The great majority of results obtained by nanoindentation tests are performed by using Berkovich indenters. A Berkovich indenter has a three-sided pyramidal shape, with angles of 65.3° between the normal and the median of each face, and 76.9° between the normal and each corner line. For a perfectly sharp indenter, the projected contact area is A = 24.5h2, where h is the contact penetration depth. A Vickers four-sided pyramidal indenter has the same area function with respect to the depth penetration relation as a Berkovich indenter. Berkovich indenters are the most used in nanoindentation tests. Although real indenters are never perfectly sharp, three-sided pyramidal indenters such as Berkovich are normally less blunt than four-sided inden-ters like Vickers.
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