粗糙表面的新型三维塑性体流体动力润滑模型

IF 6.3 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Friction Pub Date : 2024-04-02 DOI:10.1007/s40544-023-0793-z
Shengyu You, Jinyuan Tang, Qiang Wang
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引用次数: 0

摘要

粗糙表面的塑性流体动力润滑(R-PEHL)是界面流固耦合分析的前沿研究领域。现有的 R-PEHL 模型是在半无限空间光滑表面上通过 Love 方程计算粗糙表面的弹塑性变形,与实际表面存在偏差。因此,研究粗糙表面弹塑性变形的精确解及其对 R-PEHL 模型求解结果的影响是一项创新工作。本文通过整合 EHL 数值方法和有限元方法,提出了一种新的三维(3D)粗糙表面塑性流体动力润滑(PEHL)接触计算模型。新模型消除了接触计算中半无限空间假设带来的原始误差,具有广泛的适用性和较高的精度。在给定的粗糙表面和工作条件下,研究表明(1) 新模型计算的油膜压力比半无限空间的光滑表面低 200-800 MPa;(2) 新模型的米塞斯应力比光滑表面的米塞斯应力高 2.5%-26.6%;(3)与半无限空间假设相比,新模型粗糙表面塑性变形增加了 71%-173%,半无限空间假设下可能出现局部塑性变形奇点;(4)新模型粗糙表面第一次接触循环引起的塑性变形占总塑性变形的 66.7%-92.9%,半无限空间塑性变形占 50%-83.3%。该研究解决了现有 R-PEHL 模型中光滑表面假设与粗糙表面之间的矛盾,为 R-PEHL 模型的精确求解奠定了坚实的逻辑基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A new 3D plastoelastohydrodynamic lubrication model for rough surfaces

Plastoelastohydrodynamic lubrication of rough surfaces (R-PEHL) is a cutting-edge area of research in interface fluid-structure coupling analysis. The existing R-PEHL model calculates the elastic-plastic deformation of rough surface by the Love equation in a semi-infinite space smooth surface, which deviates from the actual surface. Therefore, it is an innovative work to study the exact solution of elastic-plastic deformation of rough surface and its influence on the solution results of R-PEHL model. In this paper, a new contact calculation model of plastoelastohydrodynamic lubrication (PEHL) with three-dimensional (3D) rough surface is proposed by integrating numerical method of EHL and finite element method. The new model eliminates an original error introduced by the assumption of semi-infinite space in contact calculation, providing wide applicability and high accuracy. Under the given rough surfaces and working conditions, the study reveals that: (1) the oil film pressure calculated by the new model is lower than that of the smooth surface in semi-infinite space by 200–800 MPa; (2) the Mises stress of the new model is 2.5%–26.6% higher than that of the smooth surface in semi-infinite space; (3) compared with the semi-infinite space assumption, the rough surface plastic deformation of the new model is increased by 71%–173%, and the local plastic deformation singularity may appear under the semi-infinite space assumption; (4) the plastic deformation caused by the first contact cycle on the rough surface of the new model accounts for 66.7%–92.9% of the total plastic deformation, and the plastic deformation of the semi-infinite space accounts for 50%–83.3%. This study resolves the contradiction between the smooth surface assumption and the rough surface in the existing R-PEHL model, establishing a solid logic foundation for the accurate solution of R-PEHL model.

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来源期刊
Friction
Friction Engineering-Mechanical Engineering
CiteScore
12.90
自引率
13.20%
发文量
324
审稿时长
13 weeks
期刊介绍: Friction is a peer-reviewed international journal for the publication of theoretical and experimental research works related to the friction, lubrication and wear. Original, high quality research papers and review articles on all aspects of tribology are welcome, including, but are not limited to, a variety of topics, such as: Friction: Origin of friction, Friction theories, New phenomena of friction, Nano-friction, Ultra-low friction, Molecular friction, Ultra-high friction, Friction at high speed, Friction at high temperature or low temperature, Friction at solid/liquid interfaces, Bio-friction, Adhesion, etc. Lubrication: Superlubricity, Green lubricants, Nano-lubrication, Boundary lubrication, Thin film lubrication, Elastohydrodynamic lubrication, Mixed lubrication, New lubricants, New additives, Gas lubrication, Solid lubrication, etc. Wear: Wear materials, Wear mechanism, Wear models, Wear in severe conditions, Wear measurement, Wear monitoring, etc. Surface Engineering: Surface texturing, Molecular films, Surface coatings, Surface modification, Bionic surfaces, etc. Basic Sciences: Tribology system, Principles of tribology, Thermodynamics of tribo-systems, Micro-fluidics, Thermal stability of tribo-systems, etc. Friction is an open access journal. It is published quarterly by Tsinghua University Press and Springer, and sponsored by the State Key Laboratory of Tribology (TsinghuaUniversity) and the Tribology Institute of Chinese Mechanical Engineering Society.
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