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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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