Stress transmission in planar disordered solid foams

TL;DR

This paper applies a novel theoretical framework to analyze stress transmission in planar disordered solid foams, revealing microstructure-dependent stress fields and redefining structure-property relationships in these materials.

Contribution

It introduces a new approach mapping cellular solids to granular assemblies, linking stress directly to microstructural disorder without relying on stress-strain data.

Findings

Stress field determined by microstructure alone

New fabric tensor couples stress to local disorder

Reinterprets cellular solids as a new state of matter

Abstract

Stress transmission in planar open-cell cellular solids is analysed using a recent theory developed for marginally rigid granular assemblies. This is made possible by constructing a one-to-one mapping between the two systems. General trivalent networks are mapped onto assemblies of rough grains, while networks where Plateau rules are observed, are mapped onto assemblies of smooth grains. The constitutive part of the stress transmission equations couples the stress directly to the local rotational disorder of the cellular structure via a new fabric tensor. An intriguing consequence of the analysis is that the stress field can be determined in terms of the microstructure alone independent of stress-strain information. This redefines the problem of structure-property relationship in these materials and poses questions on the relations between this formalism and elasticity theory. The deviation of the stress transmission equations from those of conventional solids has been interpreted in the context of granular assemblies as a new state of solid matter and the relevance of this interpretation to the state of matter of cellular solids is discussed.