关键词: 锐边弹丸撞击, 光滑粒子流体动力学法耦合有限元法, 翻转作用, 表面形貌, 数值模拟

Abstract:

The  smoothed particle hydrodynamics (SPH) method coupled FEM was applied to eliminate the limitations of finite element method (FEM) dealing with the chip separation and large deformation of the work piece. The SPH particles were used to model the work piece and the FEM was applied to discrete the angular particle, which  were coupled by using the contact algorithm. The influence of particle rotating effects on the crater depths and chips pile-up heights was studied under different simulation incidence conditions. The results showed that the particle would rotate forward when its rake angle bacame  large enough. The angular crater would be formed and chips would pile up at the edge of the crater without separating from the work piece. On the other hand, the particle would rotate backward when its rake angle was small. A shallow and smoothed crater would be formed and chips would separate from the work piece. The simulation model and results were validated by the existing theoretical and experimental data, which could provide an effective simulation research method to study angular particle erosion.

Key words: angular particle impact, smoothed particle hydrodynamics coupled finite element method, rotating effects, surface morphology, numerical simulation