5 lines
254 B
C++
5 lines
254 B
C++
//- Increment of Green finite strain tensor
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DEpsilon = symm(gradDU) + 0.5*symm((gradDU & gradU.T()) + (gradU & gradDU.T()) + (gradDU & gradDU.T()));
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//- Increment of second Piola-Kirchhoff stress tensor
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DSigma = 2*mu*DEpsilon + lambda*(I*tr(DEpsilon));
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