Randomly stacked open cylindrical shells as functional mechanical energy absorber
Résumé
Structures with artificially engineered mechanical properties, often called mechanical meta-
materials, are interesting for their tunable functionality. Various types of mechanical meta-
materials have been proposed in the literature, designed to harness light or magnetic
interactions, structural instabilities in slender or hollow structures, and contact friction.
However, most of the designs are ideally engineered without any imperfections, in order to
perform deterministically as programmed. Here, we study the mechanical performance of
randomly stacked cylindrical shells, which act as a disordered mechanical metamaterial.
Combining experiments and simulations, we demonstrate that the stacked shells can absorb
and store mechanical energy upon compression by exploiting large deformation and relo-
cation of shells, snap-fits, and friction. Although shells are oriented randomly, the system
exhibits statistically robust mechanical performance controlled by friction and geometry. Our
results demonstrate that the rearrangement of flexible components could yield versatile and
predictive mechanical responses.
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