水下爆炸载荷作用下箱型梁冲击响应研究  

Study on Shock Response of Ship Hull Girder Subjected to Underwater Explosion

作　　者：沈晓乐[1] 王伟 SHEN Xiao-le;WANG Wei(Unit 91439 of PLA,Dalian116041,China;Unit 91251 of PLA,Shanghai 200940,China)

机构地区：[1]中国人民解放军91439部队,大连116041 [2]中国人民解放军91251部队,上海200940

出　　处：《爆破》2023年第3期225-228,242,共5页Blasting

摘　　要：水下爆炸冲击载荷通常包括冲击波载荷和气泡脉动载荷,冲击波和气泡载荷联合作用的结构整体损伤问题一直是舰船设计领域研究的热点。通常认为冲击波载荷对结构影响以局部损伤为主,而气泡脉动载荷对结构影响以整体损伤为主。水下爆炸载荷实际毁伤舰船的过程往往是两种载荷共同作用的结果,很难量化两种毁伤元素对舰船的毁伤贡献。为了研究两种载荷对舰船的毁伤效应,采用变截面箱型梁模拟水面舰船结构,对其在水下爆炸冲击载荷作用下的响应过程进行试验研究。实验工况设计既考虑了距离对冲击波作用影响,也考虑了最大化气泡能作用的条件。结果表明受近场爆炸载荷作用,近水面箱型梁结构形成塑性铰,导致爆炸载荷传递到梁结构的能量主要转化为塑性铰的变形能。结构的动态应变响应从箱型梁中部到端部逐渐减小,且残余塑性变形主要发生在结构中部附近,箱型梁上表面采用的具有连续性大开口模式导致甲板边板及上部塑性变形较船体底部大。本文研究成果可对开展舰船设计提供一定的借鉴意义。The shock load of underwater explosion usually includes shock wave load and bubble pulsation load.The structural damage caused by shock wave and bubble load is always a hot topic in ship design.It is generally believed that the impact of shock wave load on the structure is mainly local damage,while the impact of bubble pulsation load on the structure is mainly global damage.The actual damage process of underwater explosion load is often the result of the joint action of the two kinds of loads.However,it is difficult to quantify the contribution of the two kinds of elements to ship damage.In order to study the damage effects of two kinds of loads on ships,a variable section box girder was used to simulate the surface ship structure,and its response process under the impact of underwater explosion was experimentally studied.Both the influence of distance on shock wave and the conditions for utilizing bubble energy were considered in the design of the experiment.The results show that plastic hinge was formed in the box beam structure near water surface under the action of near-field explosion load,and the energy transferred by explosion load to the beam structure was mainly converted into the deformation energy of the plastic hinge.In addition,the dynamic strain response of the structure gradually decreased from the middle to the end of the box beam,and the residual plastic deformation mainly occurred near the middle of the structure.The continuous large opening mode on the upper surface of the box beam resulted in larger plastic deformation of the deck side plate and the upper part than that at the bottom of the hull.

关 键 词：水下爆炸 应变响应 箱型梁 

分 类 号：O382[理学—流体力学]