Shaft Design for INFINITE LIFE and Fatigue Failure in Just Over 10 Minutes!

DE-Goodman, DE-Morrow, DE-Gerber, DE-ASME, etc.
Mean and Alternating Stresses,
Fatigue Failure,
Infinite Life,
Shaft Design Equations

0:00 Common Shaft Stresses
0:45 Torsion and Bending
2:15 Mean and Alternating Stresses
2:42 Principal Stresses
3:24 Von Mises Stress
3:52 Fatigue Failure Equations
4:57 Shaft Design Example
6:30 Stress Calculations
7:00 Capital A and B Factors

Previous Video:
Fatigue Failure Criteria in Just Over 10 Minutes

Next Video:
Power Screws - Torque to Force Relationships in Just Over 10 Minutes

Negligible Shear Stresses: Example Exercise in:
Castigliano's Theorem in Under 10 Minutes

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Other "Mechanical Engineering Design 1" Links:

[MathInsightCalc]

4 years as an engineering student suddenly flashed before my eyes

[rybread]

Dude, this is insanely helpful for my final project! Thanks man!

[andrewmaksimovich]

Didn't know there were such high quality videos on ME topics like this, soooo helpful as a student

[bentuinstra]

Just discovered this channel. Absolutely insane!!

[riccardotonin]

This video said what my mech Eng teacher did not teached in 6 months of course. Thanks a lot :)

[sam]

The best-ways to follow this learning from this video is not focusing on the formulas and calculations but listen the lectures most important facts, core information and concepts are stated even if it is fast explanations.

[LessBoringLectures]

Correction: the fillet radius should be 5/16", not 3/16" for the example at 5:05. Thanks to John Finan for pointing this out.

[architectman]

Thank you so much! A great refresher!!!!

[daehyunpark]

Thanks for your excellent way of delivering your lecture with nice illustration, hand writing and concise concept! I am a gear design engineer, and I would like to watch many lectures here to refresh my memory from university years. By the way, can you share with me how you create the electronic lectures? (device, software and on). I used my own note with ipad pro, but my hand writings in that device is not as expected, but when I look at yours, the hand writings are so natural!. It would be appreciate how you create the notes!

[abdelkaderahmed]

God bless you, you saved me a lo tof time

[Sssmartking]

I think there is a tiny mistake, r is not 3/16, it's 5/16
you can see this in minute 9:20
5/16=0.3125

thanks a lot for this video
its very rich and useful

[MrDemonhell]

At 7:40, the alternating shear should equal to transverse shear stress due to forces acting on gear. This is because the shaft is rotating hence causes the transverse shear stress to alternate.

[alexandria]

Damn incredible



























good job

[majedrichardsenbol]

Nice summary and explanation, but I have to ask how can I determine the stress concentration factors when designing for a new shaft, when I don't have any dimensions yet, like the fillet radius and the diameter of the shaft. How can I know kb ( size factor ), (r/d, D/d) to find Kt, Kts, Kf, Kfs. Thank you

[Ramy]

thanks for your effort, but i have a question ; when designing a shaft with gears you know torque changes at the same point of gear, can i take this as a torque fluctuation to get the Ta & Tm ?? or consider always torque is constant ???
also when can i consider Mm for a rotating shaft is not equal to zero???

[lexluthor]

Can this information be used to design vertically suspended shafts?

[bbb-thvu]

you really dedicate yourself into your videos, i can see that and i am thankfull for that. But you are reading? or you sound like you are reading. Tonning in your voice made me sleepy, your voice is nice no problem about that. Just tonning. i believe if you adjust this, it would be beter. thank you

[kattyhoho]

How can I apply this to calculate shaft for shredder?

[rafaymalik]

Can we also use the same formula to determine "n" when Sut and Sy are given in MPa? (We would convert them to Pa and then substitute in the formula for n, correct?)

[andreasdavid]

if i have a solid shaftwithout notches the value for kf can be negleted right?