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Analysis of contact explosion-induced crater of soil using multi-material ALE method

ZHANG Zhichao1,2,LIU Hanlong1,2,CHEN Yumin1,2,WANG Weiguo1,2(1.Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University, Nanjing 210098,China;2.Geotechnical Research Institute,Hohai University,Nanjing 210098,China)  
To study the contact explosion-induced crater of soil,the numerical technology was proposed in the frame of LS-DYNA based on multi-material arbitrary lagrangina-eulerian(ALE) method to simulate the blast-induced crater in geotechnical medium.The multi-material ALE method combines the advantages of both the Lagrangian method and the Eulerian method,which not only avoids the mesh distortion in the Lagrangian method,but also overcomes the complexity caused by the moving boundary problems not well-described in the Euler method.What is more,it allows a variety of physical materials in an element.With this method,the numerical simulation of the blast-induced crater of soil was implemented,and the formation of the crater could be observed in post processing by the flow of the material rather than the deformation or deletion of the elements etc.The numerical results are basically coincident with the data of CONWEP procedure,and the forming process and the ultimate form of the blast-induced crater agree well with objective law.All of these demonstrate that the multi-material ALE method is an effective way to simulate the blast-induced crater in geotechnical medium.
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