摘要
为了预测ZK61M高强镁合金板热变形过程的韧性断裂行为,在一定条件下进行实验和数值模拟。基于获得的各试件断口处的应力状态参数和断裂应变数据,采用粒子群优化算法求解4种断裂模型中的待定系数。依据误差评估结果,确定改进的Wilkins模型精度最高。将改进的Wilkins模型引入有限元中,并与实验进行对比。结果表明,预测的拉伸件断裂位移和断裂载荷的平均误差均小于15%,预测的圆筒形件成形深度的平均误差为13.88%,建立的有限元模型可以较为准确地模拟实验过程并预测断裂位置。
To predict the ductile fracture behavior of a ZK61M high-strength magnesium alloy sheet during hot deformation,experiments and numerical simulations were performed under specific conditions.According to the stress state parameters and fracture strain data obtained for different specimens,the undetermined coefficients of four fracture models were solved using the particle swarm optimization algorithm.According to the error evaluation results,the modified Wilkins model was the most accurate.This model was introduced into a finite element,and the results were compared with experimental results.The results indicated that the mean relative errors of the fracture displacement and fracture load of the tensile parts were<15%,and the mean relative error of the forming depth of the cylindrical parts was 13.88%.The established finite element model can accurately simulate the experimental process and predict the fracture position.
作者
杨柳
段永川
官英平
Liu YANG;Yong-chuan DUAN;Ying-ping GUAN(Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of Education,Yanshan University,Qinhuangdao 066004,China;School of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,China)
基金
the financial supports from the National Natural Science Foundation of China(No.51705448)
the Natural Science Foundation of Hebei Province,China(No.E2021203163)。
关键词
ZK61M板
韧性断裂模型
参数优化
热变形
圆筒形件
ZK61M sheet
ductile fracture model
parameter optimization
hot deformation
cylindrical part
