Nonlinear Physical Chemistry Unit, Universit Libre de Bruxelles, B-1050 Bruxelles, Belgium.
Laboratoire de Physique et Mécanique des Milieux Hétérogènes, CNRS, ESPCI Paris, Université PSL, Sorbonne Université, Université de Paris, F-75005 Paris, France.
Phys Rev Lett. 2021 Oct 15;127(16):168002. doi: 10.1103/PhysRevLett.127.168002.
We show that ribbed elastic strips under tension present large spontaneous curvature and may close into tubes. In this single material architectured system, transverse bending results from a bilayer effect induced by Poisson contraction as the textured ribbon is stretched. Surprisingly, the induced curvature may reverse if ribs of different orientations are considered. Slender ribbed structures may also undergo a nontrivial buckling transition. We use analytical calculations to describe the evolution of the morphology of the ribbon and the transitions between the different experimental regimes as a function of material properties, geometrical parameters, and stretching strain. This scale-independent phenomenon may help the manufacturing of tubular textured structures or easily controllable grippers at small scale.
我们表明，受拉的有肋弹性带会呈现出较大的自发曲率，并可能会自行卷曲成管状。在这种单一材料的结构体系中，由于受纹理带拉伸时泊松收缩引起的双层效应，导致了横向弯曲。令人惊讶的是，如果考虑不同取向的肋条，所诱导的曲率可能会发生反转。细长的肋状结构也可能经历非平凡的屈曲转变。我们使用解析计算来描述带材的形态演变以及不同实验状态之间的转变，这些转变与材料性质、几何参数和拉伸应变有关。这种与尺度无关的现象可能有助于制造管状纹理结构或在小尺度上实现易于控制的夹具。
