Analysis of Real Contact Area and Contact Loading between a Fractal Rough Surface and a Flat Plane

• Main Authors: Shyy, Jaan Horng, 史展宏
• Other Authors: You H. I.
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/66498905238345447590

碩士 === 國立中興大學 === 機械工程學系 === 85 === In the present paper, the topography of rough surface is simulated by using thefractal geometry. The mathematically created rough surface is brought in contact with a flat surface under a normal loading. the relationship of real contact area versus the contact loading was then investigated.In general, the governing parameters of the fractal geometry,i.e., D1,A1 and Wcare obained from the power spectrum of the rough surface being simulated. Thereal contact area and contact loading are calculated by virtue of the Hertziantheory. The criterion for the contact asperity being elastic or plastic is provided.It is found that the height distribution of the rough surface created by thefractal geometry has a random nature which satisfiesthe normal distribution. Variation in the parameter D1 is the primary role to simulate the rough surface. Due to plastic deformation, the rough surface creates rapidly the conatct area under loading. Constant real contact pressure, which is larger fora rough surface, is obained for every contact surfaces.