 is a schematic diagram of the second clamping block;

[0037] Description of reference numerals:

[0038] 1-upper joint, 2-lower joint, 3-main shaft, 4-transverse axis, 5-transverse axis of lower joint, 6-splint, 7-bolt, 8-support, 9-first clamping block, 10-second clamping block, 11-test piece. DETAILED DESCRIPTION

[0039] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0040] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed in order to provide a comprehensive understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific arrangement and method proposed below, but rather encompasses any improvements, replacements, and modifications to structures, methods, and devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, well-known structures and techniques are not shown to avoid unnecessary ambiguity in the present invention.

[0041] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "up," "down," "left," "right," "vertical," "horizontal," "inside," and "outside" are based on the directions or positional relationships described in the accompanying drawings and are intended only to facilitate and simplify the description of the present invention and should not be construed as limiting the present invention. Furthermore, the use of ordinal numbers (e.g., "first and second," etc.) is intended to distinguish between objects and is not limited to this order, and should not be construed as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may refer to direct connection or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention.

[0043] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] The present invention will be described in further detail below with reference to the embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0045] like Figure 1-5 As shown, the present invention relates to a fatigue test loading device for special-shaped structural parts, which is used for fatigue testing of special-shaped structural parts. It is characterized in that the test device includes an upper joint 1, a lower joint 2, a main shaft 3, a transverse shaft 4, a lower joint transverse shaft 5, a clamping plate 6, a bolt 7, a support 8, and a first clamping block 9.

[0046] The first clamping block 9 and the second clamping block 10 are S-shaped and arranged side by side. The lower groove is used to clamp the support 8, and the upper groove is used to clamp the test piece.

[0047] A through hole is provided at the bottom of the groove above the first clamping block 9, and the main shaft 3 passes through the main through hole on the test piece and the through hole;

[0048] The horizontal axis 4 passes through a horizontal through hole on the test piece;

[0049] The end of the main shaft 3 passing through the through hole and both ends of the horizontal shaft 4 are clamped and fixed by a clamping plate 6, a bolt 7 and a support 8;

[0050] The first clamping block 9 is fixed at the bottom;

[0051] The upper connector 1 is connected to the ear structure on one side of the main through hole of the test piece by a single or double ear;

[0052] The pull rod on the upper connector 1 is clamped on an electro-hydraulic servo fatigue testing machine, and the testing machine pulls and presses the lug of the upper connector 1 to load the test piece 11.

[0053] Optionally, the fatigue test loading device for a special-shaped test piece further includes: a lower joint 2;

[0054] The first clamping block 9 is provided with an ear structure, and the lower joint 2 is connected to the ear structure provided on the first clamping block 9 using a single-double ear structure;

[0055] The pull rod on the lower joint 2 is clamped on the electro-hydraulic servo fatigue testing machine, and the test piece 11 is fixed by the testing machine through pulling and pressing the ear piece of the lower joint 2.

[0056] Optionally, the fatigue test loading device for a special-shaped test piece further includes: a lower joint transverse axis 5;

[0057] A fixing hole parallel to the groove is provided at the groove below the first clamping block 9;

[0058] The lower joint transverse axis 5 passes through the lower joint 2 and the ear structure and the fixing hole provided on the first clamping block 9.

[0059] The lower joint 2 is a double-ear structure, and the upper joint 1 is a single-ear structure. The test piece 11 is an aircraft turning beam.

[0060] The present invention provides a loading method of a fatigue test loading device for a special-shaped test piece, the method comprising:

[0061] Before the test begins, first install the lower connector 2 on the lower actuator cylinder of the electro-hydraulic servo actuator, connect the support 8 and the lower connector 2, and then fix the first clamping block 9 on the support 8 to provide support and limit the test piece 11;

[0062] Use bolts to connect the test piece 11, main shaft 3, and transverse shaft 4 to form a whole. Finally, adjust the upper actuator cylinder of the electro-hydraulic servo actuator to the appropriate position to complete the clamping of the upper joint 1. Install strain gauges on the part to be tested of the test piece 11 and connect the measuring equipment.

[0063] The test begins. The upper actuator cylinder of the electro-hydraulic servo actuator moves up and down, applying a load through the upper connector 1. Observe whether the loading device and the test piece 11 have obvious elastic deformation during the test. If not, it indicates that the test device can ensure the stiffness.

[0064] The fatigue test load is applied to the test piece 11 through the upper actuator cylinder of the electro-hydraulic servo actuator, the test piece 11 is deformed, and the strain data measured by the strain gauge meets the fatigue test requirements. The test is completed and the data is recorded.

[0065] Optionally, the test piece is rotated to achieve a balanced loading test on both sides of the test piece.

[0066] Exemplarily, the test piece 11 is connected via the main shaft 3 , the transverse shaft 4 and the lower joint transverse shaft 5 , and the connection between the support 8 and the test piece 11 is completed via the clamping plate 6 and the bolt 7 .

[0067] The single-ear upper connector 1 is a single-ear type, while the lower connector 2 is a double-ear type. The pull rods on the upper and lower connectors 1 and 2 are clamped on an electro-hydraulic servo fatigue testing machine. The machine applies tension and compression to the two lugs of the upper and lower connectors to load the test piece 11. The strain measurement device includes strain gauges and a signal transmission and processing device. The strain gauges are installed on the main test areas of the test piece according to the test requirements. The operation method and principle are as follows:

[0068] Before the test begins, first install the lower joint 2 on the lower actuator cylinder of the electro-hydraulic servo actuator, connect the support 8 and the lower joint 2 through the lower joint horizontal axis 5, and then fix the first clamp 9 on the support 8 to provide support and limit the test piece 11; use bolts to connect the test piece 11, the main shaft 3, and the horizontal axis 4 to form a whole, and finally adjust the upper actuator cylinder of the electro-hydraulic servo actuator to the appropriate position to complete the clamping of the upper joint 1, install strain gauges on the main test parts of the test piece 11 and connect the measuring equipment.

[0069] The test was started, and the upper actuator cylinder of the electro-hydraulic servo actuator applied the load by moving up and down. There was no obvious elastic deformation of the test device during the test, indicating that the test device could ensure the rigidity. The fatigue test load was applied to the test piece 11, and the test piece 11 was deformed. The strain data measured by the strain gauge met the fatigue test requirements. The test was completed and the data was recorded.

[0070] The above specific implementation methods are detailed descriptions of the present invention. It cannot be considered that the specific implementation methods of the present invention are limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, they can make several simple deductions and substitutions without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. A fatigue test loading device for special-shaped test pieces, characterized in that: It comprises: an upper joint (1), a main shaft (3), a transverse shaft (4), a clamping plate (6), a bolt (7), a support (8), a first clamping block (9), and a second clamping block (10); The first clamping block (9) and the second clamping block (10) are S-shaped and arranged side by side, with the lower groove being used to clamp the support (8) and the upper groove being used to clamp the test piece; A through hole is provided at the bottom of the groove above the first clamping block (9), and the main shaft (3) passes through the main through hole on the test piece and the through hole; The horizontal axis (4) passes through a horizontal through hole on the test piece; One end of the main shaft (3) passing through the through hole and both ends of the transverse shaft (4) are clamped and fixed by a clamping plate (6), a bolt (7) and a support (8); The first clamping block (9) is fixedly arranged at the bottom; The upper joint (1) is connected to the ear piece structure on one side of the main through hole of the test piece by a single or double ear; The pull rod on the upper joint (1) is clamped on an electro-hydraulic servo fatigue testing machine, and the testing machine pulls and presses the ear piece of the upper joint (1) to achieve loading on the test piece (11).

2. The fatigue test loading device for special-shaped test pieces according to claim 1, characterized in that: Also includes: Lower connector (2); The first clamping block (9) is provided with an ear structure, and the lower joint (2) is connected to the ear structure provided on the first clamping block (9) using a single-double ear structure; The pull rod on the lower joint (2) is clamped on an electro-hydraulic servo fatigue testing machine, and the test piece (11) is fixed by the testing machine through pulling and pressing the ear piece of the lower joint (2).

3. The fatigue test loading device for special-shaped test pieces according to claim 2, characterized in that: Also includes: Lower joint transverse axis (5); A fixing hole parallel to the groove is provided at the groove below the first clamping block (9); The lower joint transverse axis (5) passes through the lower joint (2) and the ear structure and the fixing hole provided on the first clamping block (9).

4. The fatigue test loading device for special-shaped test pieces according to claim 2, characterized in that: The lower joint (2) is a double-ear structure.

5. The fatigue test loading device for special-shaped test pieces according to claim 2, characterized in that: The upper joint (1) is a single-ear structure.

6. The fatigue test loading device for special-shaped test pieces according to claim 2, characterized in that: The test piece (11) is an aircraft turning beam.

7. A loading method using the fatigue test loading device for a special-shaped test piece according to any one of claims 2 to 6, characterized in that: The method comprises: Before the test begins, the lower joint (2) is first installed on the lower actuator cylinder of the electro-hydraulic servo actuator, the support (8) and the lower joint (2) are connected, and then the first clamping block (9) is fixed on the support (8) to provide support and limit for the test piece (11); The test piece (11), the main shaft (3), and the transverse shaft (4) are connected together by bolts to form a whole. Finally, the upper actuator cylinder of the electro-hydraulic servo actuator is adjusted to a suitable position to complete the clamping of the upper joint (1). The strain gauge is installed on the part to be tested of the test piece (11) and the measuring equipment is connected.

8. The loading method according to claim 7, characterized in that: The method further comprises: The test is started. The upper actuator cylinder of the electro-hydraulic servo actuator moves up and down, and a load is applied through the upper joint (1). The loading device and the test piece (11) are observed to see if there is any obvious elastic deformation during the test. If not, it means that the test device can ensure the rigidity. The fatigue test load is applied to the test piece (11) through the upper actuator cylinder of the electro-hydraulic servo actuator, the test piece (11) is deformed, the strain data measured by the strain gauge meets the fatigue test requirements, the test is completed, and the data is recorded.

9. The loading method according to claim 7, characterized in that: The method further comprises: Rotate the test piece to achieve balanced loading test on both sides of the test piece.

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