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For User defined Anisotropic a 6-by-6 symmetric matrix is displayed. Due to the shell assumptions, you only need to enter values for D11, D12, D22, D14, D24, D55, D66, and D56.
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The Include geometric nonlinearity check box is displayed only if the model was created in a version prior to 4.3, and geometric nonlinearity was originally used for the selected domains. It is then selected and forces the Include geometric nonlinearity check box in the study step to be selected. If the check box is cleared, it is permanently removed and the study step assumes control over the selection of geometric nonlinearity.
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