摘要
材料弹塑性本构模型是影响有限元模拟精度的最重要因素,混合硬化本构模型能较准确表现材料塑性变形过程真实硬化特征,而本构模型中材料特性相关参数是否准确直接影响到有限元模拟的精度。基于Hill48各向异性屈服准则,结合Voce各向同性硬化模型和Armstrong-Frederic非线性随动硬化模型,建立一个考虑材料各向异性和Bauschinger效应的混合硬化弹塑性本构模型。通过循环拉伸-压缩试验,获得DC54D+ZF镀锌板的循环变形应力-应变曲线,并利用通用全局优化算法,根据单向应力状态混合硬化本构方程,准确地确定了混合硬化模型中的材料特性参数。最后,使用ABAQUS有限元软件对板材循环拉伸-压缩问题和板材过拉深筋问题进行该本构模型的适用性分析,验证了所建立的各向异性混合硬化材料本构模型的可靠性和精确性。循环拉伸-压缩试验是直接准确地获得本构模型材料参数的有效方法。
The elastoplastic constitutive model of materials is the most important factor affecting the accuracy of finite element simulation.The mixed hardening constitutive model can accurately represent the real hardening characteristics of the plastic deformation process of materials,and the accuracy of the finite element simulation is directly affected by the accuracy of the material parameters of the mixed hardening constitutive model.Based on Hill48 anisotropy yield criterion,and combined with Voce isotropic hardening model and Armstrong-Frederic nonlinear kinematic hardening model,an elastoplastic constitutive model of mixed hardening considering material anisotropy and Bauschinger effect is established.The cyclic stress-strain curves of DC54 D+ZF galvanized sheet are obtained through cyclic tension-compression tests,and the material parameters of the mixed hardening model are accurately determined by the universal global optimization algorithm according to the constitutive equation of mixed hardening under unidirecextional stress state.The applicability of the constitutive model for the problems of cyclic tension-compression of sheet metal and sheet metal passing through drawbead is analyzed by using ABAQUS finite element software,which verifies the reliability and accuracy of the anisotropic mixed hardening constitutive model.Cyclic tension-compression test is an effective method to obtain the material parameters of the constitutive model directly and accurately.
作者
李群
金淼
邹宗园
郭佳
杨聪
LI Qun;JIN Miao;ZOU Zongyuan;GUO Jia;YANG Cong(Key Laboratory of Advanced Forging&Stamping Technology and Science(Yanshan University),Ministry of Education of China,Qinhuangdao 066004;Svolt Energy Technology Company Limited,Baoding 071000)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2020年第2期63-68,共6页
Journal of Mechanical Engineering
基金
国家自然科学基金资助项目(51475408,51575474).
