Understanding Failure Theories (Tresca, von Mises etc...)
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- Опубликовано: 1 июн 2020
- Failure theories are used to predict when a material will fail due to static loading. They do this by comparing the stress state at a point with material properties that can be easily determined from testing, like the yield or ultimate strengths of the material determined from a uniaxial test.
In this video I cover some of the main theories for ductile and for brittle materials - Rankine (maximum principal stress theory), Tresca (maximum shear stress theory), von Mises (maximum distortion energy theory) as well as the Coulomb-Mohr and Modified Mohr theories.
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I'm strucutral engineer with 20+ years of experience, and I wish I had an explanation like that when I was learning.... Took me a lot of time to fully understand, and I'm still learning.
Congrats, very good.
Appreciate it, thank you!
I came here to write the exact same thing. The explanations around the failure criteria are excellent.
(kinda) same here
Google, youtube and internet in general are making a silent revolution in the field of didatics and studing.
Those things used to be secret codes that virutally no one understood (well, not those ones here but some more advanced ones)
Internet is slowly making knowledge, even advanced ones, democratic.
I see mankind moving faster now that those information are more available and well explained
Have you ever use this once since school?
@@mrmadame28 yes, a little
I paid far too much to my university for Engineering Courses that were no where near as educational as your videos. Thank you!
Actually they provided you to understand content of this video. But when we look at it from another angle, you are right. You shouldn't have learned new things about a topic that was finished studying decades ago.
Where r u from bro
@@sharana.p5921 He is from Turkey
Soooooooo true!!!!
Paid to university doesn't mean the university has to read the book for you.
Being a teacher myself. I can only imagine the efforts you are putting in order to explain difficult stuffs so easily and artistically.
Kudos to you.
Keep doing the good work
As you said you are a teacher . Can you answer my one question ? If the pressure of the fluid varies with depth assuming the density to be constant, should the temperature also increase with depth in a fluid? I think yes. See the atmosphere above us a good example of it.
@@physicslover1950 there is no relation of variation of temperature with depth .
Think about ocean water as its top layer has high temperature than the water in depth bcoz of solar radiation .
As we goes in depth water has less exposer of solar radiation bcoz radiation can penetrate in water upto a depth .
When it comes to earth Atmosphere the atmospheric layer near earth has high temperature bcoz of reflection of radiation from earth and then greenhouse gases like water vapour , CO2 do not allow them to escape which causes increase in temperature of earth near layer atmosphere
@@physicslover1950 by the way atmosphere doesn't have uniform density... So you can't compare the almost uniform density scenario of water and highly varying density case of air
@@physicslover1950 that's a very vague question there are many factors to consider here,
By basic definition temp is measure of thermal energy which in turn is in case of solids and liquids is oscillations and in gas degree of random motion.
Even more important is the fact that these changes in density of liquids are negligible with depth almost 2-3% you are comparing two different fluids with each other. Air is way different than water.
And in the first place how did you manage to think that way? That temp would increase if pressure or density increases?? State eqn, I assume like ideal gas eqn, then its not applicable for subcooled liquids and I could even argue that Bcz we move air so much near the surface of earth the temp of air is higher, you get the point.
I'm not even talking about radiations
Whatever keep thinking, it's a good thing.
@@user-vi3pi9rf7w Thanks for the motivation actully I got the answer 2 months ago that the temperature doesn't increase down with the increase of pressure because if the temperature increased then according to boyles law volume must increase and if the volume increased the density of the liquid becomes less than that on the surface which is a vogue and non sense statement 😅.
Actually the density decreases as we go down .
Pressure =(constant)(density)( temperature )
So in this case the increase in pressure is only due to the increase in density and an increase in density is due to the dcrease in volume . Recall again the equation
PV = nRT
Or
PV= T
When pressure increased with depth the volume decreased and temperature remained constant and wise versa. In case of earth the temperature increases down due to non uniform gravitational field. But in case of a swimming pool the gravitational field is nearly uniform.
I'm a structural engineer in my early 60s. I have never seen or heard this subject explained better than this. Too often in text books, the text is written by experts who don't understand the need to explain this progressively from simple to complex - they just go for the final, complex solution straight off. And so, the subject matter starts somewhat impenetrable for many beginners....
You must be my brother from another mother: I'm an involuntarily retired aero engineer of the same vintage, with a structures background. I wish I'd had this 40-odd years ago.
im a structural engineer too, same thoughts, spectacular video, great editing, sound, graphics, music, holy crap the whole presentation I couldn't believe my eyes
They write the books intentionally incomprehensible!
@@amersabitovic203 certainly seems like it. why do you say so?
@@majermike corruption.
i wish i had a professor like you.
Actually, you have him as professor every time you watch a video of him.
I too. I definitely did not become an aerostructures engineer, but an avionics one.
Ok, your videos are perfect for visual understanding and reviewing concepts. I can't imagine how hard it must be to prepare them
I'm a junior right now, studying mechanical engineering. I'm excelling in my classes thanks to your videos! The impact you have on the next generation of engineers is imeasurable.
My professor loves to play efficient engineer videos during our lectures.
I remember when I do FEM analysis using a software, these failure theories are present at the handbook/users’ manual of the FEM software. It is very nice to see the interpretation of these theories here. You did a great job. Thank you.
I would prefer you denote the stress component in matrix than presented in plane shape/circles. According to matrix theory, any stress exerting to micro cube must be linearly transformed to the new basis, presented by the matrix. It is just my opinion at this moment.
Bo Zhao shut up dude
can u send me the user manual
@@jerin3710 what software are you using? During my school years I used Ansys, it's a decent FEA software. Find it in torrentz or google it. Usually, schools provide one, but it skips many steps.
@@andresgaviria9559 Ansys is what we use professionally. Atleast in the aerospace industry
In my 20 years experience I never heard a much clear explanation/presentation of these concepts. Great effort and very good job.
The colleges and universities need teachers like you who are ready to learn in order to teach others. I admire you.
I study structural engineering at the highest ranked (by MIT) engineering university in Europe, and you just explained this particular subject much more clearly and in 1/6 of the time that the lectures took.
this wasn't even explained to us and they want us to create an in depth report on it... oh well, we do what we have to do.. big thanks to this channel!
I can't thank you enough.
I was never really able to wrap my head around these concepts but man your videos are AWESOME!!!
Keep doing this good work. I hope to see this channel reach newer heights.
Finding this channel is probably the highlight of my whole month. Thank you very much, the impressive amount of effort put into this shows in every frame. Keep the amazing work!
Man Loved it. You're 3B1B of Engineering.
I can predict this is gonna be a great channel.
Yes exactly.
That's a great comparison
The animations are akin to those typically seen in Grant's videos. I'm betting he (or his team) uses Manim...
@@ADickIHave If you've used Manim, you'd know that's not true. Manim is SPECIFICALLY for animating math.
I think this guy uses Blender for the 3D objects and something like After Effects for the text/graph animations
Soumil Sahu your guess is definitely smarter than mine. I have manim but don’t know the boundaries of its capabilities because i’m a grade-a amateur
It's always nice to have people explain subjects on YT. But there are very few channels who will go this far to make their videos so concise & visually appealing. Well done! Subbed.
I often come back to these videos to remember what I learned in my studies. It takes a lot of work and understanding to summarise the theory so neatly. Thank you very much for this.
Congratulation! This is the most comprehensive animation and visualization about failure theory I know! It reminds me how unbelievable it was to hear that hydrostatic stresses, no matter how high, do not cause plastic deformation. Also, you did a great job with animating the theories in principal stress space!
This is absolutely incredible ! I remember this being thought in college, but it never 'clicked' in my head. All your videos have helped me understand these fundamentals in a more intuitve way. Your videos make me question and dive deep into the fascinating field of Mechanical Engineering. Thank you for your time and effort :D
This channel is by far the best one I have found online for mechanical engineers. Kudos to you, 'The Efficient Engineer' for making these topics so easy to understand. The graphics, colour and simplicity of explanation make these videos fantastic!!! Well done :D
The graphics are amazing and really helped me understand why the yield surfaces look the way they do!!
Gentlemen this was the one among the most awaited topic to be covered you. And now it feels so great, since you didn't disappoint (like always). You make me feel proud for being one among your subscribers.
I have an exam in construction mechanics tomorrow, this was truly a godsend, thanks!
Great explanation. Looks like this is going to be one of the top engineering channel on RUclips very soon. The amount of hardwork you put in this video should deserve it.
Geoscience masters student here. I REALLY appreciate the visuals and the basic explanations. Sometimes our professors just jump straight to the more advanced stuff, without even explaining where the yield surfave or failure surface come from. Or it's really not well explained and no visuals were used. This channel is gold
Excellent explanation, very clear and practical. It took me weeks of studying to barely understand these and you explained it like if it was 2+2. Congrats
Mechanical Engineer for 5 years and I have been going over finite element analysis so I wanted to review this but didn't expect how much it helped. Like others before me, I am grateful for a much better my understanding is then I had before
can you help me in finding a good platform to learn math for finite element analysisd
Thank you so much. It has been 3+ years trying to understand the concepts you have explained in your videos. But the last 16 min of your video made the 3+ years go in vain. Wow. Just amazing. Keep up the good work and please post more videos linked to thermodynamics. Thanks again.
This is brilliant! I am a third-year mechanical engineering student, and all my prof does is writing complex derivations and equations on the blackboard. I had never seen any visual representations as great as this. Really appreciate it.
I’ve taken undergraduate and graduate FEA classes and as a visual learner this is incredible. So happy that future students have resources like these instead of just black and white textbooks. You can tell me what an equation is, make me derive it, but seeing it plotted and explained makes it click as to why the equation even works.
We all should fund him to open his own university!
Be a Patreon
I agree!
The fact that you put this much effort is mindboggling. I am currently doing this course and this really helps out a lot. Thanks!!
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This page is just amazing. Complex engineering concepts explained just in layman’s terms. Appreciate your work on creating the truly fantastic visual explanations on Strength of Materials concepts.
I never had good professors teaching Strength of Materials back in school. I started watching your videos and was able to successfully and easily solve the engineering problems at work and in competitive exams
Well summarized, beautifully made, cannot but love it. Great value in mere 16-minute video. Thumbs up from a fellow engineer.
This is by far the best explanation I have ever seen on this topic, amazingly well done and deep understanding is achieved with your method
Another amazing video explaining complex concepts which are a bit tricky to wrap your head around and often just by hearted and not understood well. Keep it up. I hope you cover all these concepts and make more such videos on FEM. Loved your work!
If only this was available a day ago. I kept looking for this so much. Thank you for this video. It is just awesome and detailed and interesting
All at the same time
Very beautifully explained! I am a professor in mechanical engineering and teach my students such stuff. I think I am good. But, this is explained so clearly and particularly with help of graphical visualization that I could as well suggest students this video as a pre-class "reading assignment", so that in class I spend my time better explaining other knitty-gritty and some more examples.
Wow, this is the first time that I can say without doubt you explained these failure theories, where they came from, and the differences between them far better than I was taught in college. Thank you very much for making these videos and I really give you props for your deep understanding of so many topics
One of the best educational channels around here. Please keep it up! Awesome work.
Great job! Every teacher of Strengh of Materials and Mechanical of Solids need see this video to getting improve your explanation.
I genuinely have a sense of grief over not having these resources when I was 'studying' this all a couple of years ago in my bachelor's. Bless you, man.
This is one of the most underrated educational videos I've ever seen. Congratulations, the explaining es amazing!
This explanation was excellent! The visuals make it so much more easier to understand. The concepts that took me hours to figure out when I was taking my college course, you explained in like 15 min.
Thank you so much!!
Thanks for this visual aid, I'm gonna be taking the FE (other disciplines) this August and I know learning this theory will help me a bunch.
Very well presented, clear and understandable. Thank you! I actually for the first time understand now.
As a Structural Engineer, your channel is fast becoming the main source of my CPD. I learn way more important stuff from it than formal sources that I can report PDH for.
The concepts which take hours to digest has been precipitated nicely and explained in a matter of minutes without compromising the continuity / depth of the topic.
The animations are intuitive. Have started making notes using your video.
You channel will be a benchmark for all mechanical engineers.
Suggest you to make and upload videos on Machine Design, Material Science, Thermodynamics and Fluid Mechanics.
Hats Off to you!
You are proof that teaching is an unique skill, simply getting a PhD in engineering should not be the qualifier to teach. We need need real teachers and communicators like you at the undergraduate level not just really smart guys that got a phad but can't speak or organize thoughts.
This was one of my favorite courses, especially because we got to learn the basics of designing things.
I've been school & studying Engineering for 7 years, and now I'm just figured out the detail of Stress theory by this 16 minute video.
Thanks! That was great explanation! Also the video really help for giving visual understanding!
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My attendance is 100% ... i you r my professor....
One thing I want to tell you dude!
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, keep it up, keep posting engineering videos related to mechanical and other branches. That day is not far away when u will get 1 million subscribers for sure. This is my guarantee 👍💯
Haha thanks!
One of the best educational videos I've came across in a long time. You got yourself a new subscriber.
Only channel till date that has wonderful visuals of complex mechanics concepts. Thank you for such amazing content.
This 16 minutes of video made me understand what my university teacher couldnt in 1 week
whenever I watch your videos I just go into another world
This is such beautifully done video on failure theories,It almost made teared up. Thank you so much. Same as others here in the comments section,we cannot thank you enough.
As an instructor of continum mechanics I have never been able to find such a lucid explaination of the concept. You are doing a job par excellence. More power to you.
Hey ! First of all thanks for your educational videos, they're truly amazing!
Maybe you could make a video on Beam Theory ?
Keep it up!
Can I make a suggestion?
As a student, information like this is invaluable. But , for those wanting to look further into the topic, having references to where you got this knowledge from would be most helpful. :)
Theres a million text books that cover these topics but try shigley's ME design it's pretty good. Videos like this are great for animations and bringing concepts together but if you really want to master it you should invest in a quality text book
I am starting my Masters in Solid Mechanics / Materials for stress state dependent failure of ductile metals, and I could not be more grateful for your solid mechanics videos. Thank you!
It was one of the best tutorials I have ever seen throughout my teaching and student career of the last 12 years...Thank you for your efforts.
Yo soy mexicano y para mí es complicado leer los subtítulos y observar al mismo tiempo las imágenes y gráficos. :C Espero algún día tengas tus video con audio en versión español, créeme que mucha más gente te vería, y hasta tendrías el doble de suscriptores, espero lo tomes en cuenta. Tus videos son grandiosos!!, pero a nosotros nos cuesta el triple de tiempo entenderlos a la perfección. Saludos.
I really loved your work. What book would you recommend for learning the significance and particular case for the appliance of the theories for a beginner in the field of structural engineering
Mechanics of Materials - Ansel C. Ugural is an excellent book and has practical case studies on several applications
Aerospace engineer here. I have been struggling with structural analysis for years, and I can't believe you did such a great and visual explanation here! And your animation is dope! I'm sure your videos are going to help so many people. Keep up the good work man!
Oh my god, you're explaining so well these concepts. My compliments!!
I've just invated all my students to come see your videos.
Thanks! :)
Where was this a month ago, my professor didn't teach it anywhere near this well!
Great work. Binch watching your channel now. Came for a reminder of the stuff I learned many years ago. Stayed for high quality content. I subscribed and I am looking forward to more content.
Thank you for such an intuitive explanation. I can have the first impression of what these definition is.
Good luck and stay safe!
Awesome videos sir thank you so much for this
Can you please suggest reference book for learning mechanics of materials for mechanical engineering , i want to develop concepts like you . Thank you in advance sir 😊
Sir, can you do a video on Margin of Safety and its significance
You are really great sir... I couldn't able to imagine how the failure theory's are working. But you video made it easy for everyone... keep doing such works..
You are not just efficient, you are the BEST. This is one of those topics I struggle to teach to my students in a way that they all can comprehend and feel confident about.
The true is that the first to develop the theory of stresses and strength was Maksymilian Tytus Hubert (1904), the second Richard Edler von Mises (1913), the third was Heindrich Hencky (1924). James Clark Maxwell (1865) - main assumptions in letter. Eugenio Baltrami (1885) - concept. So, in the foto should be Huber or each one of them 😌
Me clicking on this video: "I have a degree in physics, whatever it is, I'll understand it."
Me after watching the video: "There is nothing about this I understand."
You're just being screwed by jargon. Abstract reasoning-wise, there's nothing that's demanding in structural engineering comparable to physics.
@@passerby4507 I definitely would be aided by understanding the terminology. The math didn't seem overly complex, but the stress/strain "phase space" things seemed really cool.
Simply beautiful. Great work summarizing an entire Machine Element Design course in Mechanical Engineering into a few minutes!
I have no words for your presentations and content. It will take learning to different world.
All the dislikes are from professors that can't explain these
Fantastically clear explanation compared to the one I got at uni years ago - I think, after all these years, this is the first time I've properly understood this material relating to failure theories! Thanks!
I wish I could see this video sooner it was more helpful than all those university courses
This was very pedagogic and as an mechanical engineer that don’t do much or any FEM, it was really helpful in understanding the analyses engineers way better. 👍Great!
You've just summed up 6 University courses and over half a year of my life in just over 15 min, I'm not sure if I'm happy or frustrated about this but A+ on your efforts 👍
Really appreciated. How simply and in a lucid way you explain is really much appreciated.
You've added value in me, much thanks. Appreciate your efforts. Keep doing so, engineering society needs more of your kind.
Always found this topic bit difficult, I'll say not here onwards...love u brother.
best channel for engineering,the way that you teach is very interesting man.keep it up ,you deserve much more suscriber
What you are doing is great , please never stop. Thanks for making such quality videos
This is a bomb! I'm super excited! Why haven't I found your great channel earlier? Massive thank you!
This is the best explanation of failure theories I have come across till now!! Thank you very much!
Really enjoyed. Heartiest Respect for your effort and contribution. It means a lot for a Mechanical Engineer. We wish for more videos on other topics. Great work!
By far the best explanation of the failure theories that I have seen. Made my life a lot simpler.
Where have you been all my life. I'm watching all of your videos now, as this is the best explanation that made the codes and standards I'm using for work easy to assimilate. Thanks for this beautifully explained tutorial. I'll give anything to be a lifelong learner from you.
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Fantastic video, it is very hard to find learning on this topic explained so simply and clearly elsewhere, keep it up!
I am an instructor on Solid Mechanics and definitely will recommend it to my students. Superb graphical details, congratulations on the job done
Man , you are the einstein for us mechanical engineers out here,!!!...🙏
Best out of best material is provided.
Thanks for giving such an immense knowledge and fascinating video.
I love these high-level comprehensive guides. Often times in our universities, the curriculum goes way too deep and not broad enough for us to have a full grasp of the big picture. Really help a ton in helping me understand the topic.