水下非接触爆炸加载下圆板塑性变形计算模型及影响因素研究  

Study on Calculation Model and Influencing Factors of Plastic Deformation of Circular Plate under Underwater Non-contact Explosion Loading

作　　者：徐维铮 黄宇 李彤 傅华[1] 王彦平[1] 郑贤旭[1] XU Weizheng;HUANG Yu;LI Tong;FU Hua;WANG Yanping;ZHENG Xianxu(Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621999,China)

机构地区：[1]中国工程物理研究院流体物理研究所,绵阳621999

出　　处：《中国造船》2024年第5期283-292,共10页Shipbuilding of China

基　　金：国家自然科学基金青年基金项目(12402444);装备预先研究领域基金项目(80928010101);中国工程物理研究院培育基金项目(PY20200003)。

摘　　要：基于能量法提出了一种在水下非接触爆炸中可考虑入射冲击波多次加载效应和材料应变率效应的圆板塑性变形的计算模型。将模型计算结果与文献中的试验及仿真数据进行对比分析,探讨入射冲击波多次加载效应、材料应变率效应对圆板塑性变形的影响。研究结果表明:(1)对于水下非接触爆炸加载,仅考虑入射冲击波初次加载作用会严重低估塑性变形值,其结果与试验及数值模拟数据的平均偏差高达-51.73%;考虑入射冲击波二次加载效应后平均偏差降低为-19.80%,二次加载效应在毁伤评估中不容忽视;(2)不能仅考虑入射冲击波能对结构的加载变形,在加载变形中气泡能的贡献不可忽略;(3)材料应变率效应对模型计算结果影响较大。不考虑材料应变率效应虽然可显著降低模型计算结果与文献中试验及仿真数据的偏差,但是这样做不符合材料对强冲击响应的特性,不建议在毁伤评估中使用。Based on the energy method,a calculation model of the final plastic deformation of a circular plate under underwater non-contact explosion loading is proposed,which can consider the effect of multiple loading of the incident shock wave and material strain rate.By comparing the calculation results of the model with the experimental and simulation data in the literature,the multiple loading effect of the incident shock wave and the material strain rate effect on the final plastic deformation of the circular plate is discussed.The results show that only considering the initial loading of the incident shock wave will seriously underestimate the final plastic deformation,and the average deviation from the experimental and numerical simulation data is as high as 51.73%;if considering the secondary loading effect of the incident shock wave,the average deviation can be reduced to 19.80%.Damage assessment cannot ignore the secondary loading effect of the incident shock wave,and the contribution of the bubble energy to the loading deformation can't be ignored.The material strain rate effect greatly influences the calculation results.Although the deviation between the model calculation results and the experimental and simulation data in the literature can be significantly reduced without considering the material strain rate effect,it does not conform to the response characteristics of materials under strong impact loading,so it is not recommended to be used in the damage evaluation.

关 键 词：水下非接触爆炸 冲击波 圆板 塑性变形 多次加载效应 应变率效应 

分 类 号：O382.1[理学—流体力学]