Programmable multistability for 3D printed reinforced multifunctional composites with reversible shape change

TL;DR

This paper introduces a 3D printed composite material with programmable multistability and reversible shape change, enabling complex morphing and functional properties in stiff lightweight composites through microstructuring and thermal actuation.

Contribution

It develops a novel composite ink for direct-ink-writing that achieves multistability and reversible shape morphing in reinforced polymers, expanding 4D printing capabilities to stiffer materials.

Findings

Microstructuring induces local anisotropy and prestress for multistability.

The composite exhibits reversible shape change around its glass transition temperature.

Shape-dependent functionalities like electrical conductivity can be integrated.

Abstract

4D printing empowers 3D printed structures made of hydrogels, liquid crystals or shape memory polymers, with reversible morphing capabilities in response to an external stimulus. To apply reversible shape-change to stiff lightweight materials such as microfiber reinforced polymers, we developed a composite ink that can be printed using direct-ink-writing (DIW), and that exhibits multistability around its glass transition temperature. After curing at room temperature, the flat print thermally morphs into a predefined shape upon heating at an actuation temperature and cooling down. The sample can then reversibly snap between multiple stable shapes when heated above its glass transition temperature thanks to prestress-induced multistability. The key that allows thermal morphing and prestress multistability is the microstructuring of the 3D printed composites by shear-induced alignment of reinforcing microfibers. This alignment leads to local anisotropy in thermomechanical properties and the build-up of prestresses. Furthermore, the ink composition can be tuned to generate shape-dependant reversible functional properties, such as electrical conductivity. Based on finite element modelling and experimental results, the method proposed here can be used for variety of compositions and designs, for applications where stiffness, reconfigurability and shape-dependent functionalities can be exploited.