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所在平台: Udemy |
课程主页: https://www.udemy.com/course/surface-roughness-texture-and-tribology-full-course/
课程评论：没有评论
Coursera 课程：“表面粗糙度、纹理和摩擦学” 是一门深入探讨表面特性对组件功能、外观和磨损影响的综合课程。该课程旨在帮助学员理解复杂的表面纹理分析，并掌握其如何与磨损、配合和摩擦等功能相关联。 课程涵盖以下十大模块： 1. **表面纹理与测量入门**：讲解表面纹理的重要性，介绍各种表面粗糙度和纹理测量仪器，以及测量仪器之间的相关性。此模块为免费内容，适合初学者。 2. **表面纹理测量的滤波**：深入探讨空间波长/频率如何构成表面纹理，区分粗糙度、波纹度和形貌，以及如何设置截止波长，并依据 ISO 1302 和 ASME 14.36 标准指定纹理。此模块是后续课程的基础。 3. **表面纹理参数**：介绍二维和三维表面纹理参数，包括幅度（高度）参数、空间参数、混合参数以及功能参数，并指导如何选择最适合不同应用和功能的参数。 4. **磨损**：分析磨损机制，探讨磨损如何逐步改变表面及其功能，介绍用于量化磨损的表面纹理参数，以及磨损与材料特性之间的关系。 5. **干摩擦**：讲解非润滑系统中的摩擦机制，介绍如何测量摩擦及量化摩擦的参数，以及表面纹理与摩擦的关系，“实际接触面积”的概念，以及塑性和弹性变形。 6. **润滑摩擦**：阐述润滑摩擦的机制及其量化方法，介绍润滑剂及其属性（如粘度），分析表面纹理在润滑系统中的作用，并讲解流体动力润滑、弹性流体动力润滑、混合润滑和边界润滑这几种工况，以及在不同工况下的摩擦差异。 7. **滚动摩擦**：解释干滚动摩擦的机制，定义并区分牵引滚动、牵引摩擦和滚动摩擦，阐述滚动摩擦远低于滑动摩擦的原因，以及表面纹理、润滑与滚动摩擦的关系。 8. **表面能、润湿和表面粗糙度**：探讨表面能与表面润湿的关系，分析决定液体在表面反应的动力学过程，讲解表面纹理在决定液体是否润湿表面的作用，以及亲水性和疏水性表面，并介绍实现期望润湿性的表面改性方法。 9. **密封、密封技术与表面光洁度**：介绍各种密封系统和材料，分析表面粗糙度和波纹度的影响，讲解用于密封应用的表面纹理参数，“虚拟垫片”（形态滤波）的概念，以及“承载比”（或材料比）曲线在密封中的应用。 10. **涂层：从基材到面漆的表面粗糙度**：分析基材和各层涂层系统的表面纹理如何影响最终外观，介绍测量漆外观的仪器，以及控制基材和涂层层中空间波长频带的规范。 该课程特别适合在制造、质量或设计工程领域工作，希望了解表面纹理如何影响性能、解决实际工作中遇到的表面纹理问题，或者对相关领域感兴趣的学生。部分模块也可在 Udemy 上单独购买。
How do you design an engine that can go 100,000 miles between oil changes? How do you make soles for sneakers that help an athlete to stop fast, change, direction, and accelerate? Can we apply the "stickiness" of a gecko's feet to create adhesives that can be used around the house?Surface finish affects how components function, look, and wear, in applications from engines to footwear to hip joints. There's a common perception in industry that surface texture is a number that you read from a gauge-some target value to be achieved. But the reality is much more interesting and complex."It was not until I found your videos that so many unanswered questions were answered. The videos you created that teach surface texture and tribology have been a tremendous help!" - Michael Bower, Analytical ChemistDr. Donald Cohen, one of the country's foremost experts in surface roughness, has been leading classes in surface roughness, friction, and tribology for over twenty years. Dr. Cohen's classes focus on surface texture analysis and how surface texture relates to functions such as wear, fit, and friction. The training is designed for scientists, engineers, technicians and students working in the fields of automotive, medical devices, aerospace, materials, polymers, and others.The ten modules of this class focus on the following topics (select modules are also available individually on udemy):1. Introduction to surface texture and measurement • Why is surface texture important? • Instruments for measuring surface roughness and texture • Correlation between measurement instruments This module is available for free, as an introduction to the class and to surface texture in general.2. Filtering of surface texture measurements • How spatial wavelengths/frequencies make up surface texture • Roughness vs waviness vs form • Setting cutoff wavelengths • Specifying texture per the ISO 1302 and ASME 14.36 standards Much of the following course material builds on this module, so we recommend it as a starting point.3. Surface texture parameters • Introduction to common 2D and 3D surface texture parameters • Amplitude (height) parameters • Spatial parameters • Hybrid parameters • Functional parameters • The best parameters for various applications and functions.4. Wear • Wear mechanisms and how they progressively modify a surface and alter its functionality • Surface texture parameters for quantifying wear • The relationships between wear and material properties.5. Dry Friction • The mechanisms of friction in non-lubricated systems • Measuring friction and parameters for quantifying friction • How surface texture relates to friction • The "area of real contact" • Plastic and elastic deformation.6. Lubricated Friction • The mechanisms of lubricated friction and how it is quantified • Lubricants and lubricant properties (viscosity) • The effects of surface texture in lubricated systems • The hydrodynamic, elastohydrodynamic, mixed and boundary regimes • How friction differs in each of these regime.7. Rolling friction • The mechanisms of dry, rolling friction • Definitions and difference between tractive rolling, tractive friction, and rolling friction • The reasons why rolling friction is so much lower than sliding friction • The relationship between surface texture, lubrication, and rolling friction.8. Surface Energy, Wetting and Surface Roughness • The relationship between surface energy and surface wetting • The dynamics that determine how a liquid will react on a surface • The role of surface texture on whether a liquid will wet a surface • Hydrophilic and hydrophobic surfaces • Surface modifications to achieve a desired wettability.9. Seals, Sealing, and Surface Finish • Types of sealing systems and materials • Impact of surface roughness and waviness • Surface texture parameters for sealing applications • Virtual gaskets (aka "morphological filters") • The Bearing Ratio (or Material Ratio) curve and its application to seals.10. Coatings: Surface Roughness from Substrate to Topcoat • How the surface texture of the substrate and each level of a coating system affects final appearance • Instruments for measuring paint appearance • Specifications for controlling spatial wavelength bands on substrates and coating layers.Select modules are also available independently on udemy. This class may be for you if you: • work in manufacturing, quality, or design engineering • want to learn how surface texture affects performance • need to solve problems related to surface texture in your work or research • are a student exploring any of these areas.
