Micromechanics of elastic buckling of a colloidal polymer layer on a soft substrate: experiment and theory

作者：Tordesillas Antoinette^*; Carey David; Croll Andrew B; Shi Jingyu; Gurmessa Bekele

来源：Granular Matter, 2014, 16(2): 249-258.

DOI：10.1007/s10035-013-0459-z

• Localisation
• Periodicity
• Bifurcation
• Instability
• Buckling

We study the buckling instability of a colloidal particle layer adhered to an elastic substrate using an integrated experimental and theoretical approach. Experiments using monodisperse colloid-scale spherical particles made of polystyrene and silica, show that the wavelength of the initial (critical) buckling mode is independent of particle modulus and linearly dependent on particle radius-in contradiction with the predictions of the prevailing continuum model. We developed a granular model of the particle layer using structural mechanics techniques. The granular model predicts the observed wavelength of the initial, critical buckling mode within the estimated range of parameter values for the experiment. The evolution of this mode into the post-buckling regime is examined. Results highlight the crucial role of material discreteness in the mechanical response, and the need for accurate methods of estimating parameters for the particle-scale resistances against buckling.

• 出版日期2014-4