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  • Open Access

Capillary control of collapse in soft composite columns

Marc Suñé*

John S. Wettlaufer†

  • Nordita, Royal Institute of Technology and Stockholm University, Hannes Alfvéns väg 12, SE-106 91 Stockholm, Sweden

  • Yale University, New Haven, Connecticut 06520, USA and Nordita, Royal Institute of Technology and Stockholm University, Hannes Alfvéns väg 12, SE-106 91 Stockholm, Sweden

  • *marc.sune.simon@su.se
  • †john.wettlaufer@su.se; john.wettlaufer@yale.edu

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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