Tailorable Twisting of Biomimetic Scale-Covered Substrate

TL;DR

This paper presents an analytical and simulation-based study of how biomimetic scale-covered substrates can have their torsional rigidity tailored through geometric design, revealing a reversible, regime-dependent mechanical response.

Contribution

It introduces a new analytical model and FE validation for the tailorable twisting behavior of biomimetic scale-covered substrates, enabling design of customizable metamaterials.

Findings

Significant increase in torsional rigidity observed.

Mechanical response varies between linear, nonlinear, and rigid regimes.

Response is highly tunable via geometric arrangement of scales.

Abstract

In this letter, we investigate the geometrically tailorable elasticity in the twisting behavior of biomimetic scale-covered slender soft substrate. Motivated by our qualitative experiments showing a significant torsional rigidity increase, we develop an analytical model and carry out extensive finite element (FE) simulations to validate our model. We discover a regime differentiated and reversible mechanical response straddling linear, nonlinear, and rigid behavior. The response is highly tailorable through the geometric arrangement and orientation of the scales. The work outlines analytical relationships between geometry, deformation modes and kinematics, which can be used for designing biomimetic scale-covered metamaterials.