where the subscripts h003 and h005 represent the indentation
depths of 30 [[micro]m and 50 [[micro]m, respectively.
Figure 3 shows the residual indentation
depth profile for the nanoindentations of nylon fibers.
Pile-up or sink-in effects must be considered for better accuracy as the indenter contact area depends on the type of the material's response to the indentation
The sample was displaced up and down towards the indenter for reproducing the indentation
As for the three indentation
levels, schematically shown in Fig.
The Viekers microhardness tests are use because the indentation
requires minimal specimen preparation and can be performed several times on a single specimen.
Even though many different types of indentation
instruments exist, discomfort and pain thresholds of mechanical forces have been studied extensively with the use of the pressure algometer [26-27].
Figure 2a/b shows the Vickers Hardness HV (calculated from the indentation
hardness HIT) and the indentation
modulus EIT of two coatings--a hard anodised coating (480 HV) of 11 [micro]m thickness (shown in red) and a soft anodised coating of 14 [micro]m thickness (shown in blue).
As seen in the SEM in Figure 1(a), the grain size of TM is generally larger than the indentation
According to , ranges of hardness testing are defined: macro scale--test force diapazon 2 N--30 kN, micro scale--test force less than 2 N, indentation
depth more than 0.
The approach and retraction force curves are processed in real time to give a map of the structural-mechanical properties of the surface: (1) height of the relief, (2) adhesion force, (3) depth of indentation
of probe indentation
into the material, and (4) stiffness of the material (elastic modulus E calculated in terms of the Derjaguin-Muller-Toporov (DMT) model) .
on the primer was tear drop shaped and slightly swaged up on the narrow part of the indentation