Zhang B, Yin J F. 2019. The 'skin effect' of subsurface damage distribution in materials subjected to high-speed machining. Int. J. Extrem. Manuf. 1, 012007.
Citation:
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Zhang B, Yin J F. 2019. The 'skin effect' of subsurface damage distribution in materials subjected to high-speed machining. Int. J. Extrem. Manuf. 1, 012007.
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The ‘skin effect’ of subsurface damage distribution in materials subjected to high-speed machining
More Information
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1 The Southern University of Science and Technology, Shenzhen, People’s Republic of China
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2 The University of Connecticut, Storrs, CT, United States of America
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3 Dalian University of Technology, Dalian, People’s Republic of China
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Abstract
The machining of difficult-to-machine materials, such as titanium alloys, hard and brittle materials and silicon carbide reinforced aluminum composite, has been suffering from the machining-induced damage (MID). Currently, various theories and techniques are available for machining of these materials but with their respective limitations. High-speed machining (HSM) is featured with high efficiency and high quality of a machined workpiece with no limitations to the workpiece materials. However, the fundamental mechanisms of HSM remain unknown, which obstructs its applications. This paper proposed the “skin effect” of MID in HSM. Based on the published work on MID, the paper identifies strain rate as the dominant factor for the “skin effect” although many other factors may also come to play. The paper elucidates that material deformation at high strain rates (> 103 s-1) leads to material embrittlement which in turn contributes to the “skin effect” of MID. The paper then discusses the “skin effect” in terms of dislocation kinetics and crack initiation and propagation. It provides guidance to predicting the material deformation and damage at a high strain-rate for applications ranging from the armor protection, quarrying, petroleum drilling, and high-speed machining of engineering materials.
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Keywords
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Author Introduction
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Professor Bi Zhang is currently a Chair Professor in the College of Engineering at the Southern University of Science and Technology in China. He received a B.S. degree from Jiangsu University in China, and M.S. and Ph.D. degrees from Tokyo Institute of Technology in Japan. Professor Zhang has been working on precision and ultra-precision machining in nearly four decades and has achieved notable academic attainments in machining of hard-to-machine materials. Starting from 1992, Professor Zhang was an Assistant Professor, Associate Professor and Professor to the University of Connecticut. He also served as the Director of the Management and Engineering for Manufacturing (MEM) Program during 2011-2013. He is a fellow of the International Academy for Production Engineering (CIRP), and a fellow of the American Society of Mechanical Engineers (ASME).
Mr. Jingfei Yin is currently a Ph.D. student at Dalian University of Technology in China. His research interest includes damage mechanisms in machining of hard and brittle materials, material responses to high-speed machining, and laser scattering detection of subsurface damage.
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