▣ Title : Materials strength from atomic view and insight on biological hierarchical nano-composite
▣ Speaker : Seung-Hwa Ryu (KAIST)
▣ Date & Time : Friday, May 29 (2:00 ~ 3:30pm)
▣ Place : LG Research Building, Room #101
▣ Host : Prof. Yoon-Young Chung (T.2225)
▣ Abstract :
Load-bearing biological structures such as spider silk, lotus leaf, bone, and shells achieve extraordinary mechanical properties such as high toughness, high hydrophobicity, and high strength by forming hierarchical nanocompositestructures. This talk is intended to briefly discuss the secret behind such extraordinary properties for non-mechanical engineers. In the first half of this talk, I will give introductory lecture on the materials strength from atomic view. In the second half, I will introduce elementary fracture mechanics concepts to gain some insights on the role of 'hierarchical' 'nano'-'composite' on the toughness and strong biological structures. Two research projects will be briefly introduced that attempt to make biologically inspired hierarchical nanocomposites, with a focus on the modelling efforts: (1) structure and mechanical properties of silk-inpiredflow-assembled artificial spider silk, (2) lotus leaf-inspired reversible crumpling of large area graphene and its multifunctionality. The mechanical insights from this lecture may be applied to design mechanically reliable wearable and stretchable devices.