横向各向同性材料点接触冲击弹流润滑分析

IF 2.2 3区 工程技术 Q2 ENGINEERING, MECHANICAL
Linh Thi Phuong Nguyen, Wang-Long Li
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引用次数: 0

摘要

在传统的弹流润滑(EHL)领域中,通常使用各向同性材料的弹性半空间模型来确定表面弹性变形。然而,当应用于涉及固有各向异性材料(如横向各向同性(TI)材料)的点接触问题时,该理论可能是低效的。因此,本研究提出了一种采用直接求解数值方法求解冲击载荷下刚性球与TI基板之间EHL点接触问题的方法,其中TI材料的力学性能以刚度矩阵的形式表示。为了比较,TI材料也使用基于材料等效模量性质的特纳近似方法近似为各向同性材料。结果表明,直接求解法在解释TI基板的力学性能方面优于Turner近似法。此外,研究表明,刚性球的初始速度和TI材料的刚度(即横向弹性模量、纵向弹性模量和剪切模量)对球的载荷、冲击速度和加速度有显著影响;润滑油的中心压力和油膜厚度;TI基板在冲击过程中的变形和von Mises应力。总体而言,结果表明所提出的EHL模型为解决涉及TI材料的冲击EHL问题提供了一个有用的工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impact elastohydrodynamic lubrication analysis of transversely isotropic materials in point contact
Abstract In the traditional elastohydrodynamic lubrication (EHL) field, surface elastic deformation is usually determined using an elastic half-space model for isotropic materials. However, this theory may be inefficient when applied to point contact problems involving inherently anisotropic materials, such as transversely isotropic (TI) materials. Accordingly, the present study proposes a method for solving the EHL point contact problem between a rigid ball and a TI substrate under impact loading using a direct-solving numerical method, in which the mechanical properties of the TI material are expressed in the form of a stiffness matrix. For comparison purposes, the TI material is also approximated as an isotropic material using Turner’s approximation method based on the equivalent modulus property of the material. It is found that the direct-solving method outperforms Turner’s approximation in interpreting the mechanical properties of the TI substrate. In addition, it is shown that the initial velocity of the rigid ball and the stiffness of the TI material (i.e., the transverse elastic modulus, longitudinal modulus, and shear modulus) have significant effects on the load, impact velocity, and acceleration of the ball; central pressure and film thickness of the lubricant; and deformation and von Mises stress of the TI substrate, during the impact process. Overall, the results show that the proposed EHL model provides a useful tool for solving impact-EHL problems involving TI materials.
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来源期刊
Journal of Tribology-transactions of The Asme
Journal of Tribology-transactions of The Asme 工程技术-工程:机械
CiteScore
4.20
自引率
12.00%
发文量
117
审稿时长
4.1 months
期刊介绍: The Journal of Tribology publishes over 100 outstanding technical articles of permanent interest to the tribology community annually and attracts articles by tribologists from around the world. The journal features a mix of experimental, numerical, and theoretical articles dealing with all aspects of the field. In addition to being of interest to engineers and other scientists doing research in the field, the Journal is also of great importance to engineers who design or use mechanical components such as bearings, gears, seals, magnetic recording heads and disks, or prosthetic joints, or who are involved with manufacturing processes. Scope: Friction and wear; Fluid film lubrication; Elastohydrodynamic lubrication; Surface properties and characterization; Contact mechanics; Magnetic recordings; Tribological systems; Seals; Bearing design and technology; Gears; Metalworking; Lubricants; Artificial joints
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