Numerical Simulation Of Projectile Penetrating Concrete Target Based On3D FE-SPH Adaptive Coupling Algorithm

The researches of projectile penetrating concrete have great significance toweapons development and engineering protection department. And study of thepenetration process and law of penetration has great implications to the weaponwarhead designs and the effect evaluation of damage. Previous researches onexperiment of concrete target have paid more attention to the projectile and target inthe final conditions. With the help of computer to solve continuum physics equationsof the penetration process, numerical simulation can not only reproduce the trajectorycurve of the projectile in the target, but also can get the time history of each physicalquantity, which is great help to make further study to the process of penetration.Penetration of concrete plate subjected to high velocity impact is often simulatedby finite element method (FEM), which has high computational efficiency. But highvelocity impact problems often involve severe deformation of materials, which maylead to extreme element distortions. Removing distortion elements through erosiontechnique from the model is most likely to cause total energy loss, and accuracy ofcalculation cannot be guaranteed at the same time. Smoothed particle hydrodynamics(SPH) method has an advantage in treating large deformations, and it can naturallysimulate damage and splash phenomenon of materials. But its relatively lowcomputational efficiency limits its application in three-dimensional (3D) modelingand analysis. Therefore, in order to take advantage of both FEM and SPH method, lotsof effort had been dedicated to the coupling of SPH and FEM in the past years.In this background, based on the experiment of projectile penetrating pain andreinforced concrete target, several numerical models are established by3D FE-SPHadaptive coupling algorithm, which is based on the works of Johnson and Xiao et al.At the beginning of this paper, recent developments of concrete penetration problemand the adaptive FE-SPH coupling method at home and abroad are briefly summarized.Then, the SPH algorithm and the FE-SPH algorithm of adaptive coupling areintroduced. After that, the FE-SPH adaptive coupling algorithm is used to studyseveral concrete penetration problems. In the study of the concrete penetrationproblem, the projectile normal penetrating into plain concrete target is firstlydiscussed, this study mainly focuses on penetration process, and the results ofsimulation are compared to the experimental results for further analysis purpose. Secondly, the phenomenon of ricochet of projectile penetrating into plain concrete issimulated, and the critical ricochet curve of different thickness target is acquired.Thirdly, the projectile penetrating into reinforced concrete is studied, and studiesmainly focuses on the influence of reinforcement ratio and impact position to thepenetration.The results of this paper have a certain guiding significance and engineeringapplication value to the protection design and structure of warhead.