球面冲击波作用下船体梁运动响应特性

Characteristics of dynamic response of ship-like beam subjected to spherical shock wave

将船舶结构简化为刚塑性等截面船体梁,以炸药在船体梁中部正下方爆炸工况为研究对象,提出了一种计算船体梁在近场爆炸冲击波作用下发生整体运动响应的理论方法。根据冲击强度的不同,将整体运动划分为刚体运动和塑性运动,分别建立了相应的运动理论模型,并进一步分析了两种运动形式的一般特性。结果表明:船体梁发生刚体运动时,结构的整体运动速度和位移随着时间的增加而非线性增大,但运动幅值较小;船体梁进入塑性运动后,其运动过程可看作是正向刚体上升过程中叠加了一个反向塑性变形过程,且梁中部以反向变形损伤为主。

To deal with the dynamic response of a warship subjected to underwater explosion,its hull was firstly simplified as a rigid,perfectly plastic uniform beam floating on water,and then a theoretical method was presented to describe how the beam reacted to the blast.According to different impact strength,the movement of beam can be divided into a rigid-body movement and plastic deformation,which were described respectively by different theory models to analyze the characters of these movements further.The results show that the velocity and displacement of the beam increase and increase nonlinearly when it acts as a rigid-body movement.For the duration of shockwave,the beam′s plastic deformation can be regarded as a course of downward rotation formed in the upward rigid-body movement,and the beam′s mid-span takes a downward bending damage finally.