Hyperelastic active fibres term. Effective stress S_{ij} = A f_{\rm max} \exp{\left\{-(\frac{\epsilon - \varepsilon_{\rm opt}}{s})^2\right\}} d_i d_j, where \epsilon = E_{ij} d_i d_j is the Green strain \ull{E} projected to the fibre direction \ul{d}.
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\int_{\Omega} S_{ij}(\ul{u}) \delta E_{ij}(\ul{u};\ul{v})
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dw_tl_fib_a | (material_1, material_2, material_3, material_4, material_5, virtual, state) |
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