An adjustable compression buckling test fixture for thin plate structures

Abstract

The invention discloses an adjustable thin-plate structure compression buckling test fixture. The invention can carry out compression buckling tests under various environments for various thin-plate test pieces of different thicknesses. The clamping of the workpiece, and the surface-to-surface contact between the wedge block and the thin plate test piece is tightened to ensure that the thin plate test piece is evenly stressed. Due to the special shape of the wedge block, it can play a good locking effect during the test loading process. , it is not suitable for slippage and unloading force. A pair of guide column structures are distributed on both sides of the upper and lower chucks for positioning and guidance. One linear bearing is equivalent to a rotating pair that limits the four degrees of freedom in space. Two linear bearings are used together. That is, the five degrees of freedom of the structural space position are restricted. The invention is convenient and quick, has wide applicability, has good positioning and guiding functions, can improve test efficiency and reduce test errors.

Description

technical field [0001] The invention relates to a clamp for compression buckling test of a thin plate structure test piece, belonging to the technical field of macroscopic mechanical performance testing. [0002] technical background [0003] Thin plate structures are widely used in engineering fields such as aerospace, vehicle engineering, civil engineering, shipbuilding and chemical engineering. In practical engineering applications, due to the special external dimensions of the thin-plate structure, the most common failure form under the action of external load is buckling instability, and the buckling failure of the thin-plate structure is sudden, and the loss caused by the failure is often greater than the strength failure. Big. The buckling failure of thin-plate structures has always been a hot issue in the field of structural research. Improving the buckling failure resistance of thin-plate structures, reducing structural weight, and improving structural design have i...

AI Technical Summary

Problems solved by technology

[0006] First, before the test, it is necessary to manually adjust the testing machine and the upper and lower fixtures, and the operator needs to visually adjust the position of the fixtures to make the upper and lower fixtures parallel to the center. This method has a large error in parallel alignment, and the position of the fixtures directly affects the results and accuracy of the test. , and even change the nature of the test, especially for thin-walled specimens;

[0007] Second, when clamping the test piece, the method of screwing is usually used, and several screws are used for tightening and tightening. This method requires both the correct sequence and method of screwing the screws and the appropriate screwing force, so as to ensure as much as possible The force on the clamping part is uniform and not deflected. In short, this method of tightening the specimen will lead to uneven force on the specimen, eccentricity and bending of the specimen as a whole, which will cause the specimen to collapse early during the test, and eventually lead to the test with large error;

[0008] Third, under the support of this kind of fixture, problems such as sliding and unloading may occur during the test loading process, which will affect the smooth progress of the test

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