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The Finite Element Method for the Analysis of Non-Linear and ...

The Finite Element Method for the Analysis of Non-Linear and ...

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Example<br />

Consider <strong>the</strong> four node element shown below. Examine <strong>the</strong> effect <strong>of</strong> using two<br />

different stress measures <strong>and</strong> <strong>the</strong> same constitutive matrix on <strong>the</strong> Cauchy stresses.<br />

2<br />

1<br />

3 4<br />

A. TL <strong>for</strong>mulation Using <strong>the</strong> PK2 stress measure <strong>and</strong> <strong>the</strong> Green-Lagrange strain<br />

tensor we have:<br />

t<br />

0S ij = t t<br />

0C ijrs 0 ɛ rs (1)<br />

Institute <strong>of</strong> Structural Engineering <strong>Method</strong> <strong>of</strong> <strong>Finite</strong> <strong>Element</strong>s II 11

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