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TECHNICAL PAPERS

Indentation Analysis of Elastic-Plastic Homogeneous and Layered Media: Criteria for Determining the Real Material Hardness

[+] Author and Article Information
N. Ye, K. Komvopoulos

Department of Mechanical Engineering, University of California, Berkeley, CA 94720

J. Tribol 125(4), 685-691 (Sep 25, 2003) (7 pages) doi:10.1115/1.1572515 History: Received July 10, 2002; Revised December 30, 2002; Online September 25, 2003
Copyright © 2003 by ASME
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References

Figures

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Axisymmetric finite element mesh used in indentation simulations of elastic-plastic homogeneous and layered media. (The inset at the top of the figure shows the refinement of the mesh adjacent to the contact interface.)
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Comparison of finite element results (FEM) and analytical solution 12 for the normalized mean contact pressure versus normalized interference distance for homogeneous elastic half-space compressed by a rigid spherical indenter
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Normalized mean contact pressure versus representative strain for different material properties of elastic-plastic homogeneous media indented by a rigid sphere
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Plastic zone evolution in elastic-plastic homogeneous medium with E*Y=10 indented by a rigid sphere: (a) δ/R=0.072, (b) δ/R=0.1, (c) δ/R=0.2, and (d) δ/R=0.4
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Plastic zone evolution in elastic-plastic homogeneous medium with E*Y=100 indented by a rigid sphere: (a) δ/R=0.005, (b) δ/R=0.007, (c) δ/R=0.04, and (d) δ/R=0.059
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Comparison of finite element results (FEM) and experimental data obtained by Marsh 14 of normalized hardness versus effective elastic modulus-to-yield strength ratio
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Comparison of finite element data obtained from Fig. 3 and solution given by Eq. (10) for the normalized interference distance corresponding to the material hardness versus yield strength-to-effective elastic modulus ratio
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Indentation load versus interference distance for elastic-plastic layered medium with El/(1−νl2)/σY,l=10 indented by a rigid sphere
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(a) Equivalent hardness of elastic-plastic layered medium normalized by the substrate hardness and (b) calculated layer hardness and yield strength normalized by corresponding real material property values versus normalized interference distance
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Plastic zone evolution in elastic-plastic layered medium with El/(1−νl2)/σY,l=10 indented by a rigid sphere: (a) δ/R=0.072, (b) δ/R=0.1, (c) δ/R=0.2, (d) δ/R=0.243, (e) δ/R=0.3, and (f ) δ/R=0.4

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