摘要
为了能够预测粗糙结合面法向接触的能量耗散和阻尼的变化规律,在Hertz和Abbott-Firestone经典接触模型的基础上,提出了一种加载-卸载混合弹塑性接触模型。首先,研究单个微凸体在完全弹性和塑性接触状态下的受力特性,推导出混合弹塑性状态下接触面积和力的数学表达式,进而研究能量变化规律和接触阻尼特性。然后,通过文献中的实验数据,并且和完全弹性、塑性状态下的接触模型进行对比,验证了该模型的有效性。在此基础上,分析能量耗散和法向接触阻尼与法向变形量、硬度以及硬度指数的关系。结果表明,结合面能量耗散随着法向变形量的增加而变大,而法向接触阻尼随之减小;在法向变形量一定时,接触阻尼随着材料硬度的增加而变大,而硬度指数的影响很小。
Based on the Hertz and Abbott-Firestone contact models, a mixed elastic-plastic model for two rough surfaces subjected to loading and unloading was developed to predict their energy dissipation and normal contact damping. The math models of contact area and force in the mixed elastic-plastic contact mode were derived using the theory of single asperity deformed elastically and plastically, and then the energy variation and contact damping characteristics were further investigated. Subsequently, the proposed model was validated through experimental results reported in the literature, and compared with the purely elastic and purely plastic contact models. On this basis, the energy dissipation and normal contact damping were studied under the conditions of different normal displacement, hardness of material, and hardness exponent. The results reveal that the energy dissipation increases with the increase of normal displacement, but the normal contact damping decreases. The normal contact damping increases as a result of the increase of hardness of material, and it changes slightly along with the change of hardness exponent at given normal displacement. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.
出处
《振动与冲击》
EI
CSCD
北大核心
2017年第2期129-133,共5页
Journal of Vibration and Shock
基金
国家自然科学基金资助项目(51175530)
关键词
粗糙结合面
混合弹塑性
能量耗散
法向接触阻尼
Contacts (fluid mechanics)
Elastoplasticity
End effectors
Energy dissipation
Hardness
Unloading
