“…There exists a variety of models for slender structures, going much beyond the traditional models for the stretching of bars and the bending of beams. The applicability of classical models being limited to materials having linear, homogeneous and isotropic elastic properties, a number of extensions have been considered to account for different elastic behaviors such as hyperelastic materials (Cimetière et al, 1988) or more specifically nematic elastomers (Agostiniani et al, 2016), for inhomogeneous elastic properties in the crosssection, for the presence of natural curvature or twist (Freddi et al, 2016) or more generally for the existence of inhomogeneous pre-stress in the cross-section (Lestringant and Audoly, 2017). As the classical rod models are inapplicable if the cross-section itself is a slender 2d domain, specific models have been derived, e.g., to address inextensible ribbons (Sadowsky, 1930;Wunderlich, 1962), as well as thin walled beams having a flat (Freddi et al, 2004) or curved (Hamdouni and Millet, 2006) cross-section.…”