Method for establishing J-C constitutive model of metal material

Abstract

The invention relates to the field of laser shock peening and material constitutive, and particularly relates to a method for establishing a J-C constitutive model of a metal material. The method comprises the steps of obtaining the maximum residual stress of a laser shock peening area; carrying out a room-temperature static tensile experiment on the metal material to obtain an engineering stress-strain curve; converting the engineering stress-strain curve into a true stress-true strain curve; fitting the true stress-true strain curve to obtain parameters A, B and n in a strain hardening function; establishing a corresponding finite element model according to a laser shock peening experiment to obtain a strain rate function; estimating a strain rate coefficient C in the strain rate function, and inputting the C and the parameters A, B and n into finite element numerical simulation software to obtain simulated maximum residual stress; and judging that the error e meets an error threshold value to obtain a J-C constitutive model of the metal material. The method is not only suitable for establishing parameters of a single-variable constitutive model, but also suitable for establishing a multivariable constitutive model.

Description

technical field [0001] The invention relates to the fields of laser shock strengthening and material constitutive structure, in particular to a method for establishing a J-C constitutive model of metal materials. Background technique [0002] Laser shock processing (LSP) is a new technology that uses strong laser-induced shock waves to strengthen metals. It is an advanced surface strengthening technology that is widely used abroad and has broad prospects. It can greatly enhance the durability of metal materials. Compared with traditional surface strengthening techniques, laser shock treatment not only brings better surface strengthening effects, but also has the characteristics of non-contact strengthening, which can significantly reduce roughness changes caused by strong surface plastic deformation. Laser shock peening provides a wide range of options for surface strengthening process technology. With the rapid development of computer technology, finite element numerical s...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that some new materials cannot be simulated by laser shock strengthening finite element numerical simulation due to the lack of dynamic constitutive model, and proposes a method for establishing a J-C constitutive model of metal materials, which can be used for laser shock strengthening finite element of new materials. Guidance on how to improve the development of numerical simulation work

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