Experimental investigations of a stress intensity factor based descriptionof the adhesion of viscoelastic materials

Citation
Jm. Baney et al., Experimental investigations of a stress intensity factor based descriptionof the adhesion of viscoelastic materials, LANGMUIR, 17(3), 2001, pp. 681-687
Citations number
22
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
LANGMUIR
ISSN journal
07437463 → ACNP
Volume
17
Issue
3
Year of publication
2001
Pages
681 - 687
Database
ISI
SICI code
0743-7463(20010206)17:3<681:EIOASI>2.0.ZU;2-4
Abstract
The relationship between the Tate at which cracks heal and the stress field surrounding the crack tip has previously been suggested as a way to charac terize the adhesive properties of viscoelastic systems. Crucial to this des cription of adhesion is a predicted unique relationship between the crack h ealing velocity and a stress intensity factor which completely characterize s the stress field; it has been shown that this relationship should be inde pendent of the applied loading history. We have experimentally investigated this characterization of adhesion using JKR-type contact mechanics methods . The experimental results indicate a dependence on the loading rate in the relationship between the crack healing velocity and the stress intensity f actor, contrary to the predictions of the theory. It is suggested that this may be due to nonlinear material behavior near the crack tip, as the theor y is based on linear viscoelasticity. More ideal systems may produce better agreement between theory and experiment.