4D Printing of Programmable Digital Metamaterials

TL;DR

This paper introduces a novel 3D printing methodology for creating programmable 4D shape-transforming sheets with independent control over geometry and curvature, enabling advanced shape-morphing materials.

Contribution

It presents a new approach for fabricating digitized 4D-printed structures with precise control over shape transformation, addressing a key challenge in the field.

Findings

Successful fabrication of responsive sheets with programmable shape change

Independent control over lateral geometry and curvature achieved

Potential applications in programmable materials and multi-material systems

Abstract

Advances in 3D printing technology now enable the precise positioning of microscopic material voxels to form complex structures. Combined with emerging multi-material capabilities and printable responsive materials, this opens new possibilities for digital composite materials and 3D printing of shape-transforming structures, or 4D printing. Building upon these advancements, we devise a novel methodology for crafting digitized 4D-printed shape-transforming sheets. We 3D print responsive sheets composed of two layers, each consisting of active and passive voxels meticulously positioned to form thin structures that can be actuated on demand. Our approach solves a long-standing problem in the field, i.e., the independent and simultaneous programming of lateral geometry and reference curvature. This unprecedented control over the resulting shape unlocks new opportunities in synthetic shape-morphing materials, with potential applications in programmable mechanical properties and multi-material systems.