超薄板胀形破裂极限预测理论研究

Theory research on rupture limit prediction for thin plate

由于生产中的破裂极限问题对于超薄板胀形特别突出,本文通过公式推导并结合有限元模拟技术,基于Swift分散性失稳和Hill集中性失稳两种理论模型,将最小厚度值计算结果与有限元模拟实验得到的材料破裂时的最小厚度值进行对比,分析计算结果表明:Hill失稳理论能较为准确地预测超薄不锈钢材料在胀形过程中的破裂趋势,该结论可用于预测超薄不锈钢发生胀形时的极限。

In production, the rupture limit problem for thin plate bulging is particularly prominent. Formula and the finite element simulation technology were used to compare the minimum thickness calculated value with the simulated experimental results based on Swift diffuse instability theory and Hill concentrated instability theory. The analysis and calculated results show that Hill model can predict bulging cracking tendency of thin stainless steel material, which is the right model for predicting the bulging limit for thin stainless steel material.