Séminaire PMMH : Marcelo Dias (James Madison University)

2 juin 2017 11:00 » 12:00 — Bureau d’Etudes

Thin Elastic Structures : A roadmap from forms to functions

Thin elastic structures (e.g. plates and shells) have stimulated new approaches and applications to mechanical metamaterials as well as brought to light many fundamental questions in our understanding of shape and function. Insights of what functionality roles these structures play comes from connections between geometry and mechanics. In this talk I will attempt to discuss two representative problems in this field : (i) Kirigami (art cutting paper) mechanics and (ii) biomechanics.
(i) With a focus on the design of thin sheets patterned with cracks (cuts), we will discuss how these structures reveal new effectively non-linear and anisotropic responses to external forces and strains, thus opening the path to practical problems in linear actuation.
(ii) When humans push off against the ground during locomotion, the foot transmits the ground reaction force from the forefoot to the heel joint. Such loading causes the foot to bend in the longitudinal direction, severely so for other primates and people with flat feet. We find that the transverse arch is the key structural element of the foot that stiffens it to such deformation and thereby facilitates propulsion.

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