Prof. Julian Rimoli应邀来访,并做题为“Discontinuous compression structures: From tensegrity planetary landers to lightweight metamaterials”的学术报告


The term tensegrity, derived trom tensional integrity, refers to a ccrtain class of structural systems composed of bars and strings. Through adequate pre-stressing of their string members, tensegrity structures generally become mechanically stable. Traditional approaches for modeling their behavior assume that (i)bars are perfectly rigid. (ii)cables are linear elastic, and (iii) bars experience pure compression and strings pure tension. In addition, a common design constraint is to assume that the structure would fail whenever any ot its bars reaches the corresponding Euler buckling load. In reality, these assumptions tend to break down in the presence of dynamic events. In the first part of this talk. we will introduce a physics-based reduced-order model to study aspects related to the dynamic and nonlinear response of tensegrity bascd planetary landers. We will then adopt our model to show how, under dynamic events, buckling of individual members of a tensegrity structure does not necessarily imply structural failure. thus signilicantly expanding the design space for such vehicles. In the second part of this talk, we will show how lessons learned from our tensegrity planetary lander can be translated into to the development novel metamaterials. We will introduce the first known class-two 3D tensegrity metamaterial. and show that this new topology exhibits unprecedented static and dynamic mechanical properties.