Agilent Technologies Nano Indenter G200 User Manual page 316

Agilent Nano Indenter G200 User's Guide
The reduced modulus of fused silica is known because the properties are
known:
For diamond, E = 1140 GPa and n = 0.07. For fused silica, E = 72 GPa
and n = 0.18, yielding:

1 0.18 –
E = -------------------------- -
r
The following parameters are needed for semi-static methods for
determination of indenter area function.
Contact Stiffness is defined as:
Contact Depth is defined as:
Contact Area is defined as:
Each indentation provides one ordered pair of (h
Figure 7-12 on page 7-20.
2 2
  
1 0.07 –
+ -------------------------- -
72 1140
dP
S = ------ -
dh
h
max
0.75P
max
h = h – ---------------------- -
c max
S

2
 
S

-- - -----
A =
 
4 E
r
Theory 7
= 69.87GPa
(23)
(24)
(25)
(26)
,A) as shown in
c
7-19