Buckly-grains: a model system for elucidating interplay of extreme deformations and reconfigurations

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The AY2022 was devoted to the implementation of the experimental set-up and development of the analysis tools.Experimental achievements (~6 months). Fabrication of the compressible ring-shaped grains using 3D-printing and moulding. Careful selection and testing of the ring material was necessary to avoid introducing undesirable plastic of viscoelastic deformations. Adaptation and improvement of the shear experimental set-up to acquire the global shear and compression force. Implementation of a Labview process to simultaneously control and synchronize the driving motor, the camera, and the force sensors. Acquisition of datasets varying both the shear amplitude and density of rings.Analysis achievements (~5 months). Development of an image analysis framework. The method detects and separates each ring and measures their tracked position, shape, and neighbourhood. We combine Lagrangian and Eulerian analysis. From these measurements, we explore the interplay between ring deformations and irreversible displacements. Rationalization of the mechanical response of a single ring to indentation by combining a finite element approach using COMSOL and a 1D analytical development.Presentations and publications (~1 month). Presentation of the preliminary results in domestic and international conferences, receiving positive and valuable feedbacks from the community. Outreach conferences to High school students (Science Dialogue) and French researchers. Publication (2) and submission (1) of research projects started before the JSPS fellowship.