基于损伤-相变本构模型的高强钢热成形数值模拟分析  

Numerical simulation of hot forming of high-strength steel based on damage-phase transformation constitutive model

作　　者：庄蔚敏[1] 解东旋[1] 余天明[1] 于皖东[2] 

机构地区：[1]吉林大学汽车仿真与控制国家重点实验室,长春130022 [2]中国第一汽车集团公司技术中心,长春130011

出　　处：《吉林大学学报（工学版）》2015年第4期1206-1212,共7页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51375201);吉林省自然科学基金项目(20130101048JC);国汽(北京)汽车轻量化技术研究院开发基金项目

摘　　要：针对目前商用有限元分析软件在模拟高强钢热成形过程中,只能模拟相变过程而无法模拟成形损伤过程这一问题,建立了高强钢热成形损伤-相变本构模型,通过编写该力学模型的用户自定义材料子程序,将其应用于LS-DYNA软件的高强钢热成形数值模拟中,在预测相变演化的同时实现成形损伤演化的预测。对帽形件进行了热成形虚拟试验,试验中马氏体体积分数的最大值出现在帽形件的法兰部位,其均值为98.5%,而成形损伤的最大值则集中在帽形件侧壁的中部,其值达到了0.7,该试验验证了本构模型的有效性,为高强钢热成形的实际生产提供了指导。In the simulation of hot forming of high-strength steel, the phase transformation process can be simulated using current commercial finite element analysis software; however, the forming damage process can not be simulated. To overcome such problem, a damage-phase transformation constitutive model for high-strength steel hot forming is established. By writing user defined material subroutine of this mechanical model, which is used in LS-DYNA software, the phase transformation process and forming damage process can be simultaneously predicted. Furthermore, hot forming virtual test of cap-shaped parts is conducted. Results show that the maximum value of the volume fraction of martensite appears in the flange portion of the cap-shaped parts, the average volume faction is 98.5% while the maximum forming damage concentrates in the middle o~ the side wall of the parts, and its value reaches 0.7. The effectiveness of constitutive model is verified in.this test, and this research may provide guidance for actual production of hot forming of high-strength steel.

关 键 词：固体力学 损伤-相变本构 高强钢 热成形 数值模拟 

分 类 号：TG142.1[一般工业技术—材料科学与工程]