期刊
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
卷 141, 期 4, 页码 -出版社
ASME
DOI: 10.1115/1.4042505
关键词
adhesion; elastic layer; surface roughness; contact behavior
资金
- National Natural Science Foundation of China [51805269, 51775044, 51506098, 51605008]
- Key Research and Development Plan of Jiangsu Province [BE2017026]
- Youth Science and Technology Innovation Foundation of Nanjing Forestry University [CX2017007]
A deterministic adhesive model for the contact between an elastic layered medium with surface roughness and a smooth elastic microsphere was developed on the basis of the Lennard-Jones surface force law. Through numerical simulations, the adhesive contact behavior of the layered medium with the measured three-dimensional (3D) surface topography was comparatively analyzed with that of the homogeneous medium. Furthermore, the contact characteristics of the layered medium with pre-assigned roughness parameters were investigated with the aid of a computer-generated technique for simulating surface roughness. Results showed that the pull-off force for the contact problem involving rough surfaces was influenced by the contact location, and the average value for the contact between an alumina (SiO2) microsphere and a diamond-like carbon/silicon (DLC/Si)-layered medium was smaller than that for the contact between a SiO2 microsphere and a Si homogeneous half-space. In addition, the effect of the diamond-like carbon (DLC) layer on reducing adhesion was smaller than that of the surface roughness. Finally, the average pull-off force for a DLC/Si-layered medium with computer-generated surface roughness rapidly decreased; however, it eventually became almost unchangeable with the increase in the root-mean-square (RMS) deviation.
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