Fatigue Stress Concentration - Grooved Rod Factor of Safety for Infinite Life - Example 1
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- เผยแพร่เมื่อ 8 ก.ย. 2024
- Fatigue Strength - Endurance Limit
Static Stress Concentration Factor for a Grooved Round Bar in Bending
Notch Sensitivity Factor
Factor of Safety for Infinity Life
Alternating Stress
Marin Factors
Main Video: Fatigue Stress Concentrations in Just Over 10 Minutes
• Fatigue STRESS CONCENT...
Example 2: • Fatigue Stress Concent...
Example 3: • Fatigue Stress Concent...
Marin Factors for Endurance Limits in Just Over 10 Minutes
• Marin Factors for ENDU...
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CORRECTION: A 2:23 the final answer for σ_ar should be 51.35 ksi instead of 32.34 (I divided by 1.8^4 instead of 1.8^3)
Why and how did we find the equivalent radius? Why de=(0.37).d ?
loved your videos.Keep making content and views will follow.
Thanks!
Could you please recheck the calculation of "Sigma-r"?
Added it as a correction comment. Thanks for catching this!
@@LessBoringLectures Thanks for the correction note. So the nf is less than 1, am I right?
Yup. Means it would fail.
Hi, where can i get the notes of these lecture?
Which text do you use as the reference Shigley's Machine design? So if yes, could you , please, check the coefficient "a" and the exponent "b" for Machined surface in surface factor "Ka"? Table 6-2: a=2.7 & b=- 0.265
Thanks.
Unfortunately, the values change depending of the version of the book. The value 2.7 is in fact the new value for a (it used to be 2.0 in the 9th or 10th edition). HOWEVER, remember that the purpose of textbooks is to explain a concept, not provide accurate material properties or parameters that you should be using in real applications. Hope this helps!
@@LessBoringLectures Sir, I already checked the editions 9th, 10th and even 6th for the values of "a" and "b", were close to 2.7 for "a" and exactly -0.265 for "b". Although I agree with your logic but in world of engineering, numerical values mater.
Thanks a lot for your responses and videos.
@@mohammadesmaeilzadeh8240 www.chegg.com/homework-help/questions-and-answers/please-submit-36334-even-think-answer-wrong-professor-confirmed-ot-glitch-submit-answer-di-q47082190
Might have the wrong version number, but it's definitely in a version of Shigley's, as you can see in the link above.
The numerical values DO matter, I agree, and that's why you never trust values in a textbook. That's why there's engineering handbooks and other online resources.
Thanks for checking though! It's good to have the most recent info.
Hi. In 1:47 where did 32M come from?
th-cam.com/video/DuPtVa8mejc/w-d-xo.html It's always the same for all solid rods subjected to bending. Hope it helps.