Theory 7
Agilent Nano Indenter G200 User’s Guide
7-12
(16)
(17)
(18)
(19)
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
•
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
max
= 500 mN
•
F
min
= 68 mN
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.
1
E
r
-----
1
v
2
–
E
-------------------
1
v
i
2
–
E
i
-------------------
+
=
1
K
-------
2
E
r
---------
1
A
-------
1
K
f
-----
+
=
H
P
A
---
=
1
A
-------
H
P
----
=
1
K
-------
H
2
E
r
------------
1
P
-------
1
K
f
-----
+
=