Abstract
General equations are derived for evaluating the contributions of the non-penetration displacements to the apparent Young's modulus and hardness measured in an instrumented microindentation test. An idealized disk model is proposed to simulate the roles of porosity and sample displacements in determining Young's modulus and hardness from the indentation curve. The model is then applied to experimental data obtained from the indentation tests completed with separated and bonded yttria-stabilized zirconia (YSZ) thermal barrier coating layers. It is shown that in an instrumented microindentation test of a thin material plate, large scatter in the mechanical properties may originate from non-penetration displacements which usually increase with decreasing sample thickness. Predictions are also made for the apparent E-H values and show reasonable agreement with the measured data.
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