In order to investigate the effect of asperity and substrate deformations on micro-contact characteristics of a hard-coating surface, contact stiffnesses of asperity and substrate were solved with Hertz contact theory, the deformation of asperity was determined with the fixed point iteration method, and the stiffness model for contact deformation of asperity was established, finally a new surface micro-contact model was established through parallel coupling. To verify the correctness of the new model to describe contact characteristics of rough surface with a hard coating, finite element models with different sizes and materials for asperity was established. Through comparing analysis results of the new model, Hertz model and the finite element models, it was found that when materials of substrate and asperity are different, stress distribution of asperity-substrate system is not uniform, contact force on asperity surface is smaller than that when materials of asperity and substrate are the same, the maximum stress is larger than that when materials are the same; when the deformation is very small, Hertz model solution and the new model one agree well with analysis results of finite element models; with increase in deformation, finite element model analysis results and the new model solution start to deviate Hertz model solution, but the new model solution is always close to the finite element model analysis results.
李 玲 张 健 阮晓光 蔡安江. 含硬涂层结构的表面微观接触新模型[J]. 振动与冲击, 2018, 37(3): 195-201.
LI Ling ZHANG Jiang RUAN Xiaoguang CAI Anjiang. A new micro-contact model for rough surface with a hard-coating. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(3): 195-201.
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