期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 96, 期 -, 页码 18-28出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2016.07.008
关键词
Rough surface; Contact; Strain gradient plasticity; Pressure distribution
资金
- Foundation for Fundamental Research on Matter (FOM), Netherlands Organisation for Scientific Research (NWO) [13POF07-1]
- National Basic Research Program of China [2012CB937500]
- National Natural Science Foundation of China [11202214, 91216108, 11572329]
- State Key Laboratory of Mechanics and Control of Mechanical Structures (NUAA Grant) [MCMS-0114G01]
- State Key Laboratory of Structural Analysis for Industrial Equipment (DUT Grant) [GZ15116]
From a microscopic point of view, the real contact area between two rough surfaces is the sum of the areas of contact between facing asperities. Since the real contact area is a fraction of the nominal contact area, the real contact pressure is much higher than the nominal contact pressure, which results in plastic deformation of asperities. As plasticity is size dependent at size scales below tens of micrometers, with the general trend of smaller being harder, macroscopic plasticity is not suitable to describe plastic deformation of small asperities and thus fails to capture the real contact area and pressure accurately. Here we adopt conventional mechanism-based strain gradient plasticity (CMSGP) to analyze the contact between a rigid platen and an elasto-plastic solid with a rough surface. Flattening of a single sinusoidal asperity is analyzed first to highlight the difference between CMSGP and J(2) isotropic plasticity. For the rough surface contact, besides CMSGP, pure elastic and J(2) isotropic plasticity analysis is also carried out for comparison. In all cases, the contact area A rises linearly with the applied load, but with a different slope which implies that the mean contact pressures are different. CMSGP produces qualitative changes in the distributions of local contact pressures compared with pure elastic and J(2) isotropic plasticity analysis, furthermore, bounded by the two. (C) 2016 Elsevier Ltd. All rights reserved.
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