Role of Unloading in Machining of Brittle Materials

[+] Author and Article Information
A. Chandra, K. Wang, Y. Huang, G. Subhash, M. H. Miller, W. Qu

Department of Mechanical Engineering and Engineering Mechanics, Michigan Technological University, Houghton, MI 49931

J. Manuf. Sci. Eng 122(3), 452-462 (Sep 01, 1999) (11 pages) doi:10.1115/1.1285903 History: Received June 01, 1997; Revised September 01, 1999
Copyright © 2000 by ASME
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Schematic of indentation crack systems
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Schematic of experimental set-up for high strain rate indentation
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Comparisons of model predictions to experimental observations under fully unloaded configuration: (a) depths of normal damage zone, (b) surface traces of normal damage zone, and (c) size of lateral damage zone
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Comparison of model predictions to experimental observations (Fig. 6 in 35): (a) P=52N under loading, (b) P=90N peak load, (c) P=35N under unloading, (d) P=0 fully unloaded configuration, and (e) final normal damage contour
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Schematic of interactions of lateral and evolving normal damage zones upon reloading after unloading
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Effect of intermittent unloading from Pint on depth of penetration of normal damage upon subsequent loading to Pmax
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Variation of ΔP=Pshield−Pint with Pint
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Experimental set-up for single grit scratch tests
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Front view of scratch with modulation (maximum depth of cut=20 μm, cutting speed=8.6 cm/sec, modulation frequency 1 kHz, P-V modulation amplitude=20 μm; marker size 100 μm)
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Effect of modulation frequency on depth of median crack penetration
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The plastic deformation zone under indentation loading
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The spherical polar coordinate system for static model
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Coordinate system for the Cerruti field




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