Dynamics of microscale granular crystals (INVITED)

Abstract eng:
The contact-based dynamics of ordered and reduced-dimensional arrays of microspheres, or “microscale granular crystals,” are investigated. Mono- and multilayer microscale granular crystals are fabricated on substrates using self-assembly fabrication methods, and their dynamics are characterized using laser ultrasonic techniques. The observed dynamics are compared with analytical and computational models. As part of these studies, we have made several recent findings. We revealed interparticle-contact-mediated dynamics of microsphere monolayers that occur within the sagittal plane, including an out-of—plane mode of the monolayer and two transverse-rotational modes. We characterized the variation of the out-of—plane contact resonance with microsphere radius and oscillation amplitude. Finally, we studied plane and surface wave propagation in multilayer microscale granular crystals. These studies will lead to a better understanding of microscale contact dynamics and to a new class of microstructured materials for stress wave tailoring that can be assembled en—masse via self-assembly fabrication techniques.

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