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TECHNICAL PAPERS

Finite Element Analysis of the Initial Yielding Behavior of a Hard Coating/Substrate System With Functionally Graded Interface Under Indentation and Friction

[+] Author and Article Information
L. S. Stephens, Yan Liu, E. I. Meletis

Mechanical Engineering Department, Louisiana State University, Baton Rouge, LA 70803

J. Tribol 122(2), 381-387 (Jul 14, 1999) (7 pages) doi:10.1115/1.555373 History: Received March 23, 1999; Revised July 14, 1999
Copyright © 2000 by ASME
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References

Figures

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Finite element model and coordinate system for indentation and friction of elastic cylindrical indenter on a hard coating/soft substrate system
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Comparison between analytical and finite element solutions for t/R=0 and (a) f=0 and (b) f=0.5
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Hardness and yield strength profiles for plasma nitrided Ti–6Al–4V alloy 16
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Distribution of equivalent stress at various depths in the substrate with low friction coefficient DLC coating (t/R=0.07,f=0.1)
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Profiles of calculated equivalent stress and graded and ungraded substrate yield strength (t/R=0,f=0)
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Location of initial yielding as a function of coating thickness (f=0.1)
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Critical applied contact stress as a function of coating thickness (f=0.1)
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Calculated effective stress in coating/substrate system with normalized graded and ungraded substrate yield strength superimposed (t/R=0.1,f=0.1)
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Distribution of equivalent stress at various depth in the substrate with larger friction coefficient (t/R=0.07,f=0.25)
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The effect of friction on the location of substrate initial yielding point
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The effect of coating/substrate elastic modulus ratio (Ec/Es) on the location of substrate initial yielding point (f=0.1 and t/R=0.01)
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Linear gradient in substrate elastic modulus (coating elastic modulus, Ec=433 GPa)
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Equivalent stress profile at centerline for graded elastic modulus versus ungraded elastic modulus (f=0.1,t/R=0.02)

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