空洞敏感材料超塑性胀形过程的有限元模拟

基于刚粘塑性有限元技术采用最大应变速率恒定的压力控制策略和超塑性成形空洞损伤演变模型对空洞敏感材料的超塑性胀形过程进行了数值模拟。分别以半球壳和圆筒形零件为例 ,给出了优化后自由胀形和充模胀形的加压曲线 ,预测了成形零件的壁厚分布及空洞体积损伤情况。本文分析结果对指导超塑性胀形工艺设计具有实际意义。

Finite element simulation of superplastic bulging process of void-sensitive materials

Based on the rigid visco plastic FEM technique, this paper numerically simulate the superplastic bulging process of void sensitive materials using pressure controlling strategy of maintaining maximum effective strain rate constant and void damage evolution model of superplastic forming. By examples of free bulging of hemisphere and die bulging of cylinder parts, the optimum pressure cycles are calculated respectively, and the thickness distribution and void volume damage status are also demonstrated. The analysis results are helpful to the process planning in actual superplatic bulging processes.