题目：Buckling and Delamination of Thin Films and Graphene
报告人：黄锐教授，美国德州大学奥斯汀分校航空工程系
时间： 6月24日上午10:00-11:00
地点： 力学一楼二楼小会议室
举办单位：材料力学行为与设计中科院重点实验室
报告摘要：
When the surface of a soft material is coated with a stiff thin film, compression induced buckling instability results in surface wrinkles, and wrinkling of the thin film may lead to fracture and delamination. In this talk, I will first review the basic mechanics underlying the elastic, thermoelastic, viscous and viscoelastic wrinkling of thin films. A few applications of thin film wrinkling will be discussed, as well as the more recent efforts in the studies of advanced modes beyond wrinkling, including localized folding and creasing. The second part of the talk will focus on wrinkling induced delamination of thin films. The critical condition for initiation of wrinkle-induced delamination is predicted by an analytical formula based on a strength criterion. Subsequent growth of the delamination crack is simulated by a cohesive interface model, including co-evolution of wrinkling and buckle-delamination. The third and final part of the talk will discuss the interfacial properties of graphene, an ultimate thin film of one atom thick. We have developed a simple analytical model for the van der Waals forces between a monolayer graphene and an amorphous substrate, with which a traction-separation relation is derived for the graphene/substrate interface. The effects of surface roughness on adhesion of graphene membranes are discussed along with recent efforts to measure the interfacial properties of graphene experimentally.
个人简介：
Rui Huang received his Bachelor degree in Theoretical and Applied Mechanics from the University of Science and Technology of China in 1994 and his PhD degree in Civil and Environmental Engineering, with specialty in Mechanics, Materials, and Structures, from Princeton University in 2001. He joined the University of Texas at Austin as an Assistant Professor in September 2002 and was promoted to Associate Professor with tenure in 2008. He currently holds the endowed position of Pearlie Dashiell Henderson Centennial Fellowship in Engineering at UT Austin.