摘要
运用刚粘塑性有限元法，对控制超塑性充模胀形过程的计算机仿真技术研究包括：本构关系确定，接触摩擦约束处理，载荷控制算法及其优化，数据采集实时处理，计算机自动控制系统研制。基于刚粘塑性有限元法的最大应变速率恒定法可将压力加载过程控制在最佳状态（优化的Ｐ－Ｔ曲线）；改善了钣料胀形轮廓的厚度分布状况。本文的研究解决了控制超塑性充模胀形过程中的主要问题：数据形成、采集、处理、传输、控制；对变化的压力加载曲线能实现计算机可视化实时控制；所预示的胀形件壁厚变薄趋势与实验结果吻合；缩短胀形时间；实现了一次胀形成功的目的。
Using rigid viscoplastic finite element method in this paper, computer visualization simulation for controlling superplastic bulging process about filling in a die is studied, including selecting the constitutive relation, treating contact and friction problems, calculation and optimum design for loading control, gathering data in time, and deve loping an automatic control system by computer. For the constant method of the maximum strain rate based on rigid viscoplastic finite element method, the loading process is controlled in a optimum state (optimized P T curve), and the thickness distribution of sheet metal superplastic bulging is improved. The major problems (the data about generating, gathering, treating, transferring, and controlling) for controlling superplastic bulging process about filling in a die are solved; the variable P T curve can visually be controlled by computer in time; the predicted thickness thinning distribution of the material formed by suerplastic bulging coincides with the experimental result of the material by using the method and equipment developed in the paper. The time for superplastic bulging is shortened, and the superplastic bulging of a sheet metal forms for succeeding at a time.
出处
《数据采集与处理》
EI
CSCD
1998年第4期358-361,共4页
Journal of Data Acquisition and Processing
基金
航空基金
关键词
有限元分析
超塑性成形
自动控制
计算机仿真
finite element analysis
superplastic forming
automatic control technique
computer simulation technique
