Tensegrity-Inspired Polymer Films: Progressive Bending Stiffness through Multipolymeric Patterning

TL;DR

This paper introduces a novel polymer film inspired by tensegrity structures that progressively stiffens under bending, achieved through multipolymer patterning to mimic membrane tensegrity properties.

Contribution

It presents a new multipolymer patterning method to create polymer films with tensegrity-inspired properties that increase stiffness under bending, a feature not previously realized.

Findings

Polymer films exhibit increased bending stiffness due to membrane tension.

Stiffening effect is linked to second moment of area increase at high curvature regions.

Tensegrity-inspired design enables progressive stiffening in polymer materials.

Abstract

Materials with J-shaped stress-strain behavior under uniaxial stretching, where strength increases as deformation progresses, have been developed through various materials designs. On the other hand, polymer materials that progressively stiffen under bending remain unrealized. To address this gap, this study drew inspiration from membrane tensegrity structures, which achieve structural stability by balancing compressive forces in rods and tensile forces in membrane. Notably, some of these structures exhibit increased stiffness under bending. Using a multipolymer patterning technique, we developed a polymer film exhibiting membrane tensegrity-like properties that stiffens under bending. This effect results from membrane tension generated by rod protrusions and an increase in second moment of area at regions with maximum curvature.