Materials Selection for Energy-Efficient Systems
Materials Selection for Energy-Efficient Systems
Materials Selection for Energy-Efficient Systems
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Derive <strong>Materials</strong> Per<strong>for</strong>mance Indexes<br />
Nutshell story: We have to keep the fixed parameters. But we can ratio out<br />
the free variables (e.g. cross-sectional area). In the resulting equation, the<br />
materials properties are separated from the engineering terms.<br />
Example: A beam subject to a bending load…<br />
m AL mass of beam<br />
S CEI<br />
L 3 stiffness of beam; C = const., E = modulus<br />
I A2<br />
second moment of area (square beam)<br />
12<br />
Eliminate area A<br />
<br />
m 12SL3 <br />
<br />
C <br />
1 2<br />
L<br />
<br />
<strong>Materials</strong> selection<br />
<br />
<br />
<br />
<br />
E 1 2<br />
<br />
<br />
<br />
: Need to minimize<br />
<br />
E 1 2<br />
!
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