Diagnostics - Agilent Technologies Nano Indenter G200 User Manual

Diagnostics

Agilent Nano Indenter G200 User's Guide
A critical parameter in evaluating system performance is Stiffness
2
Squared Over Load, S /P. This parameter is proportional to the square
of modulus divided by hardness. It is a material property which is
independent of contact area and has units of stress; typically GPa is
used.
Square the elastic modulus from
then use H = P/A to yield
E
------- -
Thus:
For fused silica and Borofloat, the parameter S
between the values of 640 and 710 GPa for all displacements greater
than 200 nm. Graphs with acceptable data are shown as follows:
2
• S /P versus depth in
• Elastic modulus versus depth in
is between 70 and 75 GPa for all depths.
• Hardness versus depth in
between 9 and 10 GPa for all displacements greater than 200 nm.
Equation 6 on page 7-4 and set b to 1:
2

S
2

-- - ---- -
E =
r
4 A
2
2
 
S A
r
 
-- - ---- - -- - -- -
= =
4 A P 4
H
2
2
E
S
r

---- - ------- -
P H
2
/P should be constant
Figure 7-17 on page 7-25.
Figure 7-18
Figure 7-19 on page 7-26, where H is
Theory 7
(31)
2
S

---- -
P
(32)
(33)
on page 7-25, where E
7-24