Proceedings of the Korean Society for Technology of Plasticity Conference (한국소성가공학회:학술대회논문집)
- 2003.05a
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- Pages.427-733
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- 2003
Prediction of Serrated Chip Formation due to Micro Shear Band in Metal
미소 전단 띠 형성에 의한 톱니형 칩 생성 예측
Abstract
Adiabatic shear bands have been observed in the serrated chip during high strain rate metal cutting process of medium carbon steel and titanium alloy. The recent microscopic observations have shown that dynamic recrystallization occurs in the narrow adiabatic shear bands. However the conventional flow stress models such as the Zerilli-Armstrong model and the Johnson-Cook model, in general, do not predict the occurrence of dynamic recrystallization (DRX) in the shear bands and the thermal softening effects accompanied by DRX. In the present study, a strain hardening and thermal softening model is proposed to predict the adiabatic shear localized chip formation. The finite element analysis (FEA) with this proposed flow stress model shows that the temperature of the shear band during cutting process rises above 0.5T
Keywords
- Metal cutting;
- Hardening and thermal softening;
- Size effect;
- Finite element analysis;
- Shear localized and serrated chip formation;
- Prediction of flow stress