Abstract—It is well known that a numerical simulation technique can be used to predict machining states such as cutting forces, stresses and temperature distribution. However, it is critical to simultaneously estimate the stress-strain relationship of the workpiece, and the friction characteristics between tool-chips during high-speed cutting processes. The objective of this study was to develop a new high-speed shear-slitting method that could at the same time neglect friction between tool-chip deformations. Through the proposed method, high-speed deformation characteristics of workpiece flow stress applicable for FEM simulation can be obtained. In this study, the Johnson-Cook (JC) constitutive equation flow stress model was considered as a function of strain, strain rate and temperature under a high strain rate during a shear-slitting process. As a result, we developed a high-speed shear-slitting method that can achieve high strain rates of up to 3.67x104 s-1. We then propose a method for deriving the JC constitutive equation from the shear-slitting experiment and two-dimensional simulation of shearing process.
Index Terms—Constitutive equation, flow stress, numerical simulation, shear-slitting.
The authors are with the Department of Mechanical System Engineering Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei-shi, Tokyo, Japan (e-mail: f4r1za55@gmail.com, sasahara@cc.tuat.ac.jp, beebeeshin@gmail.com, y.hiratsuka929@gmail.com, nakamur@cc.tuat.ac.jp).
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Cite: Norfariza Wahab, Hiroyuki Sasahara, Shinnosuke Baba, Yuta Hirastuka, and Takashi Nakamura, "Development of High-speed Shearing Method to Obtain Flow Stress under High Strain Rate," International Journal of Modeling and Optimization vol. 5, no. 2, pp. 140-144, 2015.
