Agilent Technologies Nano Indenter G200 - Page 318

Theory 7
Agilent Nano Indenter G200 User’s Guide 7-21
Figure 7-14Additional example of data for determining indenter area
function
When determining area function dynamically the contact stiffness is
determined continuously during loading.
Contact Stiffness is defined as:
(27)
Contact Depth is defined as:
(28)
Contact Area is defined as:
(29)
S
F
o
h
o
------
cos K
s
–=
h
c
h
0.75P
S
--------------–=
A

4
---
S
E
r
-----


2
=