Discrete Element Method (DEM) Simulation and Investigation of SiC on Pre-stressed Machining

doi:10.3724/SP.J.1077.2010.01286

Abstract

Abstract: The discrete element model (DEM) of SiC ceramic material for pre-stressed machining was established by using a cluster method. The processes of crack propagation on different pre-stressed machining conditions were investigated by means of DEM simulation and scratching test. Damages and cracks of surface/subsurface were also observed. Both DEM simulations and experimental results showed that, while the magnitude of pre-stress was controlled in a certain range, the number of radial cracks reduced as the increasing of pre-stress magnitude; and there was a trend that the radial cracks were replaced by the transverse cracks, so as to the SiC materials were removed in the form of smaller fragments. It could be seen that machining damage was decreased and surface quality was improved by applying the pre-stressed machining method, and it was further proved that discrete element method was feasible to simulate the machining process of brittle materials.

Key words: SiC, pre-stressed machining, crack, discrete element method, scratching test

CLC Number:

TQ174

JIANG Sheng-Qiang, TAN Yuan-Qiang, NIE Shi-Jun, PENG Rui-Tao, YANG Dong-Min, LI Guo-Yong. Discrete Element Method (DEM) Simulation and Investigation of SiC on Pre-stressed Machining[J]. Journal of Inorganic Materials, 2010, 25(12): 1286-1290.

References

[1] Huang H, Liu Y C. Experimental investigations of machining characteristics and removal mechanisms of advanced ceramics in high speed deep grinding. International Journal of Machine Tools & Manufacture, 2003, 43(8): 811-823.

[2] 徐文骥, 卢毅申, 金洙吉, 等. 离子体在陶瓷加工中的应用. 机械工程学报, 2002, 38(suppl): 73-75.

[3] 骆志高. 陶瓷材料电加工表面质量的研究. 机械工程学报, 2000, 36(11): 75-79.

[4] 闫胤洲, 季凌飞, 鲍勇, 等. 高硬脆陶瓷激光加工技术的研究及进展. 激光杂志, 2008, 29(6): 5-8.

[5] Bifano T G, Dow T A, Scattergood R O. Ductile-regime grinding: a new technology for machining brittle materials. Journal of Engineering for Industry, Transactions of the ASME, 1991, 113(2): 184-189.

[6] Huang H. Discrete Element Modeling of Tool-rock Interaction. Minnesota: University of Minnesota, 1999.

[7] Zhou Z H, Guo D T. Pre-stressed Machining: Combined Use of Heuristics and Optimization Methods. In Proceedings of IX the ICPR, Cincinnati, 1987, 1: 257-262.

[8] 叶邦彦, 彭锐涛, 唐新姿, 等. 预应力硬态切削的残余应力及表面形态. 华南理工大学学报: 自然科学版, 2008, 36(4): 6-10.

[9] Hzentz S, Donze F V, Daudeville L. Discrete element modeling of concrete submitted to dynamic loading at high strain rates. Computers and Structures, 2004, 82(29/30): 2509-2524.

[10] Tan Y Q, Yang D M, Sheng Y. Discrete element method (DEM) modeling of fracture and damage in the machining process of polycrystalline SiC. Journal of the European Ceramic Society, 2009, 29(6): 1029-1037.

[11] Tan Y Q, Yang D M, Sheng Y. Study of polycrystalline Al2O3 machining cracks using discrete element method. International Journal of Machine tool & Manufacture, 2008, 48(9): 975-982.

[12] 李德刚, 白清顺, 梁迎春, 等. 基于分子动力学的单晶硅纳米振动切削过程. 纳米技术与精密工程, 2007, 5(3): 205-210.

[13] 郭晓光, 郭东明, 康仁科. 单晶硅超精密磨削过程的分子动力学仿真. 机械工程学报, 2006, 42(6): 46-50.

[14] Cundall P A, Strack O D L. A discrete numerical model for granular assembles. Geotechnique, 1979, 299(1): 47-65.

[15] Potyondy D O, Cundall P A. A bonded-particle model for rock. International Journal of Rock Mechanics & Mining Science, 2004, 41(8): 1329-1364.

[16] Agarwal S, Rao P V. Experimental investigation of surface/subsurface damage formation and material removal mechanisms in SiC grinding. International Journal of Machine Tools & Manufacture, 2008, 48(6): 698-710.

[17] 龚江宏. 陶瓷材料断裂力学. 北京: 清华大学出版社, 2001.

[18] Kemeny J M. A model for non-linear rock deformation under compression due to sub-critical crack growth. International Journal of Rock Mechanics & Mining Science & Geomechanics Abstracts, 1991, 28(6): 459-467.

[19] Kemeny J M, Cook N G W. Micromechanics of Deformation in Rocks. Toughening mechanisms in quasi-brittle materials, Kluwer, Netherlands, 1991.