冲击载荷作用下弹塑性圆板动力反直观行为的研究

The anomalous dynamic behaviors of struc-tures subjected to a short pulse load have attractedgreat interest.For the first ti me,Symonds andYu[1]found counter-intuitive response when theystudied dynamic behaviors of pin-ended beams un-der i mpact load.The counter-intuitive responsemeans that the permanent deflection of structure isin opposite direction to the load applied.A singledegree of freedom Shanley type model of beamisused to study the influence of thickness and damp-ing[2]to dynamic be…

The Research on Anomalous Response of Elasto-plastic Circular Plates due to Pulse Loading

Anomalous dynamic response means that final deflection of the structures may be in the direction opposite that of the load rather than in its direction.In this paper the anomalous behaviors of circular plates subjected to short transverse pulse load is studied.The plate is assumed fixed-pinned along the boundary.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 effects of internal forces and large plastic deformation after removal loading.Further plastic dissipation will be lead to anomalous dynamic response.This phenomena could be considered as the coupling of the geometry nonlinearity,material nonlinearity,elastic effects and the irrecoverable of the plastic deformation.