• May 15, 2019 News!Vol.7, No.5- Vol.8, No.4 has been indexed by EI (Inspec).   [Click]
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  • Sep 30, 2019 News!Vol 9, No 6 has been published with online version. 12 original aritcles from 6 countries are published in this issue.    [Click]
General Information
    • ISSN: 2010-3697  (Online)
    • Abbreviated Title: Int. J. Model. Optim.
    • Frequency: Bimonthly
    • DOI: 10.7763/IJMO
    • Editor-in-Chief: Prof. Adrian Olaru
    • Executive Editor: Ms.Yoyo Y. Zhou
    • Abstracting/ Indexing: ProQuest, Crossref, Electronic Journals Library, Google Scholar, EI (INSPEC, IET), EBSCO, etc.
    • E-mail ijmo@iacsitp.com
Editor-in-chief
Prof. Adrian Olaru
University Politehnica of Bucharest, Romania
I'm happy to take on the position of editor in chief of IJMO. It's a journal that shows promise of becoming a recognized journal in the area of modelling and optimization. I'll work together with the editors to help it progress.
IJMO 2015 Vol.5(2): 140-144 ISSN: 2010-3697
DOI: 10.7763/IJMO.2015.V5.450

Development of High-speed Shearing Method to Obtain Flow Stress under High Strain Rate

Norfariza Wahab, Hiroyuki Sasahara, Shinnosuke Baba, Yuta Hirastuka, and Takashi Nakamura
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.

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