Evolution behavior analysis for loading and unloading contact characteristics of fractal rough surface

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (23) : 46-53.

LIU Kaian, XU Yingqiang, WU Zhenghai, LI Wanzhong

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Abstract

The evolution of loading and unloading contact characteristics of rough surfaces is of great importance to study on interface contact mechanical performance.Here, based on the rough surface fractal theory, according to the modified dual-parameter Weierstrass-Mandelbrot (W-M) fractal function, a 3-D fractal rough surface digital model was generated with the point cloud processing technique and Coons patch curved surface fitting method.According to Prandtl-Reuss constitutive relation and von Mises yield criterion, bilinear isotropic reinforced nonlinear materials were used to establish an accurate finite element model for a fractal rough surface contacting a rigid plane.Effects of fractal dimension and size parameters on contact load, contact area and deformation during loading and unloading were explored.The kernel density estimation method was used to analyze evolution laws of morphologic height parametric distribution of rough surface under different contact states, and reveal the mechanism of fractal rough surface contact characteristics from standpoints of fractal parameters and energy.The results provided a theoretical basis for further studying rough surface’s contact mechanical performance, interface load transfer efficiency and enhancement mechanism.

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fractal surface / elastic-plastic contact / loading-unloading / contact characteristics

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LIU Kaian, XU Yingqiang, WU Zhenghai, LI Wanzhong. Evolution behavior analysis for loading and unloading contact characteristics of fractal rough surface[J]. Journal of Vibration and Shock, 2019, 38(23): 46-53

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