Transactions of Materials and Heat Treatment

Title：Development of piecewise linear hardening plane strain UMAT and its application for high strength steel

Authors： Li Rongqi Gong Zhihui

Unit： Hunan University

KeyWords： high strength steel stamping piecewise linear hardening constitutive model UMAT

ClassificationCode：O344；TG302

year,vol(issue):pagenumber：2019,44(6):145-149

Abstract：

A elastic-plastic constitutive model of high strength steel was developed based on the piecewise linear hardening hypothesis and J2 flow rule, and the stress was updated by the implicit backward Euler radial return algorithm. Then, the Jacobian matrix of material plane strain was derived, and the corresponding user material subroutine UMAT_PL suitable for the piecewise linear hardening high-strength steel plane strain in the stamping forming was complied. Furthermore, the stamping forming of high-strength steel trough part was analyzed by the isotropic hardening constitutive model of ABAQUS, the user material subroutine UMAT_L of the linear hardening model fitted by the least square method and the user material subroutine UMAT_PL of piecewise linear hardening plane strain. The result shows that the stress calculated by the piecewise linear hardening UMAT-PL is consistent with the stress calculated by the isotropic hardening constitutive model built-in ABAQUS, and the piecewise linear hardening model can predict stress distribution more accurately compared with the linear hardening model.

Funds：

国家自然科学基金资助项目（51475155）

李荣启（1972-），男，博士，讲师 E-mail：287293916@qq.com 通讯作者：龚志辉（1974-），男，博士，副教授 E-mail：gzhaa@163.com

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