Martin T, Espanol P, Rubio MA, Zuniga I
Departamento de Fisica Fundamental, Universidad Nacional de Educacion a Distancia, C/Senda del Rey s/n, E-28040 Madrid, Spain.
Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics. 2000 Jun;61(6 Pt A):6120-31. doi: 10.1103/physreve.61.6120.
Dynamic fracture of brittle materials is studied by means of a molecular dynamics simulation of a two-dimensional (2D) lattice of point particles. By a particular discretization of the continuum equations of elasticity, we derive the Born model in such a way that the model parameters are related to the material properties. Numerical simulations are performed, which show a branching instability, under Mode I loading, occurring at a critical crack tip speed. The analysis of the dynamical stress tensor field near the tip shows a qualitative similarity to Yoffe's stress field.
通过对二维点粒子晶格进行分子动力学模拟，研究脆性材料的动态断裂。通过对弹性连续介质方程进行特定离散化，我们推导出了玻恩模型，使得模型参数与材料特性相关。进行了数值模拟，结果表明在I型加载下，临界裂纹尖端速度处会出现分支不稳定性。对尖端附近动态应力张量场的分析表明，其与约菲应力场在定性上具有相似性。
