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A Transparent Indenter Measurement Method for Mechanical Property Evaluation

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Abstract

An optical Transparent Indenter Measurement (TIM) method was developed for measurement of material surface mechanical properties. During the spherical indentation test, in-situ measurements of indentation-induced surface out-of-plane displacements were obtained using an integrated phase-shifting Twyman-Green interferometer. Based on elastic recovery theory and 2D finite element analyses, a procedure was developed to determine the material Young's modulus using the measured surface out-of-plane displacements. During the spherical indentation test, contact radii were also measured and used to estimate the material post-yielding true stress-strain curve using Tabor's empirical relation. An experimental TIM apparatus was assembled to test on two engineering alloys and the results showed good agreement with known material properties.

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Authors and Affiliations

  1. Mechanical and Aerospace Engineering Department, West Virginia University, Morgantown, WV, 26506, USA

    C. Feng (SEM member) & B. S. Kang

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  1. C. Feng
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  2. B. S. Kang
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Correspondence to B. S. Kang.

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Feng, C., Kang, B.S. A Transparent Indenter Measurement Method for Mechanical Property Evaluation. Exp Mech 46, 91–103 (2006). https://doi.org/10.1007/s11340-006-5862-5

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  • DOI: https://doi.org/10.1007/s11340-006-5862-5

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