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!
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 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
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
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
I would love it if you kept making amazing videos. You do a great job breaking down the fundamentals without overloading in the theories behind them. The annotations...pristine!
thank you for making the nights before exams this much easier. the graphics, animation, voiceover and the scripts are very well thought and well put down. please don't stop producing such useful video lectures, the planet needs good people like you. 🙏
Completing this video marked my reaching the end of your Strength of Materials playlist. What an intense but great wrapping up of all core concepts! I feel so much more confident learning this. I already work as a machanical engineer and this is seriously better than whatever I was taught (but did not understand) back in college.
these is what i needed for so long, representaive animation, simple and easly understanding for those who are not english native speakerr, keep it up broo.. attending college cant make me understand about material engineering :') , may u blessed..
I am super impressed by your way of summarizing the S-N curve. I was just looking for a video to refresh my concepts and this is perfect. Keep up the good work! Subscribed and expecting even more from you guys now! :D
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.
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?
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!
please , do not stop blowing our minds with this amazing videos, keep it up and you can really do much better and download more videos on different topics in engineering, man it’d be amazing for all of us in the industry
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!
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
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 RU-vid 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.
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!
Fantastic Video. The concepts are explained in detail and in a clear manner. Graphics are outstanding enabling easy visualization. A wide array of topic attributes are introduced to aid in further exploration. Love this, keep up the good work.
This playlist is great!!! Whenever i feel like revising my basics i just go though your playlists. Can you make some vids on manufacturing process and theory of machines...would be of great help
Endurance limit is king, and everything I’ve designed, where possible, has been within this limit. For steel, I try to design to Tensile/3 and apply a good surface finish, and touch wood I’ve not had a failure in over 20 years.
@@nyquist_control not so much a FOS with fatigue, but typically for steel, fatigue really only becomes an issue at Tensile/2, although there are mitigating circumstances!! That’s why working to Tensile/3 means your design is typically free from fatigue failure.
I'm studying geosciences in my masters. I still can't believe how much of other disciplines we have to know (like engineering, physics and chemistry. It's insane.
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.
