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Thermal contact conductance between balls and bearing rings
International Communications in Heat and Mass Transfer ( IF 7 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.icheatmasstransfer.2020.104780
Jialan Liu , Chi Ma , Shilong Wang

Abstract The thermal contact conductance (TCC) between balls and bearing rings is predicted by proposing the TCC model between the curved and spherical surfaces. The Weierstrass-Mandelbrot function is applied to characterize the microscopic topography of surfaces. The fractal contact model is constructed by considering the elastic, elastic-plastic, and plastic deformations of microprotrusions, and then an effective contact coefficient is built to modify the fractal contact parameters. Finally, the TCC modeling method is proposed by considering the elastic and plastic TCCs of different contacting microprotrusions with different sizes. The experiments of TCCs were conducted under different conditions to verify the validity of the proposed model. The results show that the predicted TCCs fit well with measured values and that the predictive accuracy can be improved greatly by considering the effective contact coefficient. Then the effect of critical factors on TCCs is discussed, and the TCC increases with the external load, and increases with the fractal dimension D and decreases with the scaling constant G. The TCC of the dynamic lubricated ball bearing is much greater than that of the static lubricated ball bearing and the TCC of the static lubricated ball bearing is much greater than that of the static non-lubricated ball bearing.

中文翻译:

球和轴承套圈之间的热接触传导

摘要 通过提出曲面和球面之间的 TCC 模型,预测了球和轴承套圈之间的热接触传导 (TCC)。Weierstrass-Mandelbrot 函数用于表征表面的微观形貌。考虑微凸起的弹性、弹塑性和塑性变形,构建分形接触模型,然后建立有效接触系数来修正分形接触参数。最后,通过考虑不同尺寸的不同接触微凸起的弹性和塑性TCC,提出了TCC建模方法。在不同条件下进行了 TCC 的实验,以验证所提出模型的有效性。结果表明,预测的TCCs与实测值拟合良好,考虑有效接触系数可以大大提高预测精度。然后讨论了临界因素对 TCC 的影响,TCC 随着外载荷的增加而增加,随着分形维数 D 的增加而增加,随着标度常数 G 的增加而减小。动态润滑球轴承的 TCC 远大于动态润滑球轴承的 TCC。静润滑球轴承,静润滑球轴承的 TCC 远大于静力无润滑球轴承。
更新日期:2020-10-01
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