Abstract
The object of this fundamental research will be to reveal the effects of variable coefficient of static friction on the static behavior of disc spring. On account of the complex relationship between friction and normal pressure, based on contact mechanics and fractal theory, a model for predicting variable coefficient of static friction of 3 D fractal surface is induced. Then the method proposed by Curti is improved by using the fractal coefficient of static friction to replace the Coulomb's law. The entire deflection range is considered under quasi-static loading condition. The model of disc spring is developed to predict the load-deflection and hysteresis characteristics while contacting with different fractal surfaces. The primary object of this study is to survey the variable static friction coefficient and its effect on the disc spring. Different fractal dimension, constant static friction coefficient and free height of disc spring are considered, and the relative error of the two methods are calculated. The investigation has revealed that the effect of fractal static friction coefficient on the load-deflection and hysteresis characteristics of disc spring is concentrated in the small deflection stage. And the method is universal for disc springs of different dimension on the same surface.
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