期刊
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
卷 81, 期 5, 页码 -出版社
ASME
DOI: 10.1115/1.4026019
关键词
adhesive contact; rough surface; cohesive zone model; double-Hertz theory; adhesion hysteresis
类别
资金
- National Natural Science Foundation [10925209, 91216201, 10932003]
- 973 Project of China [2010CB832703]
- Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT)
A cohesive zone model for rough surface adhesion is established by combining the double-Hertz model (Greenwood, J. A., and Johnson, K. L., 1998, An Alternative to the Maugis Model of Adhesion Between Elastic Spheres, J. Phys. D: Appl. Phys., 31, pp. 3279-3290) and the multiple asperity contact model (Greenwood, J. A., and Williamson, J. B. P., 1966, Contact of Nominally Flat Surfaces, Proc. R. Soc. Lond. A, 295, pp. 300-319). The rough surface is modeled as an ensemble of noninteracting asperities with identical radius of curvature and Gaussian distributed heights. By applying the double-Hertz theory to each individual asperity of the rough surface, the total normal forces for the rough surface are derived for loading and unloading stages, respectively, and a prominent adhesion hysteresis associated with dissipation energy is revealed. A dimensionless Tabor parameter is also introduced to account for general material properties. Our analysis results show that both the total pull-off force and the energy dissipation due to adhesive hysteresis are influenced by the surface roughness only through a single adhesion parameter, which measures statistically a competition between compressive and adhesive forces exerted by asperities with different heights. It is also found that smoother surfaces with a small adhesion parameter result in higher energy dissipation and pull-off force, while rougher surfaces with a large adhesion parameter lead to lower energy dissipation and pull-off force.
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