弹丸侵彻混凝土的SPH算法

SPH algorithm for projectile penetratin g into concrete

给出了弹丸侵彻混凝土的数值计算,其中弹体作为刚体处理并划分成Lagrangian标准有限元网格,而混凝土划分成光滑粒子并经历大应变、高应变率和高压作用。为了描述混凝土的非线性变形及断裂特性,在计算中引入了Holmquist Johnson Cook本构模型及损伤模型。计算结果与实验结果的对比表明,利用光滑粒子流体动力学方法对混凝土材料进行大应变、高应变率的变形计算是有效的,并可避免网格重分或网格消蚀。此外,将光滑粒子流体动力学方法和有限元方法结合可以保持计算过程中材料界面的清晰。

This paper presents computation of simulative projectile penetrating into concrete, where projectiles were treated by using standard Lagrangian finite elements and considered as rigid but concrete targets were divided into Smooth Particle Hydrodynamic(SPH) grids and subjected to large strains, high strain rates, and high pressures. To describe nonlinear deformation and fracture characteristics of concrete, Holmquist-Johnson-Cook constitutive relations and damage model were incorporated into computations. The comparison of the calculative results with experiments shows that the SPH algorithm for projectile penetrating into concrete subjected large strain is valid and that the mesh rezoning or mesh eroding become unnecessary for handling severely distorted zones by using this algorithm. It is obvious that projectile-concrete interface could be kept clearness by incorporation of the finite element method into SPH algorithm.