A normal contact stiffness model of joint surface based on the fractal theory

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (8) : 218-224.

CHEN Hongxu DONG Guanhua YIN Qin TAN Feng YIN Guofu

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Abstract

A joint surface normal contact stiffness model was established.The model was based on the modified fractal theory and the size of asperity was defined by the scaling factor.Considering the contact deformation process of asperity, an error compensation method was used to correct the Hertz contact model.Numerical simulation was carried out to obtain the relations between normal contact stiffness and the fractal dimension.A bolt joint surface experiment was carried out to verify the correctness of the theoretical model.Firstly, according to the measured fractal parameters of the bolt joint surface, normal contact stiffness was solved.Then a modal experiment was carried out by using m+p noise and a vibration testing system.Finally, the results of the experiment and the finite element simulation were compared.The experiment results show that the first 8 modal shapes of the theoretical model and the experimental model are the same, and the error of the natural frequencies are within the range of -10.2%—-1%.

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fractal / joint surface / normal contact stiffness / modal experiment

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CHEN Hongxu DONG Guanhua YIN Qin TAN Feng YIN Guofu. A normal contact stiffness model of joint surface based on the fractal theory[J]. Journal of Vibration and Shock, 2019, 38(8): 218-224

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