【作者】 吴桂英； 杨桂通；

【Author】 WU Gui-ying,YANG Gui-tong,QIN Dong-qi (Department of Mechanics,Taiyuan University of Technology,Taiyuan 030024,China)

【机构】 太原理工大学工程力学系；

【摘要】 本文对弹塑性方板在横向脉冲载荷作用下动力响应的反直观行为进行了数值模拟及分析,文中给出了产生反直观行为的载荷范围和相关问题的探讨。通过较详细的分析发现,随着脉冲强度的增加,存在几个窄的载荷区域,板的响应是反直观的,即结构最终的变形与载荷作用方向相反。进一步考虑材料强化时分析表明,随着硬化模量增大,动力不稳定区域变窄,这一特殊的动力行为除与板内力间的相互耦合、反向塑性变形等因素有关外,材料的行为也存在很大的影响,这一现象是几何与材料两种非线性相互作用的结果。更多还原

【Abstract】 In this paper,anomalous response of elasto-plastic square plate subjected to short transverse pulse load is studied.The loading ranges have been found in which counter-intuitive behavior occurs,and related problems have been studied.It has been found by detailed numerical analyses that there exists anomalous response in some narrow loading ranges,so called slots.By further calculations it is shown that this special dynamic behavior is related to coupling affects of internal forces and large plastic deformation after removal loading.Further plastic dissipation will be lead to anomalous dynamic response.Those phenomena could be considered as the coupling of the geometry nonlinearity,material nonlinearity,elastic effects and the irrecoverable of the plastic deformation.更多还原