Biologically inspired crack trapping for enhanced adhesion.

Abstract:

:We present a synthetic adaptation of the fibrillar adhesion surfaces found in nature. The structure consists of protruding fibrils topped by a thin plate and shows an experimentally measured enhancement in adhesion energy of up to a factor of 9 over a flat control. Additionally, this structure solves the robustness problems of previous mimic structures and has preferred contact properties (i.e., a large surface area and a highly compliant structure). We show that this geometry enhances adhesion because of its ability to trap interfacial cracks in highly compliant contact regimes between successive fibril detachments. This results in the requirement that the externally supplied energy release rate for interfacial separation be greater than the intrinsic work of adhesion, in a manner analogous to lattice trapping of cracks in crystalline solids.

authors

Glassmaker NJ,Jagota A,Hui CY,Noderer WL,Chaudhury MK

doi

10.1073/pnas.0703762104

subject

Has Abstract

pub_date

2007-06-26 00:00:00

pages

10786-91

issue

26

eissn

0027-8424

issn

1091-6490

pii

0703762104

journal_volume

104

pub_type

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