Advances in Sciences and Technology (Jul 2022)
Effect of Surface Tilt on Nanoindentation Measurement on Copper and Glass
Abstract
Results of an investigation of the effect of surface tilt in range of 0-6 deg on nanoindentation measurements under Berkovich indenter at different loads made on copper and glass surfaces are presented and discussed. It was found that: (1) measured hardness increases for tilt angle >3 degand this increase is about 12% at 6 degfor both samples at all applied loads, (2) the overestimation in hardness is due to the increase of projected contact area A with the tilt angle, but the theoretical contact area A described by the traditional analytical area function leads to lower change in the hardness than the experimental one up to about 5% may be attributed to the horizontal deflection of the stem holding the indenter, and (3) indentation modulus E is more sensitive to the tilt for glass than copper and the sensitivity in the values of E at a given tilt angle increases with decreasing indention load.
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