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 process.
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 size.
According to [10], 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) [13].
The
indentation on the primer was tear drop shaped and slightly swaged up on the narrow part of the
indentation.
