Agilent Technologies Nano Indenter G200 User Manual page 318

Agilent Nano Indenter G200 User's Guide
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:
Contact Depth is defined as:
Contact Area is defined as:
F
o
 
----- -
S = cos – K
s
h
o
h 0.75P
h = – ------------- -
c
S

2
 
S

-- - -----
A =
 
4 E
r
Theory 7
(27)
(28)
(29)
7-21