船体梁在近距爆炸冲击波作用下动态响应的相似律研究  

Similarity law for dynamic response of hull girder subjected to underwater explosion in near field

作　　者：李海涛[1] 朱锡[1] 张振华[1] 

机构地区：[1]海军工程大学船舶与动力学院,武汉430033

出　　处：《振动与冲击》2010年第9期28-32,共5页Journal of Vibration and Shock

基　　金：国家"973"计划研究项目(51335020102)

摘　　要：以船体梁在爆炸冲击波作用下发生整体塑性运动响应的理论方法为基础,首先确定了影响梁整体结构最终塑性变形的相关物理量,利用定律对该问题进行相似性分析,给出相似参数和准确相似条件。研究了考虑结构应变率强化效应造成的相似畸变问题,分析了模型缩比尺度、模型应变率大小以及不同结构材料对相似误差的影响。研究发现:随着缩比尺度的减小,或结构应变率响应值的增大,预报误差将增大;所用结构材料的应变率敏感度越高,模型预报原型的误差越大。结论可用于指导船体梁在水下爆炸冲击波作用下动态响应的模型试验设计。On the basis of theoretical model of hull girder's plasticity deformation due to impact from blast,parameters that affect dynamic response of the girder were defined. principle was used to analyze the similarity law between model and prototype,and accurate similarity parameters and conditions were proposed.Inaccurate similarity problem caused by strain-rate effect was discussed,considering influences of model scale,strain-rate and materials on similarity.The results show that the smaller the scale or the larger the strain-rate,the larger the error of prediction.If a structural material is more sensitive to strain-rate effect,the error will be larger too.The conclusions obtained are useful to guide scaling experiments in which hull girder model subjected to shock wave is used to predict dynamic responses of a warship.

关 键 词：爆炸力学 水下近距爆炸 冲击波 动态响应 相似律 应变率强化 

分 类 号：U661.6[交通运输工程—船舶及航道工程]