Simulation and experimental study on machining of SiCp/Al composites
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摘要: 由于SiCp/Al颗粒增强复合材料具有高比模量、高比强度、耐磨性好、耐高温和导热导电性能良好等优异性能, 使其在工程应用中成为了传统金属的精良替代品。针对体积分数为45%的SiCp/Al颗粒增强复合材料进行切削研究, 建立切削仿真模型, 从应力场的分布情况、颗粒的断裂与破碎机理以及切屑表面的裂纹扩展等方面对切削机理进行仿真分析, 并通过铣削实验进行了验证。结果表明, 颗粒的断裂与破碎主要发生在剪切区和工件与切屑的分离面, 同时由于颗粒的存在会使切屑表面产生微裂纹, 微裂纹的扩展是影响切屑表面形态的重要因素。
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关键词:
- SiCp/Al复合材料 /
- 有限元仿真 /
- 应力分布 /
- 切屑形成机理
Abstract: The SiCp/Al metal matrix composites have excellent properties such as high specific modulus, high specific strength, good wear resistance, high temperature resistance, good thermal conductivity and electrical conductivity, which make it become excellent substitutes for traditional metals in engineering applications. In this paper, our research is about machining SiCp/Al metal matrix composites with 45% volume fraction and establishing machining simulation model with finite element analysis. The machining mechanism was analyzed from the von mises stress distribution, the fracture and crushing mechanism of the particle and crack propagation on chip surface, and verified by milling experiments. The results show that the fracture and crushing of particles mainly occur in the shear zone and the separation surface between the workpiece and the chips. At the same time, micro cracks will occur on the chip surface due to the presence of particles, the propagation of microcracks is an important factor affecting the surface morphology of metal machining chips. -
表 1 Al基体JC模型材料参数
A/MPa B/MPa n m C T0/(°K) Tmelt /(°K) 402 921 0.97 1.58 0.092 293.5 793.5 
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表 4 材料参数
参数 YG8刀具 Al基体 SiC 密度/(kg/m3) 14 600 2 810 3 130 弹性模量/MPa 640 000 71 700 420 000 泊松比 0.23 0.33 0.14 比热容/(J/kg·℃) 220 960 427 线膨胀系数/(10-6℃-1) 4.5 2.36 4.9 导热率/(W/m·℃) 75.4 173 81
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