Transactions of Materials and Heat Treatment

Title：Study on dynamic mechanical performance and fracture behaviors of high strength steel

Authors： HU Meng1 HAN Fei1 2 LI Qian1 WANG Ting1 LIN Shao-ting2 ZHOU Qing2

Unit： 1. College of Electromechanical Engineering North China University of Technology Beijing 100041 China 2. State Key Laboratory of Automotive Safety and Energy Tsinghua University Beijing 100084 China

KeyWords： high strength steel constitutive relation characterization fracture criteria

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2012,37(6):116-121

Abstract：

Quasi-static and dynamic tensile tests were conducted on a martensite high strength steel, and the stress-strain relationships in different strain rates were studied. The strain rate constant C was determined in the Johnson-Cook constitutive model, which considered the strain rate effect. The fracture strains obtained from different loading tests were compared. The results show that strain rate has little influence on the fracture, the fracture increases with the stress triaxiality increases. The parameters of the Johnson-Cook damage criteria were determined, which considered the stress triaxiality. The parameters of Johnson-Cook constitutive and damage criteria were applied to the simulation in ABAQUS. The simulation results agreed with the test data, which show that the constitutive and fracture model are correct.

Funds：

国家自然科学基金项目和上海宝钢集团公司联合资助项目（51074204）；北京市自然科学基金资助项目（3112010）；北京市中青年骨干人才培养计划（PHR20110851）；国家自然科学基金国际(地区)合作与交流项目（5111010501011）；北京市科技新星计划项目（2011003）；中国博士后基金项目（2011M500303）

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