9. Seals, Sealing, & Surface Finish
What you'll learn
- Types of sealing systems
- Effect of waviness on seals
- Static Seals, O- Ring Seals, Lip Seals, Engine Seals
- Sealing Materials
- No prerequisites. This module is part of the Surface Texture and Tribology Short Course, so viewing earlier modules is recommended.
Seals are simple or complex systems that keep a fluid or gas separated from another, or that maintain a fluid or gas at a different pressure than its surroundings. Surface texture plays a critical role in how well a seal will function, both when it leaves the factory and after years of service.
In this module we discuss various types of sealing systems and show how surface texture impacts their function. We show how waviness (as opposed to surface roughness) impacts sealing, and we review surface texture parameters that can be used to quantify both roughness and waviness in sealing applications. We introduce morphological filtering, a technique for analyzing how well a gasket material will conform to a mating surface. We also revisit the Bearing Ratio (or Material Ratio) curve, which was introduced earlier in this course, and show how it can be applied in the case of engine piston seals. Finally, we review a number of sealing materials and discuss their applications.
This is Module 9 of the Surface Texture and Tribology Short Course. The full course is available on udemy, or you can select the individual course modules of interest to you. Enter "surface roughness texture tribology" in the udemy search bar to browse the full course and modules.
Who this course is for:
- Scientists, engineers, technicians and students in the fields of automotive, medical device, aerospace, materials, polymers, and others
In 1994, Dr. Cohen established Michigan Metrology to help engineers and scientists solve problems related to “Squeaks, leaks, friction, wear, appearance, adhesion and other issues,” using 3D Surface MicroTexture Measurement and Analysis.
Dr. Cohen is a past Chairman of the STLE-Detroit section and has been active with the ASME B46.1 committee on surface texture since 1988, having served as Chair from 2005-2011. Dr. Cohen is also a Subject Matter Expert for the ISO surface metrology activities.
Dr. Cohen has an undergraduate degree in Physics from the University of Michigan, Dearborn, and graduate degrees in Physics and Optical Sciences from the University of Arizona. Early in his career, Dr. Cohen worked with IBM on optical disk drive development. He later joined WYKO Corporation as Product Manger and later became Vice President, leading the development of 3D surface texture metrology instrumentation.
Dr. Cohen has developed this class over the past 20 years having presented the material at numerous client locations as part of his training and consulting activities. Typically once a year the class is offered to a general audience in the Livonia, MI area.