水下爆炸作用下结构弹塑性动响应数值计算方法  

Numerical Calculation Method of Elastoplastic Dynamic Response of Structures Subjected to Underwater Explosion

作　　者：戎宇飞 初东阳 周章涛[1,2,3] 刘国振 王海坤[1,2,3] RONG Yu-fei;CHU Dong-yang;ZHOU Zhang-tao;LIU Guo-zhen;WANG Hai-kun(China Ship Scientific Research Center,Wuxi Jiangsu 214082,China;Taihu Laboratory of Deepsea Technological Science,Wuxi Jiangsu 214082,China;National Key Laboratory of Ship Structural Safety,Wuxi Jiangsu 214082,China)

机构地区：[1]中国船舶科学研究中心,江苏无锡214082 [2]深海技术科学太湖实验室,江苏无锡214082 [3]船舶结构安全全国重点实验室,江苏无锡214082

出　　处：《火炸药学报》2024年第8期696-703,I0003,共9页Chinese Journal of Explosives & Propellants

摘　　要：针对水下爆炸强冲击载荷作用下结构塑性永久变形问题,建立流固耦合数值计算模型,采用二阶双重渐近法(DAA2)对流固耦合模型解耦,流体和结构数值模型利用分部法交错计算。流体部分对结构湿表面建立边界元模型,通过Newmark时间积分法求解二阶DAA方程;结构部分基于考虑弹塑性效应的任意参考构型理论建立了有限元运动方程,采用前增量位移时间积分法进行显式求解,避免流固耦合数据交互过程中的迭代修正以简化求解流程。对水下爆炸结构动响应问题进行数值模拟,并与理论及试验结果进行对比。结果表明,在水下爆炸产生的强冲击载荷作用下结构会发生永久塑性变形,本研究方法计算得到的位移、速度、应力等结构响应量与相关参考结果相吻合。表明发展的水下爆炸流固耦合求解方法可准确模拟强冲击载荷作用下的结构弹塑性动响应,拓展了DAA2方法的应用范围。Aiming at the problem of permanent plastic deformation of structures under strong shock load of underwater explosion,a fluid-solid coupling numerical calculation model was built.The second-order double asymptotic approximation method(DAA2)was used to decouple the fluid-solid coupling model.The fluid and structure numerical models were separated and calculated step by step.A boundary model for the wet surface of the structure was built for the fluid part,and the Newmark time integration method was used to solve the second-order DAA equation.The finite element motion equation of the structural part was built based on the arbitrary reference configuration theory considering the elastic-plastic effect,and the forward incremental displacement time integration method was used for explicit solution to avoid iterative correction during the fluid-solid coupling data interaction process,which simplified the solution process.The dynamic response of structures under water explosion was simulated,and compared with the theoretical and experimental results.The results show that the structures are in permanent plastic deformation under strong shock load by underwater explosion.The displacement,velocity and stress of the structures calculated by the current method are in good agreement with the reference results.It indicates that the developed fluid-solid coupling solution method for underwater explosion can accurately simulate the elastic-plastic dynamic response of structures under strong shock load,which improve the application scope of the DAA2 method.

关 键 词：爆炸力学 水下爆炸 二阶双重渐近法 弹塑性 动响应 DAA2 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术] O38[理学—流体力学]