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45钢的J-C损伤失效参量研究
引用本文:陈刚,陈忠富,徐伟芳,陈勇梅,黄西成.45钢的J-C损伤失效参量研究[J].爆炸与冲击,2007,27(2):131-135.
作者姓名:陈刚  陈忠富  徐伟芳  陈勇梅  黄西成
作者单位:1.中国工程物理研究院结构力学研究所,四川 绵阳 621900
基金项目:国家自然科学基金项目(10232040)
摘    要:为了在结构碰撞效应的有限元分析中描述材料行为,通过开展45钢在不同应力状态和温度下的准静态材料力学性能实验及拉伸SHB实验,考察了应力状态三轴度、温度和应变率对材料失效应变的影响。由实验数据得到了Johnson-Cook失效模型参量,并通过出现失效的Taylor撞击实验和数值模拟进行了一定的验证,表明模型描述与实验结果的趋势一致。

关 键 词:固体力学    韧性失效    Johnson-Cook模型    Taylor撞击    应力三轴度
文章编号:1001-1455(2007)02-0131-05
修稿时间:12 7 2005 12:00AM

Investigation on the J-C ductile fracture parameters of 45 steel
CHEN Gang,CHEN Zhong-fu,XU Wei-fang,CHEN Yong-mei,HUANG Xi-cheng.Investigation on the J-C ductile fracture parameters of 45 steel[J].Explosion and Shock Waves,2007,27(2):131-135.
Authors:CHEN Gang  CHEN Zhong-fu  XU Wei-fang  CHEN Yong-mei  HUANG Xi-cheng
Institution:1.Institute of Structural Mechanics, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China
Abstract:In the FEM analysis of structure response under dynamic loading such as high velocity impact,the failure parameter is a important aspect of material behavior.With split Hopkinson tension bar tests and static material test at various stress states and temperatures,the effects of high strain rate,elevated temperature and stress triaxiality on the fracture behavior of 45 steel were studied.The Johnson-Cook damage fracture model parameters were exprimentally determined.The parameters were validated by comparison between the Taylor experiments and the simulations.The consistency between the experimental observation and numerical simulation indicates that the obtained parameters can describe the failure behavior of 45 steel under high speed deformation.
Keywords:solid mechanics  ductile fracture  Johnson-Cook model  Taylor impact  stress triaxiality
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