Improvement in depth-sensing indentation to calculate the universal hardness on the entire loading curve

Depth-sensing indentation modeling for determination of Elastic modulus of thin films

“…This is the manifestation of the deformation of the frame during the test. As a matter of fact, the intercept is found to be near 1 Â 10 À5 mm N À1 for 1/h c = 0 in accordance to previous results obtained by Chicot and Mercier (2007) in our laboratory on a standard fused silica specimen (Cf = 2.8 Â 10 À5 mm N À1 ) using the same equipment. Application of the model developed in relation (19) to the three TiCN films shows a very good fit to the experimental points with an excellent correlation coefficient R 2 very near 1 (Fig.…”

Size effects in nanoindentation of hard and soft surfaces

“…A wide debate is still open as to whether those size effects have to be fully attributed to the material behaviour at the nanoscale (intrinsic size effect, see for instance [19,20]), or they can be explained in terms of instrumental behaviour [14,[21][22][23]. There are at least two main reasons, which can lead to instrumental artefacts, related to the description of the indenter geometry and the evaluation of the quantities relevant to the tip penetration into the surface, respectively.…”

Multiscale and multicycle instrumented indentation to determine mechanical properties: Application to the BK7 crown borosilicate

“…To artificially increase the number of data, some authors 30 suggested the computation of a dynamic or continuous hardness over all the loading curve by computing the hardness from each point of the indentation data (h i , P i ) corresponding to the instantaneous penetration depth and load, respectively. This method which leads only to the calculation of the Martens hardness is interesting but usually overestimates the hardness number because of dwell-time (15 s) which is applied at the maximum load not considered into the computation.…”