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Journal Reference
The International Journal of Advanced Manufacturing Technology, pp 1-9, 2015.
Jiwoo Nam, Taesung Kim, Seong Wook Cho
School of Mechanical Engineering, Chung-Ang University, 221 Heukseok-dong, Dongjak-gu, Seoul, 156-756, Korea
Abstract
Numerical studies on the cutting process of brittle materials have not previously been conducted, due to the difficulties involved, which stem from the differences to their fracture mechanisms compared to those of ductile materials. The purpose of this study is to propose and implement a numerical cutting model that is able to represent the removal mechanism in brittle material. For this purpose, cutting behavior was simulated using the smooth particle hydrodynamics (SPH) method and the Johnson-Holmquist material model. The numerical cutting model of brittle materials proposed here was able to realize the propagation of cracks and the formation of discontinuous chips that are cutting characteristics in brittle materials. Location data was analyzed to judge the status of surface roughness after the numerical cutting process was analyzed. Numerical analysis was conducted to find optimal cutting conditions by investigating the surface roughnesses resulting from changes to various factors (cutting speed, cutting depth, rake angle). Finally, using the optimal cutting conditions found (high cutting speed, low cutting depth, and a rake angle close to 0°) was shown to contribute to improved surface roughness.
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