45钢的J-C损伤失效参量研究  

Investigation on the J-C ductile fracture parameters of 45 steel

作　　者：陈刚[1] 陈忠富[1] 徐伟芳[1] 陈勇梅[1] 黄西成[1] 

机构地区：[1]中国工程物理研究院结构力学研究所,四川绵阳621900

出　　处：《爆炸与冲击》2007年第2期131-135,共5页Explosion and Shock Waves

基　　金：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。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.

关 键 词：固体力学 韧性失效 Johnson-Cook模型 Taylor撞击 应力三轴度 

分 类 号：O346.5[理学—固体力学]