基于CPFE-MK模型的TWIP钢板成形极限预测  

Prediction of forming limit of TWIP steel sheet based on CPFE-MK model

作　　者：蔡旺 钱凌云 孙朝阳[1,2] 张帅[1,2] 李明[1,2] 姚松林 CAI Wang;QIAN Ling-yun;SUN Chao-yang;ZHANG Shuai;LI Ming;YAO Song-lin(School of Mechanical and Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory of Lightweight Metal Forming,University of Science and Technology Beijing,Beijing 100083,China;National Key Laboratory of Shock Wave and Detonation Physics,Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]北京科技大学金属轻量化成形制造北京市重点实验室,北京100083 [3]中国工程物理研究院流体物理研究所,冲击波物理与爆轰物理重点实验室,四川绵阳621900

出　　处：《塑性工程学报》2021年第6期53-60,共8页Journal of Plasticity Engineering

基　　金：国家自然科学基金委员会-中国工程物理研究院联合基金资助项目(U1730121);国家自然科学基金国际交流计划(51911530209);国家自然科学基金资助项目(51805023);中央高校基础科研业务费资助项目(FRF-BD-19-003A,FRF-BD-18-003A,FRF-GF-19-003A);冲击环境材料技术重点实验室项目(6142902180201)。

摘　　要：建立了耦合晶体塑性和MK理论的TWIP钢板塑性变形过程的有限元模型,该模型采用不同厚度的特征单元描述MK理论的初始厚度不均度,在特征单元中引入耦合滑移和孪生的晶体塑性本构关系描述TWIP钢塑性变形的微观机制,实现了晶体塑性有限元与MK理论的结合,用于反映板料变形过程的不均匀变形程度和预测成形极限曲线。将模拟结果与实验获得的TWIP钢板的成形极限曲线进行对比,验证了模型的正确性。应用该模型分析了初始织构、初始厚度不均度和凹槽初始角度对TWIP钢板成形极限的影响。结果表明,铜型织构成形性能较好,成形极限应变随初始厚度不均度的增大和凹槽初始角度的减小而增大。A finite element model of the plastic deformation process of TWIP steel sheet coupled with crystal plasticity and MK theory was established.The representative volume elements(RVE)with different thicknesses were used to describe the initial thickness unevenness of MK theory in this model.Crystal plastic constitutive relations coupled with slip and twin were introduced into RVE to describe the microscopic mechanism of plastic deformation of TWIP steel,and the combination of crystal plasticity finite element(CPFE)and MK theory was realized,which was used to reflect the uneven deformation degree of sheet metal and predict the forming limit curve.The simulation results were compared with the experimental forming limit curves of TWIP steel sheet,and the correctness of the model was verified.The effects of initial texture,initial thickness unevenness and initial angle of groove on forming limit of TWIP steel sheet were analyzed using this model.The results show that the formability of the copper type texture is better and the forming limit strain increases with the increase of initial thickness unevenness and the decrease of initial angle of groove.

关 键 词：晶体塑性 MK理论 TWIP钢 成形极限 

分 类 号：TG306[金属学及工艺—金属压力加工]