Rolling experiment method for materials

Abstract

The invention relates to a rolling experiment method for materials, relating to a research for carrying out deformation on the surfaces of the materials so as to improve the stress distribution on surface layers of the materials. The rolling experiment method is utilized for solving indirect problems of a plastic region by virtue of a finite element analysis method. Two rectangular samples are spliced together to form an integral sample and are tightly propped together by virtue of a sufficient force in an experiment process, the situation that a propping gap between the two samples is instantly opened or staggered is avoided by virtue of the force, the combined body of the two samples are subjected to rolling deformation so as to form an annular indentation, the propping force is releasedso as to separate the samples, and then an elastic plastic region can be observed from a primary propping surface.

Description

technical field [0001] The invention relates to a material rolling test method. This material rolling experiment method involves deformation treatment on the material surface to improve the stress distribution of the material surface. technical background [0002] The technology of deforming the surface of materials has been widely used, including shot peening, rolling and hammering, and has achieved good results in practice. [0003] The principle of several existing methods is to make the material surface undergo local plastic deformation sequentially, and finally make the material surface produce the expected precompression stress layer, thereby greatly improving the static strength and fatigue strength of the part. [0004] US3661655A introduces a method of immediately shot peening hardening at least one surface of the frozen spring after dynamic loading of the elastic element, so that residual compressive stress can be generated on the surface. [0005] With the devel...

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Problems solved by technology

[0010] The disadvantage is that the obtained strain data are surface data, and the change of the plastic zone occurs inside the material. The situation of the plastic zone can only be obtained indirectly through the method of finite element analysis. This method needs to set a series of boundary conditions. These boundaries The basis for setting the conditions is often insufficient, resulting in the plastic zone obtained by the final analysis not fully conforming to the real situation, which has limited guiding significance for actual scientific research and production

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