基于双向拉伸试验的QP980汽车高强钢复杂变形行为分析  

Analysis of complex deformation behaviors of QP980 automotive high-strength steel based on biaxial tensile test

作　　者：李萧彤 苏洪英 梁笑 刘仁东 林利 徐鑫 LI Xiao-tong;SU Hong-ying;LIANG Xiao;LIU Ren-dong;LIN Li;XU Xin(Automobile and Home Appliance Steel Institute,Ansteel Group Iron and Steel Research Institute,Anshan 114000,China)

机构地区：[1]鞍钢集团钢铁研究院汽车与家电用钢研究中心,辽宁鞍山114000

出　　处：《塑性工程学报》2023年第5期180-185,共6页Journal of Plasticity Engineering

摘　　要：为了探索QP980先进汽车高强钢的复杂变形行为,采用Z100双向拉伸试验机进行了十字形拉伸试样设计,在标准试样的基础上进行了优化并通过仿真模拟对中心变形区域的受力情况进行了分析,验证了试样的有效性。研究了金属薄板双向拉伸试验的屈服轨迹的计算方法,对QP980先进汽车高强钢分别采用力值比、应变速率比和位移速率比3种控制方式进行双向拉伸试验,加载比例分别为4∶0、4∶1、4∶2、4∶3、4∶4、3∶4、2∶4、1∶4和0∶4,根据塑性功相等原则计算获得了不同加载路径下QP980高强钢的屈服轨迹,通过对比分析采用应变速率比控制和力值比控制的屈服轨迹一致性更好。To explore the complex deformation behaviors of QP980 advanced automotive high-strength steel,a cross-shaped tensile speci-men was designed by Z100 biaxial tensile testing machine.The specimens were optimized on the basis of the standard specimens,and the force in the central deformation region was analyzed by simulation to verify the validity of the specimens.The calculation method of yield trajectories in biaxial tensile test of metal sheet was studied.The biaxial tensile tests of QP980 advanced automobile high-strength steel were carried out by three control methods:force ratio,strain rate ratio and displacement rate ratio.The loading ratios were 4∶0,4∶1,4∶2,4∶3,4∶4,3∶4,2∶4,1∶4 and 0∶4,respectively.The yield trajectories of QP980 high-strength steel with different loading paths were calculated according to the principle of equal plastic work.Through comparative analysis,the consistency of yield trajectories under strain rate ratio control and force ratio control is better.

关 键 词：QP980 双向拉伸 十字形拉伸试样 复杂载荷 

分 类 号：TG142[一般工业技术—材料科学与工程]