【作者】 高铁军； 陈宝鹏； 王忠金；

【Author】 Gao Tiejun~1,Chen Baopeng~1,Wang Zhongjin~2 (1.School of Aerospace Engineering,Shenyang Aerospace University,Shenyang 110136,China) (2.School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

【机构】 沈阳航空航天大学航空宇航工程学院； 哈尔滨工业大学材料科学与工程学院；

【摘要】 采用有限元方法分析了介质性能对黏性介质外压缩径成形的影响,得到了不同速率敏感指数下的黏性介质外压缩径过程中的筒坯失稳压力、失稳缩径量及起皱后褶皱形貌变化规律。研究结果表明:介质速率敏感性影响筒坯抗失稳起皱能力,选择具有较强速率敏感性的黏性介质可以延缓失稳、抑制褶皱长大,降低消除褶皱所需压力,有助于极限缩径量的提高。更多还原

【Abstract】 The influence of the medium performance on the viscous medium outer pressure necking forming is analyzed through finite element analysis method,and by this,the variation rules of buckling pressure,necking scope during buckling and appearance of wrinkles after wrinkling in the tube, under different rate-sensitive indexes in the process of viscous medium outer necking,are derived. The results demonstrate that,the rate-sensitivity of the medium can influence the capacity of resisting buckling and wrinkling of the tube,and therefore choosing viscous medium with high rate-sensitivity can delay buckling,restrain the growth of wrinkles,decrease the pressure required to eliminate wrinkles, and help to improve the necking limit.更多还原