机械密封端面黏着磨损分形模型

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According to archard wear theory, a adhesive wear fractal model of the end face of mechanical seals was established by introducing the fractal wear coefficient and solving the volume of plastic and elastic-plastic deformation asperities, on the basis of contact fractal model of the end face of mechanical seals. The relationship among the wear rate, the profile fractal parameter of the end face of the soft ring, the real contact area, the material performance parameters and the working parameters of mechanical seals were obtained. The wear rate of the end face of soft ring of B104a -70 mechanical seal was calculated and analyzed. The results indicate that the wear rate of the end face increases with increase in the face pressure, the rotating speed and the charac- teristic length scale of the end face, and it decreases rapidly at first and then increases gradually with increase in the fractal di- mension. There exists an optimum fractal dimension which make wear rate minimum.在机械密封端面接触分形模型基础上，依据Archard磨损理论，通过引入分形磨损系数及求解塑性和弹塑性变形微凸体的体积，建立了机械密封端面黏着磨损分形模型。得到了机械密封软质环端面磨损率与端面轮廓分形参数、真实接触面积、材料性能参数以及工作参数之间的关系式。对B104a-70型机械密封软质环端面的磨损率进行了计算和分析。结果表明，端面磨损率随着端面比压、转速及端面特征尺度系数的增大而增大；随着端面分形维数的增大先迅速减小后逐渐增大，即存在一个使磨损率最小的最优分形维数。