基于FEM与SPH耦合算法的单颗磨粒切削玻璃的动态过程仿真

采用有限元法(FEM)与光滑质点流体动力学法（SPH）耦合算法,假设以圆锥作为磨粒的形状,以玻璃为工件材料，进行了单颗金刚石磨粒的三维磨削仿真。仿真结果表明：磨粒的挤压使工件材料向前方及两侧流动而产生隆起，且磨屑发生粉末化现象;沟槽的实际宽度远大于磨粒的切削宽度，断裂裂纹向沟槽两侧扩张，裂纹扩展一段后就停止不前而残留下来，成为残留裂纹。该方法可以较好地解决传统有限元法进行脆性材料磨削仿真时容易发生单元畸变的问题，验证了FEM与SPH耦合算法应用于脆性材料磨削仿真研究的可行性。

Dynamic Simulation of Single Grain Cutting of Glass by Coupling FEM and SPH

Three-dimensional cutting of glass with a cone-shaped grain was simulated by coupling FEM and SPH to resolve the mesh distortion problem caused by  using FEM only.The simulation results show that the workpiece material flows to side and front owing to the proceeding of single grain in the cutting direction,thereby leading to sideways flow and pulverization of cutting chips.It is also found that the width of actual groove left by the grain is greatly over the cutting width of the grain.The fracture cracks extend to the both sides of the groove and even enter into the workpiece surface to form residue cracks.The findings herein indicate the feasibility to simulate the cutting process for brittle materials by coupling FEM and SPH.