| 材料应变率对圆柱壳轴向冲击屈曲的影响 |
| |
| 引用本文： | 刘理,刘土光,李天匀.材料应变率对圆柱壳轴向冲击屈曲的影响[J].振动与冲击,2000,19(3):60-62,51. |
| |
| 作者姓名： | 刘理 刘土光 李天匀 |
| |
| 作者单位： | 华中理工大学船舶与海洋工程系,武汉,430074 |
| |
| 基金项目： | 国家自然科学基金资助项目! ( 1 9772 0 1 2 ) |
| |
| 摘 要： | 研究了轴向冲击载荷作用下材料应变率对圆柱壳弹塑性冲击屈曲的影响，采用Ｋａｒｍａｎ－Ｄｏｎｎｅｌｌ运动方程，本构关系采用增量理论，联立Ｃｏｗｐｅｒ－Ｓｙｍｏｎｄｓ关系，求得相应的动屈服应力，借助增量数值计算方法注解运动方程，计算表明：材料的应变率敏感性显著地提高了结构的抗冲击屈曲能力；基于Ｂ－Ｒ准则的屈曲判断方法和采用Ｓｏｕｔｈｗｅｌｌ方法可以获得一致的临界屈曲载荷。
|
| 关 键 词： | 圆柱壳 轴向冲击 动力屈曲 材料应变率 |
THE EFFECTS OF STRAIN-RATE-SENSITIVITY ON DYNAMIC BUCKLING OF CYLINDRICAL SHELLS UNDER AXIAL IMPACT |
| |
| Liu Li,Liu Tuguang,Li Tianyun.THE EFFECTS OF STRAIN-RATE-SENSITIVITY ON DYNAMIC BUCKLING OF CYLINDRICAL SHELLS UNDER AXIAL IMPACT[J].Journal of Vibration and Shock,2000,19(3):60-62,51. |
| |
| Authors: | Liu Li Liu Tuguang Li Tianyun |
| |
| Affiliation: | Department of Naval Architecture and Ocean Engineering.HUST.Wuhan 430074 |
| |
| Abstract: | The effects of strain-rate-sensitivity on dynamic buckling of cylindrical shells under time-dependent axial impulsive loads are discussed.The time-dependent displacements of cylindrical shell are assumed to be governed by nonlinear equation of motion based on the Karman-Donnell kinetic relations.The increment theory is adopted to form the constitutive relation of material and the dynamic yield stress is calculated from Copwer-Symonds relation.The increment numerical method is used to solve the kinetic equations.The results exhibit that the critical buckling loads are improved greatly while considering the material strain rate sensitivity,and dynamic buckling loads are estimated based upon the notion of a Southwell plot conforming to the corresponding data of the B-R criterion |
| |
| Keywords: | cylindrical shell axial impact dynamic buckling strain rate sensitivity |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
