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Greenwood JA, Johnson KL. Oscillatory loading of a viscoelastic adhesive contact. J Colloid Interface Sci. 2005;296(1):284-91doi: 10.1016/j.jcis.2005.08.069.
Greenwood, J. A., & Johnson, K. L. (2006). Oscillatory loading of a viscoelastic adhesive contact. Journal of colloid and interface science, 296(1), 284-91. https://doi.org/10.1016/j.jcis.2005.08.069
Greenwood, J A, and Johnson, K L. "Oscillatory loading of a viscoelastic adhesive contact." Journal of colloid and interface science vol. 296,1 (2006): 284-91. doi: https://doi.org/10.1016/j.jcis.2005.08.069
Greenwood JA, Johnson KL. Oscillatory loading of a viscoelastic adhesive contact. J Colloid Interface Sci. 2006 Apr 01;296(1):284-91. doi: 10.1016/j.jcis.2005.08.069. Epub 2005 Oct 03. PMID: 16203010.
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J Colloid Interface Sci. 2006 Apr 01;296(1):284-91. doi: 10.1016/j.jcis.2005.08.069. Epub 2005 Oct 03.

Oscillatory loading of a viscoelastic adhesive contact.

Journal of colloid and interface science

J A Greenwood, K L Johnson

Affiliations

  1. Department of Engineering, Cambridge University, Trumpington Street, Cambridge, CB2 1PZ, UK. [email protected]

PMID: 16203010 DOI: 10.1016/j.jcis.2005.08.069

Abstract

The cycle of loading and unloading of a spherically-tipped probe against an adhesive, viscoelastic plane specimen is studied by numerical integration of the relations between crack speed and apparent surface energy previously found for a linear 3-element viscoelastic solid with a Maugis-Dugdale law of force across the crack. It is found that even when the rate of loading is so slow that the loading and unloading curves almost coincide, suggesting purely elastic behaviour, the pull-off force can be appreciably greater than the elastic (JKR) value. When the normal force is modulated with a small amplitude sinusoidal variation during unloading--in order to find the contact stiffness--the contact radius barely changes, and the stiffness is close to that for a rigid flat punch instead of having the expected JKR value.

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