Mooney-Rivlin membrane with plain stress assumption.
The membrane has a uniform initial thickness h_0 and obeys a hyperelastic material law with strain energy by Mooney-Rivlin: \Psi = a_1 (I_1 - 3) + a_2 (I_2 - 3).
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dw_tl_membrane | (material_a1, material_a2, material_h0, virtual, state) |
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Notes
fun is either weak_function or eval_function according to evaluation mode.
Evaluate stress or tangent stiffness of the Mooney-Rivlin membrane.
[1] Baoguo Wu, Xingwen Du and Huifeng Tan: A three-dimensional FE nonlinear analysis of membranes, Computers & Structures 59 (1996), no. 4, 601–605.