Stationary fixture used for axial compression stability test of columnar bent plate

Abstract

The invention discloses a stationary fixture used for an axial compression stability test of a columnar bent plate. The stationary fixture comprises a down press plate, two L-shaped upright posts and multiple pairs of collets, wherein horizontal surfaces of the two L-shaped upright posts are respectively fixed on the down press plate and are located at the straight sides of two ends of a to-be-tested bent plate, and the multiple pairs of collets are fixed on the vertical surfaces in a segmental manner respectively along the straight sides of the two ends of the to-be-tested bent plate, so that the straight sides of the two end parts of the to-be-tested bent plate are clamped between the collets at two sides. The stationary fixture used for the axial compression stability test of the columnar bent plate, disclosed by the invention, has a simple structure and is suitable for testing bent plates with multiple curvatures as the clamping positions of the L-shaped upright posts and the collets are adjustable.

Description

technical field [0001] The invention relates to an auxiliary device for testing mechanical properties, in particular to a fixing fixture for the axial pressure stability test of a cylindrical curved plate. Background technique [0002] As a thin-walled structure with strong bending and torsion resistance, cylindrical curved plate is widely used in various industrial fields. The safety problems caused by this kind of structural instability have always been the subject of people's attention and research. In order to avoid the simulation of boundary conditions, cylinders can be used to study the buckling performance of cylindrical curved plates. Although this method does not need to consider the design of straight-edge fixtures, it is easy to cause waste of test materials, especially for expensive advanced materials; and When the curvature radius of the test piece is large, the testing machine may not have enough test space to complete the test. The simply supported boundary ...

AI Technical Summary

Problems solved by technology

Due to the springback phenomenon, the curvature radius of the cylindrical curved plate is difficult to control during forming, and there is a tolerance with the design size

Improper design will not only easily cause assembly problems between the specimen and the fixture, but also easily make the fixture not have enough adjustment margin to complete the neutral adjustment of the specimen

[0003] After searching the existing technology, it was found that the circularly reinforced cylindrical curved plate test published in the third issue of "Mechanics Progress" in 1976 recorded a fixture, which was mainly composed of Z-shaped casting blocks, V-shaped groove blocks and screws. Composition, but the V-shaped notch of this technology can not play a clamping role on the specimen, and whether the correct simply supported boundary condition can be realized remains to be considered; the internal pressure of a cylindrical curved plate published in the first issue of "Mechanics and Practice" in 1980 In the experiment, a fixture is recorded, which is mainly composed of a round cake chuck, a bearing support and an adjustable bearing support, but the round cake chuck of this technology cannot be adjusted according to the thickness of the test piece, and generally speaking The thickness of the board is not uniform so the applicability of this design is limited

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