|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Bio Nano Interfaces and Engineering Applications
||Nonuniform Breaking of Molecular Bonds, Peripheral Morphology, and Releasable Adhesion by Elastic Anisotropy in Bio-adhesive Contacts
||Yan Liu, Yanfei Gao
|On-Site Speaker (Planned)
When separating two biological surfaces, one way to accomplish releasable adhesion is by the elastic anisotropy of the two materials. Although two-dimensional contacts have been extensively studies analytically, important questions such as the three-dimensional contact morphology, the maximum to minimum pull-off force ratio and the tunability of releasable adhesion cannot be answered. Here we developed a three-dimensional cohesive interface model to simulate the de-adhesion instability and the peripheral morphology before and after the onset of instability. The observation of “stiff-adhere and compliant-release” in 2D analysis is confirmed, but the 2D model significantly overestimate the maximum to minimum pull-off force ratio. The de-adhesion strength is sensitive to the crack morphology and the initial contact shape can be designed to attain a significantly higher maximum-to-minimum pull-off force ratio than a circular contact. The above conclusions can, however, only be achieved when the crack bridging zone is significantly smaller than the contact size.
||Planned: Publication Outside of TMS (Indicate publication title and publisher if known.)