近地空中爆炸冲击波与柱形拱壳结构相互作用研究
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摘要
采用多物质欧拉与拉格朗日耦合算法,对近地空中爆炸冲击波与柱形拱壳结构的相互作用进行数值模拟。分别采用刚性体材料和考虑应变率的塑性材料来模拟拱壳结构,研究目标在爆炸作用下的运动、变形、损伤及破坏对爆炸荷载分布的影响。数值模拟分析结果表明,拉格朗日-欧拉耦合算法较好地模拟了爆炸冲击波在介质中的传播和作用在结构上的爆炸荷载效应。拱壳结构的正面反射系数在2～8之间,且刚性壁面的反射效果明显高于塑性材料的反射;拱顶处会产生"涡流"效应,导致局部区域压力下降;冲击波的绕射系数都小于1,它产生的是一个稀疏效应,材料对稀疏效应的影响不明显,有待进一步研究。
Using the multi-material Eulerian and Lagrangian coupling algorithm,a numerical simulation was constructed to simulate the interaction of blast wave with semicircular arched structure near the ground explosion.Using rigid bodies and plastic kinematic model with strain rate dependency and failure separately,the effects on the blast load distributions were investigated,which mainly consisted of structural displacement,deformation,damage and failure.The numerical analysis results show that the Lagrangian and Eulerian coupling algorithm provides a good simulation of the shock wave propagation in the media and explosion loading effects on the structure.The reflection coefficient in the front of the target is between two and eight,and the reflection effects using rigid bodies are obviously higher than that using plastic kinematic model.Eddy current effect is produced in the top of the target,which causes a pressure drop in local areas.The diffraction coefficient of shock wave is always less than one,which is similar to a sparse effect.The influence between materials and sparse effects is not obvious,and it is worthy of further study.
Using the multi-material Eulerian and Lagrangian coupling algorithm,a numerical simulation was constructed to simulate the interaction of blast wave with semicircular arched structure near the ground explosion.Using rigid bodies and plastic kinematic model with strain rate dependency and failure separately,the effects on the blast load distributions were investigated,which mainly consisted of structural displacement,deformation,damage and failure.The numerical analysis results show that the Lagrangian and Eulerian coupling algorithm provides a good simulation of the shock wave propagation in the media and explosion loading effects on the structure.The reflection coefficient in the front of the target is between two and eight,and the reflection effects using rigid bodies are obviously higher than that using plastic kinematic model.Eddy current effect is produced in the top of the target,which causes a pressure drop in local areas.The diffraction coefficient of shock wave is always less than one,which is similar to a sparse effect.The influence between materials and sparse effects is not obvious,and it is worthy of further study.
引文
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2]穆朝民,任辉启,李永池,等.爆炸冲击波作用于墙体及对墙体绕射的实验研究[J].实验力学,2008,23(2):169-174.
3]穆朝民,王光勇.爆炸冲击波绕过墙体的数值模拟研究[J].工程爆破,2008,14(2):16-19.
4]张雄,陆明万,王建军.任意拉格朗日-欧拉描述法研究进展[J].计算力学学报,1997,14(1):91-102.
5]张奇,张若京.ALE方法在爆炸数值模拟中的应用[J].力学季刊,2005,26(4):639-642.
6]李国豪.工程结构抗爆动力学[M].上海:上海科学技术出版社,1989.
7]张秀华,段忠东,张春巍.近地空中爆炸作用下钢框架结构冲击响应[J].地震工程与工程振动,2009,29(4):70-76.
8]白金泽.LS-DYNA3D理论基础与实例分析[M].北京:科学出版社,2005:102-103.
9]LS-DYNA Keyword user’s manual(970V)[M].Livermore Software Technology Corporation.Livermore,2003.
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