基于SPH算法的磨粒冲击工件表面过程的数值模拟

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (7) : 169-174.

论文

基于SPH算法的磨粒冲击工件表面过程的数值模拟

吕东喜1，黄燕华2，唐永健2，王洪祥1，张海军2

作者信息 +

Simulation Research on the Process of the Abrasive Impacting the Workpiece SurfaceBased on SPH Method

LV Dong-xi 1 HUANG Yan-hua 2 WANG Hong-xiang 1 TANG Yong-jian 2
ZHANG Hai-jun 2

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摘要

以Johnson-Holmquist ceramic脆性材料本构模型为基础，借助于光滑质点流体动力学方法，首次实现了对旋转超声加工中脆性材料内部裂纹形成及扩展过程的数值模拟。仿真结果表明，冲击裂纹的产生对于减小亚表层裂纹的扩展深度是有利的；冲击裂纹形成及扩展主要取决于磨粒冲击作用产生的拉应力的大小。通过对磨粒垂向切削力的研究发现：冲击裂纹及亚表层裂纹的产生有利于减小磨粒的垂向切削力；材料局部崩碎现象的出现是切削力在较大范围内波动的主要原因。通过与Conway的刻划实验结果进行对比发现，裂纹扩展方向的模拟值与实验值基本相符，验证了利用SPH方法对脆性材料切削加工过程中裂纹形成及扩展过程进行数值仿真的可行性。

Abstract

Taking the Johnson-Holmquist ceramic brittle material constitutive model as the foundation, the process of the crack formation and extension in the Rotary Ultrasonic Machining was firstly simulated by means of the Smoothed Particle Hydrodynamics method. The simulation results showed that the tensile stress generated by the abrasive impact was the main reason for crack formation. Also, the occurrence of the impact crack was advantageous in reducing the depth of subsurface cracks and improving the surface quality in fundamental. The generation of impact cracks and subsurface cracks benefited for the reduction of the cutting force. And the phenomenon of local micro-impact led to the main cutting force fluctuating in a wide range. The scratching experiments results conducted by Conway proved the feasibility of the SPH method in simulation of crack propagation.

导出引用

吕东喜;黄燕华;唐永健;王洪祥;张海军. 基于SPH算法的磨粒冲击工件表面过程的数值模拟[J]. 振动与冲击, 2013, 32(7): 169-174

LV Dong-xi HUANG Yan-hua WANG Hong-xiang TANG Yong-jian ZHANG Hai-jun . Simulation Research on the Process of the Abrasive Impacting the Workpiece SurfaceBased on SPH Method[J]. Journal of Vibration and Shock, 2013, 32(7): 169-174