Fractured Scratches - Agilent Technologies Nano Indenter G200 User Manual

Fractured Scratches

Agilent Nano Indenter G200 User's Guide
With A , the contact area is:
s
A
s
These parameters can be measured immediately after the scratch is
made by performing a cross profile measurement.
Under severe abrasion conditions (usually generated by geometries of
indenters like cube corner or conical indenter with a small included
angle), fracture processes can occur. Particles are chipped out of the
surface and/or cracks appear in and/or outside the scratch groove. This
behavior creates irregularities in scratch penetration, tangential force
curves, and residual scratch morphology, such as shown in
Figure E-8Example of fracture scratch mechanism

2
a h –
a
bf
= --------------------- - + -------------------------- -


cos
2 3 sin
Scratch Testing E

h
b
(48)
Figure E-8.
E-12