Four-point bending test fixture for mechanical property test of reinforced corner box

Abstract

The utility model relates to the field of mechanical property experiment research of load-bearing structures, in particular to a four-point bending test clamp for mechanical property test of a reinforced corner box, which comprises a loading component, a clamping component and a clamping component, the simulation machine body assembly is used for installing the reinforced angle box and simulating the actual structure of a machine body, the device can conveniently simulate the actual loading condition of the reinforced angle box and carry out a four-point bending loading test on the reinforced angle box, so that the mechanical property and the reliability of the reinforced angle box are comprehensively assessed and verified; besides, in the test operation process, the supporting column is positioned and installed in the supporting hole of the support, so that an operator can quickly and accurately install a test piece on the clamp, the working efficiency is high, and meanwhile, the accuracy and repeatability of a test result are ensured.

Description

Technical Field

[0001] The utility model relates to the field of mechanical performance experimental research of load-bearing structures, in particular to a four-point bending test fixture for strengthening mechanical performance testing of corner boxes. Background Art

[0002] In recent years, the demand for reinforced corner boxes used in aviation structural repair has increased dramatically. At present, the selective laser melting forming technology has overturned the traditional process to a certain extent. It integrates computer-aided design, material processing and forming technologies, and has the advantages of high flexibility, fast response speed, and high material utilization. Using selective laser melting forming technology to replace traditional processes to prepare reinforced corner boxes can effectively improve maintenance efficiency and reduce costs.

[0003] In the actual production process, the selective laser melting forming of the reinforced corner box will inevitably produce defects such as holes and microcracks, resulting in poor stability of mechanical properties. In the actual use environment, the reinforced corner box is mainly subjected to bending stress. In order to ensure the safe and reliable installation and use of the additively manufactured reinforced corner box, the four-point bending simulation experiment is simulated under actual use conditions, which is not only of theoretical significance, but also of practical application significance. Therefore, designing a four-point bending test fixture for the mechanical property test of the reinforced corner box is very critical for fully verifying the reliability of the use of the additively manufactured reinforced corner box. Utility Model Content

[0004] In order to solve the above problems, the utility model proposes a four-point bending test fixture for strengthening the mechanical property test of the corner box.

[0005] A four-point bending test fixture for strengthening the mechanical properties of corner boxes, comprising:

[0006] A loading component, used for carrying out a loading test;

[0007] Simulated fuselage components are used to install reinforced corner boxes and simulate the actual structure of the fuselage;

[0008] The loading assembly includes an upper crossbeam, an upper connecting head matched with the upper crossbeam bolts, an upper pressure head matched with the upper crossbeam bolts, a lower crossbeam, a lower connecting head matched with the lower crossbeam bolts, and a left support and a right support matched with the lower crossbeam through bolts.

[0009] As a further improvement of the utility model, the simulated airframe assembly includes an airframe simulation structure matched with a reinforced corner box;

[0010] As a further improvement of the utility model, a plurality of groups of directional guide rails are arranged between the upper crossbeam and the lower crossbeam.

[0011] As a further improvement of the utility model, the upper pressure head can slide left and right on the upper cross beam to adjust the loading distance.

[0012] As a further improvement of the present invention, the left support and the right support can slide left and right on the lower cross beam to adjust the support distance.

[0013] The beneficial effects of the utility model are:

[0014] The utility model can conveniently simulate the actual loading conditions of the reinforced corner box, and perform a four-point bending loading test on the reinforced corner box, so as to comprehensively examine and verify the mechanical properties and reliability of the reinforced corner box; in addition, during the test operation, the support column is positioned and installed in the support hole of the support, and the operator can quickly and accurately install the test piece on the fixture, which has high work efficiency and ensures the accuracy and repeatability of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the assembly main structure of the utility model;

[0018] Figure 3 It is a side view structural schematic diagram of the utility model;

[0019] Figure 4 It is a schematic diagram of the structure of a typical simulated frame to be reinforced of the utility model;

[0020] Figure 5 It is a schematic diagram of the reinforced corner box structure of the utility model.

[0021] In the figure, 1. upper connecting head; 2. upper cross beam; 3. upper pressure head; 4. left support; 5. right support; 6. lower cross beam; 7. lower connecting head; 8. directional guide rail; 9. support column. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below.

[0023] like Figures 1 to 5 As shown, a four-point bending test fixture for strengthening the mechanical properties of corner boxes includes:

[0024] A loading component, used for carrying out a loading test;

[0025] Simulated fuselage assembly, used to install the reinforced corner box b, simulating the actual structure of the fuselage;

[0026] like Figure 1As shown, the loading assembly includes an upper crossbeam 2, an upper connecting head 1 bolted to the upper crossbeam 2, an upper pressure head 3 bolted to the upper crossbeam 2, a lower crossbeam 6, a lower connecting head 7 bolted to the lower crossbeam 6, a left support 4 and a right support 5 bolted to the lower crossbeam 6.

[0027] like Figure 2 As shown, the simulated airframe assembly of the utility model includes an airframe simulation structure a matched with a reinforced corner box b;

[0028] The simulated body assembly is slidably matched with the loading assembly through the support column 9.

[0029] The utility model can conveniently simulate the actual loading conditions of the reinforced corner box, and perform a four-point bending loading test on the reinforced corner box, so as to comprehensively examine and verify the mechanical properties and reliability of the reinforced corner box; in addition, during the test operation, the support column 9 is positioned and installed in the support hole of the support, and the operator can quickly and accurately install the test piece on the fixture, which has high work efficiency and ensures the accuracy and repeatability of the test results.

[0030] like Figure 1 As shown, several groups of directional guide rails 8 are arranged between the upper crossbeam 2 and the lower crossbeam 6 to avoid the offset of the upper and lower parts of the fixture during the test, resulting in unnecessary loss of manpower and material resources, reducing the test risk, and simulating the actual service loading conditions of the reinforced corner box through a four-point bending test fixture to comprehensively evaluate and verify the mechanical properties and reliability of the reinforced corner box.

[0031] The upper crossbeam 2 and the lower crossbeam 6 are designed with high rigidity, which meets the rigidity requirements while making the fixture as light as possible, thereby avoiding excessive deformation of the fixture during the test and making the operation more convenient.

[0032] like Figure 1 As shown, the upper pressure head 3 can slide left and right on the upper beam 2 to adjust the loading distance, and continuously adjust the span according to the loading requirements of the test piece.

[0033] like Figure 1 As shown, the left support 4 and the right support 5 can slide left and right on the lower cross beam 6 to adjust the support distance, and continuously adjust the span according to the support requirements of the test piece, so as to play a supporting and limiting role for the test piece.

[0034] Grease is applied to the inner sides of the left support 4 and the right support 5 to avoid excessive friction between the fixture and the test piece during the test process.

[0035] The surface of the support column 9 is coated with grease to ensure that there is no jamming between the test piece and the support column.

[0036] like Figure 1As shown, the upper connector 1 and the lower connector 7 are kept in the same vertical plane to ensure that the applied load is accurate and effective.

[0037] During the test:

[0038] 1. First, use the testing machine chuck to clamp the lower connector 7;

[0039] 2. Fix the lower cross beam 6 and the lower connecting head 7 by bolt connection;

[0040] 3. Then, use bolts to connect the left support 4 and the right support 5 and fix them on the lower crossbeam 6;

[0041] 4. Position and install the test piece composed of the simulated airframe structure and the reinforced corner box through the support column 9;

[0042] 5. The upper part of the fixture is clamped in the same installation order;

[0043] 6. Finally, install the four directional guide rails 8;

[0044] 7. The support hole of the left support 4 is elliptical, which does not limit the lateral freedom of the test piece, and the support column 9 can rotate freely along the axis in the support hole of the support.

[0045] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A four-point bending test fixture for strengthening the mechanical properties of corner boxes, characterized by: include: A loading component, used for carrying out a loading test; Simulated fuselage assembly for installing reinforced corner boxes (b) to simulate the actual structure of the fuselage; The loading assembly comprises an upper crossbeam (2), an upper connecting head (1) bolted to the upper crossbeam (2), an upper pressure head (3) bolted to the upper crossbeam (2), a lower crossbeam (6), a lower connecting head (7) bolted to the lower crossbeam (6), a left support (4) and a right support (5) bolted to the lower crossbeam (6); The simulated airframe assembly comprises an airframe simulation structure (a) matched with a reinforced corner box (b); The simulated body component is slidably matched with the loading component via a support column (9).

2. A four-point bending test fixture for strengthening the mechanical properties of corner boxes according to claim 1, characterized in that: A plurality of groups of directional guide rails (8) are arranged between the upper crossbeam (2) and the lower crossbeam (6).

3. A four-point bending test fixture for strengthening the mechanical properties of corner boxes according to claim 1, characterized in that: The upper crossbeam (2) and the lower crossbeam (6) are designed with high rigidity.

4. A four-point bending test fixture for strengthening the mechanical properties of corner boxes according to claim 1, characterized in that: The upper pressure head (3) can slide left and right on the upper crossbeam (2) to adjust the loading distance.

5. The four-point bending test fixture for strengthening the mechanical properties of corner boxes according to claim 1, characterized in that: The left support (4) and the right support (5) can slide left and right on the lower cross beam (6) to adjust the support distance.

6. A four-point bending test fixture for strengthening the mechanical properties of corner boxes according to claim 1, characterized in that: The inner sides of the left support (4) and the right support (5) are coated with lubricating grease.

7. A four-point bending test fixture for strengthening the mechanical properties of corner boxes according to claim 1, characterized in that: The surface of the support column (9) is coated with lubricating grease.

8. The four-point bending test fixture for strengthening the mechanical properties of corner boxes according to claim 1, characterized in that: The upper connecting head (1) and the lower connecting head (7) are maintained in the same vertical plane.

Images