User login

Navigation

You are here

Buckling and twisting of advanced materials into morphable 3D mesostructures

Hangbo Zhao's picture

In this work, we present concepts that allow controlled introduction of buckling and twisting deformations to the mechanically guided assembly of 3D mesostructures.

Abstract: Recently developed methods in mechanically guided assembly provide deterministic access to wide-ranging classes of complex, 3D structures in high-performance functional materials, with characteristic length scales that can range from nanometers to centimeters. These processes exploit stress relaxation in prestretched elastomeric platforms to affect transformation of 2D precursors into 3D shapes by in- and out-of-plane  translational displacements. This paper introduces a scheme for introducing local twisting deformations into this process, thereby providing access to 3D mesostructures that have strong, local levels of chirality and other previously inaccessible geometrical features. Here, elastomeric assembly platforms segmented into interconnected, rotatable units generate in-plane torques imposed through bonding sites at engineered locations across the 2D precursors during the process of stress relaxation. Nearly 2 dozen examples illustrate the ideas through a diverse variety of 3D structures, including those with designs inspired by the ancient arts of origami/kirigami and with layouts that can morph into different shapes. A mechanically tunable, multilayered chiral 3D metamaterial configured for operation in the terahertz regime serves as an application example guided by finite-element analysis and electromagnetic modeling.

Link: https://www.pnas.org/content/116/27/13239

AttachmentSize
PDF icon pnas.1901193116.pdf4.57 MB
Subscribe to Comments for "Buckling and twisting of advanced materials into morphable 3D mesostructures"

More comments

Syndicate

Subscribe to Syndicate