Mechanical properties of 2D aggregates of oil droplets as model mono-crystals

We investigate the elastic and yielding properties of two dimensional defect-free mono-crystals made of highly monodisperse droplets. Crystals are compressed between two parallel boundaries of which one acts as a force sensor. As the available space between boundaries is reduced, the crystal goes through successive row-reduction transitions. For small compression forces, the crystal responds elastically until a critical force is reached and the assembly fractures in a single catastrophic global event. Correspondingly there is a peak in the force measurement associated with each row-reduction. The elastic properties of ideal mono-crystal samples are fully captured by a simple analytical model consisting of an assembly of individual capillary springs. The yielding properties of the crystal are captured with a minimal bond breaking model.

Automated summary

This study investigates the elastic and yielding properties of defect-free mono-crystals made of highly monodisperse droplets. The crystals undergo successive row-reduction transitions as they are compressed, eventually fracturing in a catastrophic event. The elastic properties are captured by a simple analytical model of capillary springs, while the yielding properties are described by a minimal bond breaking model.