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Science 26 January 1996:
Vol. 271. no. 5248, pp. 482 - 484
DOI: 10.1126/science.271.5248.482
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Reports

Energy Dissipation During Rupture of Adhesive Bonds

Arlette R. C. Baljon and Mark O. Robbins

Molecular dynamics simulations were used to study energy-dissipation mechanisms during the rupture of a thin adhesive bond formed by short chain molecules. The degree of dissipation and its velocity dependence varied with the state of the film. When the adhesive was in a liquid phase, dissipation was caused by viscous loss. In glassy films, dissipation occurred during a sequence of rapid structural rearrangements. Roughly equal amounts of energy were dissipated in each of three types of rapid motion: cavitation, plastic yield, and bridge rupture. These mechanisms have similarities to nucleation, plastic flow, and crazing in commercial polymeric adhesives.


Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA.


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