Understanding Failure Theories (Tresca, von Mises etc...)
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- čas přidán 1. 06. 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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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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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.
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'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.
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.
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 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 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
The colleges and universities need teachers like you who are ready to learn in order to teach others. I admire you.
In my 20 years experience I never heard a much clear explanation/presentation of these concepts. Great effort and very good job.
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
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
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.
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.
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.
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
We all should fund him to open his own university!
Be a Patreon
I agree!
I have an exam in construction mechanics tomorrow, this was truly a godsend, thanks!
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.
I can't thank you enough.
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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.
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.
I'm an engineer from China, once worked in almost all continents for nearly 40 years, thumbs up to this video. By the way, the monotonous tones of my university lecturers drove me out of most classes, I had to spend most of my time in library to learn by myself. Fortunately for me, Chinese government then paid almost all my education.
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!
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.
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
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.
My attendance is 100% ... i you r my professor....
i remember this topic coming into my engineering classes as a tornado destroying all my motivation, being explained by professor in a so inaccessible manner that made me feel like “i’m too stupid as an engineer that cannot understand materials physics, that is why i am bounded to management engineering” … after i guess 3y now, i am fully master graduated engineer but only after this video i saw how straightforward and pretty logical this concepts are if presented with the aim to let people understand, especially when u extended on the 3-axis the 3 failure theories for ductile materials. As Einstein said “The definition of genius is making it simple” even if things are born complex and need to be assessed with rigor. Very well done and thanks.
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.
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.
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
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.
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
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
Great explanation. Looks like this is going to be one of the top engineering channel on CZcams very soon. The amount of hardwork you put in this video should deserve it.
Man , you are the einstein for us mechanical engineers out here,!!!...🙏
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.
Great job! Every teacher of Strengh of Materials and Mechanical of Solids need see this video to getting improve your explanation.
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
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!
Well summarized, beautifully made, cannot but love it. Great value in mere 16-minute video. Thumbs up from a fellow engineer.
This was one of my favorite courses, especially because we got to learn the basics of designing things.
The fact that you put this much effort is mindboggling. I am currently doing this course and this really helps out a lot. Thanks!!
Thank you for posting these videos. Currently studying for a degree in Engineering and your content really helps as an aid to my classes. Genuinely believe what you cover has better enabled me to do better in university. Thank you and good luck in future videos
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
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.
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!
I wish I could see this video sooner it was more helpful than all those university courses
Very well presented, clear and understandable. Thank you! I actually for the first time understand now.
One thing I want to tell you dude!
You are the coolest professor in the world 😎😎😎😎😎😎😎🤯🤯🤯
, 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!
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.
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
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 one of the most underrated educational videos I've ever seen. Congratulations, the explaining es amazing!
I am an instructor on Solid Mechanics and definitely will recommend it to my students. Superb graphical details, congratulations on the job done
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
One of the best educational channels around here. Please keep it up! Awesome work.
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!
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
I've just invated all my students to come see your videos.
Thanks! :)
These are incredible videos. The graphics are extremely well-done. Explanations are very clear and informative while never droning on or going off on long tangents. This should be the standard for college-level instruction.
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.
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.
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.
Awesome. I am a doctoral student, and found your videos amazing. Super easy to understand, but extremely effective. Many thanks.
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!!
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 😌
Where was this a month ago, my professor didn't teach it anywhere near this well!
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!
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!
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
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 👍
I have no words for your presentations and content. It will take learning to different world.
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.
Oh my god, you're explaining so well these concepts. My compliments!!
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..
This was so far the best video on this topic ever! Definitely The Efficient Engineering it is.
I have a Ph.D. in ME and this is the best summary I`ve ever seen in failure theories, great job!
Simply beautiful. Great work summarizing an entire Machine Element Design course in Mechanical Engineering into a few minutes!
Only channel till date that has wonderful visuals of complex mechanics concepts. Thank you for such amazing content.
One of the best educational videos I've came across in a long time. You got yourself a new subscriber.
Infinite thanks to you sir . This was my fav topic in engineering but I find more hard to learn through books. But at last you fulfilled my engineering . Learning a hard topic in just 15min is impossible but you made it possible. I think my juniors no need to invest money on universities to learn engineering. 👏👏👏👏
The way you guys have explained this is just phenomenal kudos
Really appreciated. How simply and in a lucid way you explain is really much appreciated.
This is what we learnt in whole a semester of Engineering college...it is summarised very well...thank you🌞
Bloody hell bruh i sat through 2 lectures of this stuff and you explained it perfectly in 15 minutes. You are doing amazing work, please do keep it up.
Seriously..this explanation helped me much...when i learned about this i cannot put the red string between stress, mohr, failure theories..but connected all information so i can understand better..gud luck..love this channel so much
Thank you for such an intuitive explanation. I can have the first impression of what these definition is.
Good luck and stay safe!
The way you explain things is simply awesome. Most of the books just gloss over the equation and isn't very helpful for intuitive understanding of the concepts.
Never been to College in my life! Didn't need to be. I've understood structural integrity/failure since I was a kid. In 9th grade, I won the Bridge Strength contest when we were tasked to build bridges with these super soft matchstick-like pieces of wood. You were only allowed so many pieces and so many glue points. Then after a day of drying, it was on to the testing.
The substructure of my design held 212lbs. I still have that bridge. As I grew up, I started noticing similar designs and the same design being used everywhere. I believe I went to school stoned that day. I have severe ADHD and was on Adderall. So basically, my brain slowed down enough to actually THINK through the task at hand and build what made sense to me. It worked and I WISH I would have pursued a career in the field. But I chose a different path...
Awesome video, something actually worth watching!
By far the best explanation of the failure theories that I have seen. Made my life a lot simpler.
I really find this most knowledgeable video about failure theory. I have been struggling to learn this since I started my professional career. Well done. Huge gratitude for you sir!