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Capillary control of collapse in soft composite columns
Phys. Rev. Materials 5, 055603 – Published 20 May, 2021
DOI: https://doi.org/10.1103/PhysRevMaterials.5.055603
Abstract
Euler buckling is the elastic instability of a column subjected to longitudinal compression forces at its ends. The buckling instability occurs when the compressing load reaches a critical value, and an infinitesimal fluctuation leads to a large amplitude deflection. Since Euler's original study, this process has been extensively examined in homogeneous, isotropic, linear-elastic solids. Here, we examine the nature of the buckling in inhomogeneous soft composite materials. In particular, we consider a soft host with liquid inclusions both large and small relative to the elastocapillarity length, which lead to softening and stiffening, respectively, of a homogeneous composite. However, by imposing a gradient of the inclusion volume fraction or by varying the inclusion size we can deliberately manipulate the spatial structure of the composite properties of a column and thereby control the nature of Euler buckling.
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