Gear PITTING - Surface Contact Stress Fatigue Failure in Just Over 10 Minutes!

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Surface Compressive Stress - Surface Stress at the Teeth,
Surface Endurance Strength,
Elastic Coefficient,
Material Hardness,
Factor of Safety for Surface Fatigue Failure.
0:00 Surface Stresses
0:31 Hertz Contact Theory
3:35 Radius of Curvature of Teeth
4:46 Contact Stress Equation
5:56 Infinite Life? Hardness
6:49 Factor of Safety
7:21 Pitting Example
Previous Video: Lewis Bending Stress at the Teeth of a Gear in Just Over 12 Minutes
• LEWIS BENDING STRESS a...
Example 1: • Pitting - Fatigue Cont...
Example 2: • Pitting - Fatigue Cont...
Next Video: Bearings Basics and Bearing Life for Mechanical Design in 10 Minutes
• BEARINGS BASICS and Be...
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Пікірлер: 8

@abidmorshed5980 2 жыл бұрын

this channel needs more recognition.

@AlessandroEren 3 жыл бұрын

you are a boss waiting for the Almen Coefficient

@thomas-nk7kx Жыл бұрын

nice video! How do you create the drawings? I would love to use this method for my Thesis presentation

@diegomascarenhas1456 2 жыл бұрын

How can I do for a crossed helical rack?

@BlocksPlayTV 3 жыл бұрын

I may sound stupid but is a gear from delrin(dupon) worse or better than a gear made from 4140 alloy steel which is hardened by nitrogen? Regarding longevity?

@BeavisGoFIREFIREFIRE 3 жыл бұрын

Depends on application. The Delrin one will be easier (and cheaper) to manufacture (injection molding) but won't be able to handle larger torques or higher speeds, and will be weaker in bending and surface strengths. Given the same load the steel gear will far outlast the plastic one, the surface hardness and bending strengths are a magnitude larger.

@davidkoper6146 3 жыл бұрын

Where did you pull Surface Endurance Strength from? If you could provide a source that would be great.

@LessBoringLectures 3 жыл бұрын

"A surface failure occurs when the significant contact stress equals or exceeds the surface endurance strength." "We can define a surface endurance strength SC which may also be called contact strength, the contact fatigue strength, or the Hertzian endurance strength. The strength is the contacting pressure which, after a specified number of cycles, will cause failure of the surface. Such failures are often called wear because they occur over a very long time." Shigley's Mechanical Engineering Design. Estimate as functions of the hardness of the material are pretty common.