Agilent Nano Indenter G200 User's Guide
For example, using a G200 system with an XP head and the following
parameters, a plot of total compliance vs (1/P) will be similar to that
shown in
Figure 7-5
on page 7-13:
•
Berkovich diamond on fused silica
•
20 independent indentations, each to a different peak force
•
Each symbol on the plot represents the results of one complete
indentation.
•
F
= 500 mN
max
•
F
= 68 mN
min
Additional considerations:
• High force results are the most valuable for determining frame
stiffness.
• Low force results are not valuable or even detrimental.
• Indents having a maximum displacement of less than 200 nm should
not be included in the calculation of frame stiffness.
2
2
1 v
–
1
1 v
–
i
---- -
=
------------------ -
+
------------------ -
E
E
E
r
i
1
1
-------- -
-------
------ -
=
+
K
2E
A
r
P
1
H
=
-- -
-------
=
A
A
H
1
1
----------- -
-------
------ -
=
+
K
2E
P
r
Theory 7
(16)
1
---- -
K
(17)
f
H
--- -
P
(18)
1
---- -
K
(19)
f
7-12