Therefore, indentations were performed at different indenter
rates to probe, depending on the indentation frequency, the expected very different mechanical behavior of the sample.
tx]-is measured force in the material conditions of penetration of indenter
3 in tested material 4 on a deep [h.
In the contrast to the spherical indenters
, a sharp indenter
penetrates easily into the coating surface and cone cracking formation is suppressed by the radial cracks nucleation (Fig.
Rockwell hardness testing uses a diamond point indenter
, and is most commonly used for steel castings.
There have been many studies that deal with indentation tests using different indenter
geometries, such as a spherical indenter
(Brinell test), a conical indenter
(Cone hardness, HG, O'Neill (2)) and a diamond pyramid indenter
(Vickers test, or HV).
Brittle surface, affected by the indenter
, wear is calculated by the difference between the areas before and after effects of the indenter
, but because of the extra brittle fracture zones, calculation is more complex :
For Nanoindentation on rough surfaces, it is necessary to find and position the indenter
directly on a relatively smooth area.
In the beginning of the scratch, at low normal load, the indenter
tip was mostly sliding on the sample surface without causing significant coating damage.
used is a pyramid that leaves a mark on the deposited surface as shown in figure la, b.
Considering a different indenter
, Suwanprateeb investigated the time-dependence of Vickers microhardness of PMMA, high density polyethylene (HDPE) , and calcium carbonate-polyethylene composites .
In the test with maximum indentation force of 981 N and indenter
diameter of 10 mm, sub-surface lateral crack initiated and grew with cyclic ball indentations.
Contact pressures could be estimated by comparing the kinetic energy of the impacting indenter
(less the rebound energy) to the energy to produce the indentation volume.