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Nanoindentation<br />
Measuring Elastic Modulus<br />
Applied Load<br />
S = dP/dh<br />
• Elastic modulus, E, is calculated<br />
from the contact stiffness, S (the<br />
tangent to the unloading curve)<br />
• Contact area, A, is determined<br />
from the recovered displacement<br />
Depth<br />
1<br />
E<br />
r<br />
<br />
2<br />
2<br />
(1 ) (1 <br />
i<br />
)<br />
<br />
E E<br />
i<br />
<br />
E r<br />
<br />
2<br />
S<br />
A
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