"The Elastic Stability of Multi-State Solids and Structures"
Abstract: Many well-known examples exist of elastic structures displaying distinctly different states under load, most commonly when they buckle. There is considerable current interest in the soft materials community to exploit the large strain capabilities of these materials to design configurations capable of switching from one deformation state to another for functional purposes. In the world of structures, there are also efforts are underway to exploit multi-state configurations. In my seminar, I will discuss recent research on the stability of multiple-state structures and attempt to highlight some of outstanding issues and commonalities even though the specific examples are very different. The examples are surface wrinkling/creasing of an elastomer substrate subject to mechanical compression, buckling of cylindrical shells under axial compression, and multiple states of rings.
Bio: John Hutchinson received his undergraduate education in engineering mechanics at Lehigh University and his graduate education in mechanical engineering at Harvard University. He joined the Harvard faculty in the School of Engineering and Applied Sciences in 1964 and is currently the Abbott and James Lawrence Professor of Engineering Emeritus. Hutchinson and his collaborators work on problems in solid mechanics concerned with engineering materials and structures. Buckling, structural stability, elasticity, plasticity, fracture, and micro-mechanics are all central in their research. Ongoing research activities are: (1) development of a mechanics framework for assessing the durability of thermal barrier coatings for gas turbine engines, (2) fracture mechanics of tough ductile alloys, (3) the mechanics of thin films, coatings, and multilayers, and (4) stability phenomena in plates, shells, and soft materials. Further information and publications can be downloaded at https://groups.seas.harvard.edu/hutchinson/