Transactions of Materials and Heat Treatment

Title：A modified Johnson-Cook fracture criterion considering shear effect

Authors： Zhu Nan Zhao Zhen Zhuang Xincun

Unit： Shanghai Jiao Tong University

KeyWords： shear effect strain rate fracture criterion stress triaxiality

ClassificationCode：TG311

year,vol(issue):pagenumber：2015,40(8):127-131

Abstract：

A new fracture criterion considering shear effect was proposed based on Johnson-Cook fracture criterion. Experiments under different temperatures, strain rates and stress triaxiality were designed and carried out. Macro fractures under different conditions were analyzed. Results show that fracture strain at the fracture time decreases with the increase of temperature and strain rate. New fracture criterion was obtained and parameters were determined by FEM software. It was embedded in FEM software by ABAQUS subroutine. The cutting process of high speed bar was simulated numerically. FEM results show good consistency with experimental features and the new fracture criterion is validated by comparison of load-displacement curves obtained from FEM and experimental results.

Funds：

国家科技重大专项（2013ZX04002081）

诸楠（1990-），男，硕士研究生赵震（1972-），男，博士，教授，博士生导师

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