Critical Contact Parameters Continuous for Elastoplastic Fractal Model of Normal Contact stiffness of Rough Surfaces

Zhang Xue-liang Wang Nan-shan Lan Guo-sheng Wen Shu-hua Liu Li-qing Niu Zuo-zheng

Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (9) : 72-77.

PDF(1494 KB)
PDF(1494 KB)
Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (9) : 72-77.
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Critical Contact Parameters Continuous for Elastoplastic Fractal Model of Normal Contact stiffness of Rough Surfaces

  • Zhang Xue-liang Wang Nan-shan Lan Guo-sheng Wen Shu-hua Liu Li-qing Niu Zuo-zheng
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Abstract

Based on MB fractal model and its modified model, on the foundation of elastic and plastic regime, and considering the elastoplastic regime, an elastoplastic fractal model of normal contact stiffness of rough surfaces, which is continuous for critical contact parameters and considers the influence of domain extension factor, was proposed. Numerical simulation results show elastoplastic regime has an obvious effect on normal contact stiffness and dimensionless normal contact stiffness of elastoplastic fractal model is much more than that of only considering elastic and plastic regime; dimensionless normal contact stiffness increases with the increment of dimensionless normal load but the varying tendency is convex nonlinear(when fractal dimension D=1.1~1.4) or near linear(when fractal dimension D=1.4~1.9), increases(when fractal dimension D=1.1~1.5) or decreases(when fractal dimension D=1.5~1.9) with the increment of fractal dimension, decreases with the increment of fractal roughness, and increases with the increment of plastic index.

Key words

Joint interfaces / Normal contact stiffness / Elastoplastic / Fractal mode

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Zhang Xue-liang Wang Nan-shan Lan Guo-sheng Wen Shu-hua Liu Li-qing Niu Zuo-zheng. Critical Contact Parameters Continuous for Elastoplastic Fractal Model of Normal Contact stiffness of Rough Surfaces [J]. Journal of Vibration and Shock, 2014, 33(9): 72-77
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