▣ 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.