Measurement and modeling of normal contact stiffness and contact damping at the meso scale
Measurement and modeling of normal contact stiffness and contact damping at the meso scale
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DOI：
10.1115/1.1857920
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发表时间：
2005-02-01
影响因子：
1.7
通讯作者：
Polycarpou, AA
中科院分区：
文献类型：
--
作者：
Shi, X;Polycarpou, AA
接触界面的建模本质上包括粗糙度，例如接头、夹紧装置和机器人接触，在许多工程应用中非常重要。此类设备的精确建模需要了解接触参数，例如接触刚度和接触阻尼，而这些知识并不容易获得。本文开发了一种基于接触共振的实验方法，用于提取轻载条件下真实粗糙表面的接触参数。研究了在高达 1000 mN 的法向载荷下接触的赫兹球形接触和平坦粗糙表面。由于粗糙度的原因，测得的接触刚度值明显低于根据光滑接触表面预测的理论值。此外，测量值与基于赫兹接触表面和粗糙接触表面的理论值相比较。发现接触阻尼比值随着赫兹表面和平坦表面接触载荷的增加而减小。此外，与粗糙的平面相比，赫兹接触具有更大的阻尼，这也与文献相符。还研究了界面处微量润滑剂和磨损碎片的存在。研究发现，尽管只有润滑剂显着增加，但润滑剂和磨屑均显着降低了接触刚度。阻尼。
Modeling of contact interfaces that inherently include roughness such as joints, clamping devices, and robotic contacts, is very important in many engineering applications. Accurate modeling of such devices requires knowledge of contact parameters such as contact Stiffness and contact damping, which are not readily available. In this paper an experimental method based on contact resonance is developed to extract the contact parameters of realistic rough surfaces under lightly loaded conditions. Both Hertzian spherical contacts and flat rough surfaces in contact under normal loads of up to 1000 mN were studied. Due to roughness, measured contact stiffness values are significantly lower than theoretical values predicted from smooth surfaces in contact. Also, the measured values favorably compare with theoretical values based on both Hertzian and rough contact surfaces. Contact damping ratio values were found to decrease with increasing contact load for both Hertzian and flat surfaces. Furthermore, Hertzian contacts have larger damping compared to rough flat surfaces, which also agrees with the literature. The presence of minute amount of lubricant and wear debris at the interface was also investigated. It was found that both lubricant and wear debris decrease the contact stiffness significantly though only the lubricant significantly increases. the damping.