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group_materi_membrane index switch

If switch is set to -yes the zz stress becomes zero in 2D and the yy and zz stress become zero in 1D (in combination with axi-symmetry in 1D, only the yy stress becomes zero since zz is the axi-symmetric direction). If group_materi_membrane is not used the plane strain conditions are used. Always the z-thickness is 1. in 3D, and the y, and z-thickness are 1. in 2D; see however also volume_factor.

The group_materi_membrane option cannot be used in combination with group_materi_elasti_compressibility, group_materi_hyperelasticity and group_materi_viscosity.

The index specifies the element_group, see element_group.



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1998-11-16