DP780高强钢板动态变形力学行为研究  

Research on the dynamic deformation behavior of the DP780 advanced high strength steel

作　　者：田成达[1] 李大永[1] 彭颖红[1] 汪晨[2] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]宝山钢铁股份有限公司,上海200122

出　　处：《塑性工程学报》2008年第6期102-106,共5页Journal of Plasticity Engineering

基　　金：国家973前期研究项目(2006CB708611);上海市科教兴市项目;上海市优秀学科带头人计划(07XD14016);教育部新世纪优秀人才计划(NCET-07-0545)

摘　　要：通过准静态拉伸实验和0.1m/s,2m/s,10m/s和15m/s等4种拉伸速度下的动态冲击拉伸实验,对DP780高强钢板的动态变形行为进行了研究,得到了不同应变率下的应力-应变曲线,基于Johnson-Cook模型建立了可描述DP780高强钢变形应变率相关性的应力-应变关系模型。为更好地预测材料动态冲击条件下的应变率以及应力的变化,提出了一个基于宏观变量速度v的本构关系方程,数值拟合结果与实验结果十分吻合。The dynamic deformation behavior of the DP780 was studied by the quasistatie tensile experiment and the dynamic tensile experiment under the speed of the 0. 1m/s, 2m/s, 10m/s and 15m/s. The strain-stress curves were obtained under the different strain rates and the mechanical behavior of DP780 constitutive equation was established based on the Johnson-Cook model. A new constitutive equation based on the variable-tensile speed v was developed to better forecast the strain rate and stress under the dynamic impact condition. The result turns out： the new constitutive is accordance with the experimental data.

关 键 词：DP780 冲击拉伸 应变率 J-C本构 

分 类 号：TG142.12[一般工业技术—材料科学与工程]