Clamping device for preventing compressive instability in sheet plane

Abstract

The invention relates to a clamping device for preventing the compressive instability in a sheet plane and belongs to the technical field of plate forming tests. According to the clamping device, a left lower comb die and a left upper comb die are vertically arranged opposite to each other; a right lower comb die and a right upper comb die are vertically arranged opposite to each other; the vertically arranged comb dies opposite to each other are respectively matched through a guide post and a comb tooth structure; the left lower comb die and the right lower comb die are arranged opposite to each other in the left and right direction; the left upper comb die and the right upper comb die are arranged opposite to each other in the left and right direction; the comb dies which are arranged opposite to each other in the left and right are respectively connected through a double end bolt in a sliding mode; working planes formed by the comb dies on the left and right sides are respectively opposite to each other; and a plate sample is positioned between the working planes of the comb dies which are arranged on the left and right sides relative to each other. The upper and lower dies can slide opposite to each other, and the dies on the left and right sides can move relative to each other, so that lateral stress is provided within the total sample range so as to avoid the compressive instability, and the free deformation in the sheet thickness direction is prevented from being influenced.

Description

technical field [0001] The invention relates to a clamping device for preventing in-plane compression instability of a thin plate, which belongs to the technical field of plate forming testing. Background technique [0002] Sheet metal forming is an important part in the field of material forming, and occupies a very important position in the national economy. The plate forming process is affected by many factors such as material properties, die shape, punching direction and speed, friction and lubrication conditions, and blank holder force. Mastering the properties of the slab, such as the tensile stress-strain curve, compressive stress-strain curve, and tension-compression stress-strain curve, has important guiding significance for the formulation of the slab forming process. [0003] For metal sheets with face-centered hexagonal and body-centered cubic structures, since the main plastic deformation mechanism is dislocation slip, and dislocation slip is not sensitive to t...

AI Technical Summary

Problems solved by technology

[0005] In order to carry out the unidirectional compression test or continuous tension-compression test in the plane of the thin plate, the present invention provides a clamping device to prevent the in-plane compression of the thin plate, and solve the problem that the clamping device in the prior art is difficult to realize the compression in the plane of the thin plate problem of instability

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