【摘要】 借助于PAMSTAMP对管材液压胀形(THF)过程进行了数值模拟,预测了基于应力的成形极限图(FLSD)。发现并讨论了FLSD与传统成形极限图FLD之间存在的差别,分析了应变硬化指数n和壁厚t值对FLSD的影响。结果表明:随着n值的增加,成形极限值越来越高;当壁厚值较小时,成形极限值降低。更多还原

【Abstract】 With the aid of PAMSTAMP,FE software the process of tube hydroforming was numerically analyzed aiming at forecasting FLD(Forming Limit Diagram).It was found that the stress-based FLSD differs from the conventional strain-based FLD,and the reasons for the disagreement between them were discussed,the influence of strain hardening index and wall thickness on FLSD was also analyzed.The results are as follows: with the n-value increases,the forming limit curve becomes higher,and the forming limit curve decreases when the wall thickness is smaller.更多还原