Surface tension and the Mori-Tanaka theory of non-dilute soft composite solids

Abstract

Eshelby's theory is the foundation of composite mechanics, allowing calculation of the effective elastic moduli of composites from a knowledge of their microstructure. However it ignores interfacial stress and only applies to very dilute composites -- i.e. where any inclusions are widely spaced apart. Here, within the framework of the Mori-Tanaka multiphase approximation scheme, we extend Eshelby's theory to treat a composite with interfacial stress in the non-dilute limit. In particular we calculate the elastic moduli of composites comprised of a compliant, elastic solid hosting a non-dilute distribution of identical liquid droplets. The composite stiffness depends strongly on the ratio of the droplet size, $R$, to an elastocapillary length scale, $L$. Interfacial tension substantially impacts the effective elastic moduli of the composite when $R/L\lesssim 100$. When $R<3L/2$ ($R=3L/2$) liquid inclusions stiffen (cloak the far-field signature of) the solid.

References in corpus (4)

• Stiffening solids with liquid inclusions
• Large deformations of a soft porous material
• Fluid-driven deformation of a soft granular material
• Interfacial tension and a three-phase generalized self-consistent theory of non-dilute soft composite solids

Cited by in corpus (2)

• Solid-Liquid Composites for Soft Multifunctional Materials
• Surface tension and a self-consistent theory of soft composite solids with elastic inclusions