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<strong>The</strong>ory – <strong>The</strong> <strong>Lambda</strong> Concept and Material<br />
Selection<br />
• In general, a mechanical response function (e.g.,<br />
stiffness) can be approximated (or for simple<br />
shapes – exactly) by a coefficient times thickness<br />
to some power (C*t λ )<br />
• <strong>The</strong> magnitude of λ is a function of the<br />
architecture being studied and the specific<br />
response being solved for.<br />
• Generally speaking, the response to an increase in<br />
metal thickness is the most important criterion for<br />
weight savings via material substitution<br />
– A linear response favors steel<br />
– A non-linear response favors aluminum<br />
w w w . a u t o s t e e l . o r g
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