Pure-shear loading device and method for tubular product

Abstract

The invention discloses a pure-shear loading device and method for a tubular product. A first core shaft penetrates into a first half pipe; a second core shaft penetrates into a second half pipe; thesize of the first core shaft is matched with the size of the first half pipe; the size of the second core shaft is matched with the size of the second half pipe; a first connection part of the first core shaft and a second connection part of the second core shaft are loaded; a first protruding part and a second protruding part are used for transmitting a force to a tubular product to be detected,so that a material, which is located on the same plane of a right plane or a left plane of the first half pipe and the left plane or the right plane of the second half pipe, on a whole pipe is at a pure-shear stress state. The pure-shear loading device disclosed by the invention is simple in structure; the first core shaft and the second core shaft, which have special designs, are used for inhibiting the rotation of the tubular product to be detected, which is difficult to control, in a shear deformation process; and the material, which is located on the same plane of the right plane or the left plane of the first half pipe and the left plane or the right plane of the second half pipe, on the whole pipe can be at the stable pure-shear stress state in a whole deformation process.

Description

technical field [0001] The invention relates to the technical field of pipe mechanical performance testing, in particular to a pipe pure shear loading device and method. Background technique [0002] Pipes are widely used in the production of the national economy, and the cross-sectional shapes are round, square and irregular. In addition to being directly used as load-bearing components, tubular parts after plastic processing are often used as structural parts. Typical forming methods include high-pressure forming of pipes and bending of pipes. Representative parts include automobile body chassis structures, various aircraft and Curved axis piping in automobiles, etc. [0003] In order to avoid failure phenomena such as wrinkling and cracking of pipes during plastic processing, it is necessary to understand the mechanical properties of the pipes used, use the results of computer numerical simulation to reasonably design and optimize the forming process parameters, and effe...

AI Technical Summary

Problems solved by technology

[0008] According to the mechanics of materials, if the pipe is divided into upper and lower parts by the section passing through the pipe axis, a pair of parallel forces with opposite directions are applied to the upper and lower parts, as shown in figure 1 As shown, at this time, the material passing through the section of the pipe axis on the whole pipe will produce a state of pure shear stress, but after plastic deformation occurs, the pipe will be twisted due to the action of the bending moment. The stress state is no longer pure shear loading, so the experimental data obtained by this experimental method has no practical significance

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