Effective continuum models for the buckling of non-periodic architected sheets that display quasi-mechanism behaviors

Abstract

In this work, we construct an effective continuum model for architected sheets that are composed of bulky tiles connected by slender elastic joints. Due to their mesostructure, these sheets feature quasi-mechanisms -low-energy local kinematic modes that are strongly favored over other deformations. In sheets with non-uniform mesostructure, kinematic incompatibilities arise between neighboring regions, causing out-of-plane buckling. The effective continuum model is based on a geometric analysis of the sheets' unit cells and their energetically favorable modes of deformation. Its major feature is the construction of a strain energy that penalizes deviations from these preferred modes of deformation. The effect of non-periodicity is entirely described through the use of spatially varying geometric parameters in the model. Our simulations capture the out-of-plane buckling that occurs in non-periodic specimens and show good agreement with experiments. While we only consider one class of quasi-mechanisms, our modeling approach could be applied to a diverse set of shape-morphing systems that are of interest to the mechanics community.

Continuum field theory for the deformations of planar kirigami

“…What about the role of heterogeneity [26,27,36,37]? Can coarsegraining lead to constitutive models for mechanical metamaterials, common to practical engineering [38,39], or to effective descriptions of their dynamics [40]? While there are many avenues left to explore, our work on the soft modes of planar kirigami highlights new physics and is a convincing step towards the discovery of a continuum theory for mechanical metamaterials at large.…”