摘要
传统机械压机的滑块移动模式相对固定,准静态问题的冲压仿真通常忽略应变率的影响。而伺服压机的滑块行程灵活,冲压速度可调,因此,精确的伺服冲压仿真需要含应变率的材料本构模型。为解决通过拉伸试验只能获得有限数量应变率下的应力-应变曲线的问题,以DDQ钢的试验数据拟合为例,分析评价了幂律模型、线性幂律模型、Johnson-Cook模型和Cowper-Symonds模型等应变率敏感模型。对分段应变范围和分组应变率进行曲线拟合,构建了各模型中参数的识别方法,并讨论了各模型在有限元软件中的适用性。研究结果可以帮助用户选择合适的本构模型进行伺服冲压仿真。
The slide movement pattern of traditional mechanical presses is relatively fixed,and quasi-static stamping simulations usually ignore the effect of strain rate.In contrast,servo presses feature a flexible slide stroke and adjustable stamping speed;thus,a material constitutive model that includes the strain rate effect is necessary to achieve accurate servo stamping simulations.To address the limitation of obtaining the stressstrain curves at only a finite number of strain rates through tensile tests,this paper analyzed and evaluated the strain rate-sensitive models,including the power law model,linear power law model,Johnson-Cook model and Cowper-Symonds model,using DDQ steel test data for model fitting as an example.Curve fitting is performed for segmented strain range and grouped strain rates,the parameter identification methods in each model are constructed and the applicability of each model in finite element software is discussed.The results provide guidance for selecting an appropriate constitutive model for servo stamping simulations.
作者
戴大力
赵坤民
DAI Dali;ZHAO Kunmin(Hozon New Energy Automobile Co.,Ltd.,Jiaxing 314500,Zhejiang,China;Dalian University of Technology,Dalian 116024,Liaoning,China)
出处
《汽车工程学报》
2025年第2期235-244,共10页
Chinese Journal of Automotive Engineering
基金
国家自然科学基金项目(51775160)。
关键词
应变率相关
本构模型
伺服冲压
板材金属成形
strain rate dependent
constitutive model
servo press stamping
sheet metal forming
作者简介
戴大力(1969-),男,河北丰润人,硕士,高级工程师,主要研究方向为新能源汽车整车开发。E-mail:daidali@hozonauto.com;通信作者:赵坤民(1971-),男,辽宁大连人,博士,教授级高级工程师,主要研究方向为车身设计与先进制造。E-mail:zhaokunmin@hozonauto.com。
