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首页> 外文会议>Leeds-Lyon Symposium on Tribology; 20000905-08; Lyon(FR) >Thermomechanical finite element analysis to describe the engagement and wear of electromagnetic clutches
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Thermomechanical finite element analysis to describe the engagement and wear of electromagnetic clutches

机译：用热机械有限元分析来描述电磁离合器的接合和磨损

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摘要

The engagement of electromagnetic clutches is modeled as transient sliding of smooth and concentric mild steel rings. The coupled thermomechanical problem is solved by finite element analysis. Calculations of transient stresses and temperatures are presented. Wear predictions, based on a local Archard model, are compared with measurements. The principal finding of the work is that smooth surface coupled thermomechanical finite element analysis fails to accurately capture thermal distortions or lack thereof as observed in tests. The asperity contacts reach high temperatures, hundreds of degrees Celsius, while the surrounding material remains much cooler and exhibits low temperature gradients. Thermal distortions are suppressed and the system operates successfully under far more severe conditions than expected. Isothermal analysis better captures the macroscopic pressure distributions in these devices than does the thermomechanical model. We also suggest a modification to local Archard model, which relates local normal pressure to wear depth. Inclusion of the macroscopic (von Mises) stress distributions, which are different on two the sliding surfaces, better captures the shapes of the observed wear tracks. Accurate modeling of such contacts will ultimately require the simultaneous analysis of microasperity contacts and the full component geometries.
机译：电磁离合器的接合被建模为光滑且同心的低碳钢环的瞬时滑动。热力学耦合问题通过有限元分析解决。给出了瞬态应力和温度的计算。将基于本地Archard模型的磨损预测与测量结果进行比较。这项工作的主要发现是，光滑表面耦合热机械有限元分析无法准确地捕获热变形或在测试中观察不到的热变形。粗糙接触达到数百摄氏度的高温，而周围的材料仍然凉爽得多，并呈现出较低的温度梯度。可以抑制热变形，并且系统可以在比预期严重得多的恶劣条件下成功运行。与热力学模型相比，等温分析可以更好地捕获这些设备中的宏观压力分布。我们还建议对局部Archard模型进行修改，将局部法向压力与磨损深度相关联。包括两个滑动表面上不同的宏观（冯米塞斯）应力分布，可以更好地捕获观察到的磨损轨迹的形状。此类接触的准确建模最终将需要同时分析微细接触和整个组件的几何形状。

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