覆土真空爆炸容器内部载荷及动态响应分析  

Analysis of internal load and dynamic response of vacuum explosion containment vessel with sand covered for explosive welding

作　　者：周德政 李晓杰[1,2] 王小红[1,2] 王宇新[1,2] 闫鸿浩[1,2] ZHOU Dezheng;LI Xiaojie;WANG Xiaohong;WANG Yuxin;YAN Honghao(School of Mechanics and Aerospace Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China;State Key Laboratory of Structural Analysis,Optimization and CAE Software for Industrial Equipment,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]大连理工大学力学与航空航天学院,辽宁大连116024 [2]大连理工大学工业装备结构分析优化与CAE软件全国重点实验室,辽宁大连116024

出　　处：《爆炸与冲击》2024年第10期111-122,共12页Explosion and Shock Waves

基　　金：国家自然科学基金(12072067,12172084)。

摘　　要：为了研制超大型真空爆炸焊接容器,探索覆土真空爆炸容器内的冲击载荷及结构动态响应,设计了一座可以满足实验需要的0.55 m^(3)小型真空爆炸容器,在其内部开展了一系列真空爆炸实验;应用AUTODYN有限元应用程序,对真空爆炸实验进行了数值模拟分析,深入探索了冲击波在容器内部的传播规律、冲击载荷分布状态、结构动态响应以及覆土厚度对平板结构消振作用的影响等问题。实验和数值模拟结果表明:爆炸容器内冲击载荷时程曲线的第2次脉冲峰值明显高于第1次脉冲峰值,且冲击波的叠加和反射总是发生在封盖内壁;随着容器内部真空度的不断下降,冲击载荷的峰值也被明显削弱;容器封盖的动态响应分为阶跃上升、脉冲随动、惯性滞后和静压稳定4个发展阶段;随着真空度的下降以及覆土厚度的增加,爆炸容器的动态响应逐渐被削弱。降低容器内部环境压力和增加覆土厚度均可削减爆炸容器的受迫振动,可为超大型真空爆炸容器的结构设计提供参考。Explosive welding production in a vacuum explosion containment vessel can not only restrict the shock wave and noise generated by explosive explosion in a certain space range,but also effectively improve the quality of explosive welding products.Meanwhile,it also alleviates the problems of unstable product quality and rainy season shutdown caused by the influence of weather and climate during explosive welding production,which is an invention that can promote the development of the explosive processing industry.In order to develop a super large vacuum explosion containment vessel for explosive welding,it is necessary to explore the internal blast load and dynamic response of vacuum explosion containment vessel with sand covered for explosive welding.In order to meet the requirements of the experiment,a 0.55 m^(3) small cylindrical vacuum explosion containment vessel with the cap covered by a certain thickness of sand was designed,and a series of vacuum explosion experiments were carried out in it.At the same time,using the AUTODYN finite element analysis program,the numerical simulation analysis of the corresponding experimental groups is carried out.The evolution of shock wave inside the container,the distribution of blast load,the dynamic response of the structure,and the mechanism of sand covering on the end of the container on the damping of the plate structure are explored in depth.By analyzing the results of experiment and numerical simulation,it is concluded that the peak value of the second impulse of the time-history curve of the blast load in the explosion containment vessel is obviously higher than that of the first impulse,and the superposition and reflection of the shock wave always occur in the inner wall of the cover.With the decrease of vacuum degree inside the container,the peak value of the blast load is weakened obviously.According to the time-history curves of blast load and dynamic strain calculated by the numerical simulation,the dynamic response of the container cover is divided into four d

关 键 词：真空爆炸容器 冲击载荷 动态应变 冲击波 真空度 覆土作用 

分 类 号：O382[理学—流体力学]