Understanding Fatigue Failure and S-N Curves
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- เผยแพร่เมื่อ 8 มิ.ย. 2024
- Fatigue failure is a failure mechanism which results from the formation and growth of cracks under repeated cyclic stress loading, leading to fracture. It can result in failure at stress levels well below the material yield or ultimate strengths.
In this video I discuss the mechanisms behind fracture, and how S-N curves can be used to predict the fatigue life of a component.
I also discuss the effect of having a tensile mean stress, and how we can use techniques like the Rainflow counting method and Miner's rule to consider complex cyclic stresses.
The Efficient Engineer is a channel aimed at mechanical and civil engineers. The mission is to simplify engineering concepts, one video at a time!
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HELLO, I have an exam in 2 and a half hours. Can you tell me why the initial fatigue results are scattered? Cant find the answer anywhere. Great video otherwise!! Thankyou!!
Hi Peter! Most of the scatter will typically arise in the crack initiation phase, where there is more variability, than in the crack growth phase. This initial phase will be sensitive to things like the surface conditions of the test piece. Of course there will also be some variability associated with the test, e.g. the equipment that is used. Hope that helps - good luck with the exam!
@@TheEfficientEngineer Ahhh yes, thank you so much for replying so quickly. Will need the luck!
peter calow How did you do in your exam? :)
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i cant believe he actually replied just in time before your exam
my professor spent tens of hours to deliver what you have delivered in less than 10 minutes
That's because the professors need to justify their jobs and therefore have to drag out lectures when in reality they can be explained in much easier terms as seen in the video.
If the professor use the video method to teach u in the first time, May you not understand the content.
if you have no idea what stress is or what stress strain chart is or what fatigue is .. what stress amplitude is .. it could take a while to get here and for you to understand it .. however going through semester and thn filling up gaps in understanding from youtube videos work really welll
This guy spends tens of hours creating this video.
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What a video! That is one of the best explanations I've ever seen in my whole engineering life! Congratulations to you all! And, please, don't stop posting subjects like that
That was basically my entire Masters level Fracture Mechanics course condensed into just over 8 minutes. Great job!
I wish there was a channel like yours explaining engineering facts when I was an Engineering student. Complicated engineering concepts are easier to understand and remember with multimedia like your channel. Thanks
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Great explanation of fatigue phenomena in all their aspects, in a simple way. Thank you ! 🙏
Very good intro to problematic. Just what I needed. Thank you!
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Well explained video. I am grateful to you to make these difficult things so easy and interesting.
I had a poorly packaged pipe shipped to me crack from either reaching tensile strength, cycle fatigue, or both because it wasn’t strapped down and it was fully constrained at one end. So while riding on the truck it freely bounced up and down, like a spring until failure. Now I’m writing the FMEA report. Calculations showed it may have reached plastic deformation elsewhere if tensile strength was reached, let alone ultimate strength. Now have to measure crack size for comparison. Thank you for the useful review!
I'm not even a mechanical engineer but my manager gave me a test report of a structural brace to review if it meets AISC seismic provisions...this video helped me so much to complete my review!
The greatest video about this I have ever watched. Thank you so much.
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This video and all your videos in general are really cool, educational and cristal clear. I wish you made a couple of lecture about LEFM and fatigue approach for multiaxial state of stress criterions or non proportional mixed loadings. Greetings and thank you!
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mannn than you soo much!!!! you really made it 100 times simpler than what my teacher was trying to explain
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awesome explanation, awesome animation! Thanks a lot!
Thank you very much. This video helped me a lot to understand what is fatigue failure. Your explanation is fantastic.
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Thank you very much for the video!! After I watched your video, I realized that most of the professors at a 4-year research university don't know how to teach!!! I cry 😢 because videos like this didn't exist when I attended college. P.S. I graduate from college back in the year 2010 by the way. Back then TH-cam was just 5 years old in my graduating years, meaning it was still relatively new, and learning engineering concepts from youtube back then weren't as common as today. There weren't that many videos that are educational and can teach me engineering either back then. All I can say is: college students nowadays are such a group of lucky fellows.
OMG this video just help me figure out the answer for my assignment question, thank you!
Great video introducing fatigue! Could mention that damage summation by Miner is only approximation as for variable loading actual loading history can make huge difference. Fun fact initial high loading (even partial yielding) for steels can improve high cycle fatigue.
Very simple illustration
Bravo.
i learnt more in this video than i did in 3 weeks worth of lectures
Very Good Work Sir.
May u always make such quality animations lectures for us.Thanks
wow, such an informative lesson!
best explantion for fatigue failure thank you very much
Such a great explanation......We need an episode on VMEA/FMEA analysis
Useful and simple presentation
Simple and details explain action.. thank you...👍😀
Wow, a video like this can clear up the whole concept that one were struggling to understand during its semester. That one would be me 😅.
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These videos are so good!! could you do one on stress concentrations??
Thanks for great videos.
Hi. Huge fan of your service. It isn't easy to eat an entire sugarcane but it can be easily consumed as a juice. As part of an engineering community, we are grateful for your work. Can you please do a video on Fracture mechanics as a follow-up to this?
perfect informations.this video helps me a lot to remember . thank you bro
Great Explanation
Thank you so much 😊
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this video explain more about fatigue , thanks for this information
Superb sir , Greetings from INDIA !
What a great video! THANK YOU
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Very Well Explained
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U deserve millions of subscribers and their support. Please upload videos on Fluid Mechanics part too.
Very easy to understand
On the stress amplitude graphs at 4:15, you should’ve plotted some of the other theories, especially since the Goodman line and Gerber Line do not guarantee infinite life, as they can fail from going past the yield point of a material, giving them finite life. This is true for most theories, but especially true for these
Thanks for the video.
INSANE FINALY SOMEONE CAN EXPLAIN SIMPLE IN 8 MINUTES
This guy deserves a billion subscribers
I love these graphics! what software is being used?
Thank you !
this is a great video
More on fatigue please!
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so clear, ty ty ty :DDD
you explain it very clear! thank you very much! just more about rainflow counting method, in matlab there is built in function that give you the cycle number, range and mean of a complex fatigue record in time domain.
Great tip, thanks! There are also Python modules out there that can do the same, e.g. pypi.org/project/rainflow/
very informative
Thanks life is easy when u have good ppl
Learn lot from this
Please keep doing these videos 😭
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Thank you
Thanks!
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Amazing