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  1. Laarhoven

    Material stiffness matrix which is not symmetric

    Hello, I use MSC Marc with the subroutine hypela2. I use Total Lagrange where the material tangent stiffness C is dS/dE = C. (2nd Piola Kirchoff to Green Lagrange Strain). MSC Marc requires 36 components of the material tangent stiffness operator (assuming it is left and right symmetric). But my...

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