法兰连接爆炸冲击动力响应分析数值模拟  

Numerical simulation for dynamic responses of flange connection structures under blast impact loads

作　　者：陈锐林[1] 董琪 CHEN Ruilin;DONG Qi(School of Civil Engineering and Mechanics,Xiangtan University,Xiangtan 411100,China)

机构地区：[1]湘潭大学土木工程与力学学院,湖南湘潭411100

出　　处：《振动与冲击》2018年第17期56-62,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金重点项目(51434002);国家自然科学基金项目(10972191);湖南省自然科学基金项目(07JJ6004);湖南省优秀博士论文奖励专项资金(YB2011B031)

摘　　要：运用LS-DYNA非线性有限元软件,建立了法兰连接结构的三维有限元模型,使用罚函数法实现了法兰盘-螺栓连接-法兰垫的非线性耦合作用,利用温度荷载法实现了螺栓连接结构的预紧力加载,采用ALE多物质流-固耦合算法研究了法兰连接结构在爆炸冲击荷载作用下的动力响应特性,分别研究了法兰连接在爆炸冲击荷载作用下冲击波入射角、螺栓连接预紧力、法兰垫厚度对其结构的影响,并考虑了垫片为金属材料(合金钢)以及非金属材料(橡胶)时的情况。结果表明,法兰盘为法兰连接的主要耗能构件。合金钢法兰垫片受冲击波入射角的影响较小,而螺栓连接则主要受冲击波入射角的影响。法兰盘在高压压缩波的作用下会产生相对于螺栓连接的不均匀压缩变形。厚垫片并非比薄垫片好,适当减小法兰垫片厚度,可以提高法兰结构的抗冲击能力。Using the nonlinear finite element software LS-DYNA,a flange connection structure’s 3D finite element model was built.The nonlinear coupling among a flange disk,a bolt connection and a flange gasket was realized using the penalty function method.The pre-tightening force loading of bolt connection was realized using the temperature load method.The ALE multi-matter fluid-solid interaction algorithm was adopted to study the dynamic response characteristics of a flange structure under blast impact loads.The effects of shock wave’s incident angle,bolt connection’s pre-tightening force and flange gasket’s thickness on a flange connection structure’s dynamic features were studied considering flange gasket being alloy steel and rubber under the action of blast impact loads.The results showed that flange disk is the main energy-dissipation component;bolt connection is mainly affected by incident angle of shock wave;effects of shock wave’s incident angle on an alloy steel flange gasket are smaller;under the action of high pressure compression wave,the flange disk produces non-uniform compression deformations relative to bolt connection;a thicker flange gasket is not always better than a thinner one be,reducing properly flange gasket’s thickness can improve the anti-impact capacity of flange connection structures.

关 键 词：法兰连接 爆炸冲击 数值模拟 动力响应特性 

分 类 号：O383.3[理学—流体力学]