摘要
确定压力随时间变化的关系曲线对于超塑成形工艺设计非常重要，本文在超塑成形压力计算时引入能量消耗控制策略，提出了一种压力－时间（Ｐ－Ｔ）曲线设计方法即恒能耗率法，实现了基于有限元数值模拟的超塑成形Ｐ－Ｔ曲线计算机辅助设计。文中对有关的压力控制算法及算式进行了较详细的介绍和推导，分别给出了半球壳自由胀形和圆筒形凹模约束成形过程的Ｐ－Ｔ曲线设计计算实例，并对计算结果进行了讨论。本文的研究拓宽了刚粘塑性有限元及数值模拟技术的应用范围。
It is important to determine the pressuretime relation for the design on superplastic forming process. The energy dissipation strategy is introduced to determine the forming pressure. This paper presents the constant energy dissipation rate method to design pressuretime curve for superplastic forming. Computer aided design of PT curve for superplastic forming is put into practice on the basis of numerical simulation by finite element method. The pressure control algorithm and the relative equations are introduced or induced in detail. The examples for the calculation of PT curve are given for two kinds of processes, which include free bulging of hemisphere and constrained bulging with cyclindric die, and the results are discussed. It is also an extension for the application of rigid viscoplastic finite element method and numerical simulation.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
1998年第2期132-137,共6页
Journal of Nanjing University of Aeronautics & Astronautics
基金
航空科学基金
关键词
超塑性成形
数值模拟
刚粘塑性
压力时间曲线
superplastic forming
numerical simulation
rigid viscoplastic finite element method
strain rate sensitivity index
optimum strain rate
