Analysis of Vickers indentation

Mechanical behavior of Ti cold spray coatings determined by a multi-scale indentation method

“…(4) and are referred to as "microhardness." Provided hardness is consistently reported in the same units and with the area calculated in the same manner, measurements made with Berkovich and Vickers indenters are found to have quite good agreement, largely due to the fact that both indenters are selfsimilar with a nearly identical relationship between projected area and indentation depth [5,34,35].…”

“…porosity) the difference was as large as 17%. Vickers hardness, VH, was calculated by dividing the applied force (in kg) by the indent surface area (in mm 2 ) [5] in the standard manner. However, for a comparison between the nanohardness, the Vickers hardness were converted to the units of GPa and a hardness, H micro , based on a projected contact area of the Vickers indenter [5,17,34,35]:…”

“…Other defects may have led to hardness loss for the bulk material such as porosity, or grain boundary sliding or microcracking. Some part of the hardness loss may also be related to the small differences between the Berkovich and Vickers indenters [5,35].…”

“…However, the technique has also been fraught with potential artifacts, many of which are related to a phenomenon known as the "indentation size effect" [2][3][4][5][6][7][8][9][10][11]. This typically refers to the simple observation that the hardness measured by an indentation test is often not constant, but instead changes with applied load.…”

On the analysis of the stress–strain behaviour of thin metal films on substrates using nanoindentation

“…Generally, finite element (FE) simulations have been shown to be a powerful tool for more sophisticated analyses and can be used to extract quantitative information on the stress-strain behaviour from nanoindentation data [7][8][9][10]. Also, FE methods combined with dimensional analysis have been used to extract mechanical properties of materials [11][12][13] and scaling relationships for indentation were determined [14].…”