As a former engineering student and a current engineering professor, I can only applaud these videos. I wish I had this during my student times. I recommend these videos to my students but I think they do not grasp how lucky they are for having this learning material.
You're right, these videos are fantastic. Less Boring Lectures is another channel with excellent videos. This one about bolt pre-tensioning is so good in my opinion: ua-cam.com/video/NsJ0uS7sZxo/v-deo.html
As a mechanical engineering student in my third year I must applaud you for explaining these crucial concepts with such simplicity. The mark of an excellent teacher.
Great video. One another possible reason why engineering stress is used in practice, in addition to difficulty in measuring true stress, is that it better reflects real-life loading scenarios in the sense that the applied load doesn't change when necking initiates.
I'm from Brazil and I learn a lot watching your videos. I'm engineering student and I have no patience for waiting the class for learn. Because of people like you we can learn everywhere. Thanks a lot.
Thank you!! I had only studied Engineering stress-strain curves and it had been bugging me as to how they ended up at such a curve from the results of a UTS test, whether the reduction in cross-sectional area was taken into account or not. You answered it on point! Thank you so much.
Hi! I’m a Materials Engineer and I know that these concepts are sometimes difficult to understand. So, I appreciate your video because you achieve to explain it clearly. Nice job mate!
Great video as usual! I would just like to add that in structural engineering we don't design structures to remain elastic (at least in reinforced concrete), but we still use engineering stress for design because most of the time we work with uniaxial stresses and strains (for example, we simplify reinforcement bars and we assume they are linear elements instead of 3D elements).
Your way of explaining things is great!! You're one of the best. Please don't stop making such videos, I can see this channel growing exponentially in the near future.
Ok! that's it! The other day I let you go free without this. but today, you wont escape for this: I'm subscribing to your channel even If you don't want to. In a serious note: Amazing channel you got there! Keep up the good work!
This is the way our university teachers should teach us. Your concepts are crystal clear. So I want you to make a video on a topic which is unclear to most of egineers . It is the analysis of flexible cables for both concentrated and distributed loads. You must have good visualiw about it I am sure I can't stop myself from subscribing you . You are awesome
This lecture was indeed the best among all the other lectures i came across on youtube....!! Hats off to u sir and huge respect to your amazing explanations skills!! < & love from JADAVPUR UNIVERSITY.
Thank you for clarifying that point. That bugged me ever since because it was never clear which area the load was divided by. It just didn't make sense to me that the strenght of the material was getting worse when it's cross sectional area was smaller for a bigger load.
I'm an engineer myself and i can tell you have great content. With all due respect the background music sounds cheap and sometimes it takes my attention away from your explanations. This might be a personal bias.
I love your videos (from a mechanical engineering undergraduate student)! Keep up the good work. [Consider making these type of videos for a typical undergraduate materials science course]
I appreciate the amount of efforts you put into your videos! I will recommend your channel to my followers! All respect, Hamid :) from Princeton University.
Perfect videos, perfect animation and I appreciate your work. almost seen your every video. just one correction in this video. Stress is Internal resisting force to the applied force per unit area. And not applied force per unit area. Thanks
So to sum up : True stress and strain is mostly higher than engineering stress and strain ( which we calculate theoretically). But with the help of this equations 6:30 true stress and strain can be easily calculated
The concepts you describe in your videos are simply amazing, easy to understand and engrossing. Please keep up the great work. With Respect Parijat (IIT Kharagpur, India)
Bro, your videos are excellent and very informative.. The most good thing is explaining the concepts in animation 👌 🙌 👏... we request you to make more videos... Thanks a billion... 🙏
hello, i am from India. by looking at your content it looks like you are either from civil or mechanical background. i am studying civil right now . JUST LOVE YOUR VIDEO. DON'T STOP. can you do more civil related videos. i have many doubts from strength of materials, structural analysis and environmental eng subjects. can you do more videos on then .The graphics and explanation is great. Thanks.
Hi, your videos are very clear and helpful! Could you make a video explaining the differences between proportional limit, elastic limit and yield point in the stress strain diagrams?
Hi just a bit question as I am still a bit confused. May I know equation σt = σe(1+Ee) is only valid before necking? After necking the accurate measuring is the force / actual section area at that instantaneous point of time?
I highly appreciate the quality content in these videos sir , I wish I could assimilate the subject connect so easily in my college days using so beautiful animation. At our times only knowledge source were books , but times have changed now . I convey my gratitude to you for such beautiful videos at the same time request to upload more such videos related to machine design and theory of machine . Love from India 🙏
Please make about video plastic deformation, finite element method, topology optimization (specifically this), maybe other optimization methods, fluid mechanics, heat transfers, aerodynamic. I wonder these topics a lot. And keep going, I love your videos.
Please make video about normalization. How to normalize the properties and whey we need to normalize. Some of the topics are specific strengths, specific stiffness and strength - to - weight ratio. Thanks
1:01 Does the engineering stress-strain graph ignore the fact that the specimen changes dimension as it is stressed? If that's the case, then why does Stress decrease after UTS for engineering curve?
Good video but as long as the specimen material is under elastic load, the assumption of constant volume (e.g. LA=LoAo) is not real because Poisson's ratio is under 0.5 (a Poisson's ratio of 0.5 is needed to conserve volume of course). Although the plastic strain in the sample does not contribute to volume change, the ever present elastic load (until the specimen breaks) definitely raises the volume of the sample to a degree that is proportional to the current stress level. As such, the assumption you made becomes increasingly more invalid for high strength materials where higher stress levels (and hence elastic strain levels) are present. The volume within the specimen gauge length goes up to a degree that is proportional to the current stress level (and hence the elastic strain level) even for stress levels into the plastic region of the test. The elastic strain level is only dependent on the current stress level regardless of the deformation history and we can of course envisage the level of elastic strain in the sample at any point by test seeing how much the strain would drop if the load were taken away.......... doing this by drawing the modulus slope line to any current point on the stress strain curve. Of course this approach shows the elastic strain to always be Sigma/Young's modulus regardless of deformation history.
Question, is there an even different stress/strain curve in case of compression only. You will not have the area reduction (necking). How would that be accounted, in the plastic side of the graph?
I really love your channel and expertise behind the contents. I am also making some tutorial videos may I kindly ask for the name of the tool that you are using for graphs and basic shape designs?
when we exceed the elastic modulus and plastic deformation occur why the engineering load doesn't stop increasing immediately after? in other words why ultimate strength doesn't happen after elastic modulus ?
As a former engineering student and a current engineering professor, I can only applaud these videos. I wish I had this during my student times. I recommend these videos to my students but I think they do not grasp how lucky they are for having this learning material.
You're right, these videos are fantastic. Less Boring Lectures is another channel with excellent videos. This one about bolt pre-tensioning is so good in my opinion: ua-cam.com/video/NsJ0uS7sZxo/v-deo.html
I was just thinking this exact same thing. I wish I had these videos 5 years ago for the conceptualization of these topics! Great job with the videos!
True sir as a student I must say UA-cam is givin us much luck
Sí, ahora toca aprender también inglés🤠
Question: We can not use engineering and true stress relation after necking but what about strain? Can we use this strain relation abeyond necking?
The quality and clarity of your videos are second to none. Thanks, from a non engineer.
As a mechanical engineering student in my third year I must applaud you for explaining these crucial concepts with such simplicity. The mark of an excellent teacher.
How long are you going to school and what degree do you get?
I'm a engineering student, yours videos are the best. please, never stop doing what you are doing.
Great video. One another possible reason why engineering stress is used in practice, in addition to difficulty in measuring true stress, is that it better reflects real-life loading scenarios in the sense that the applied load doesn't change when necking initiates.
Just revised my engineering... keep it up... you are a good teacher...
Never understood one thing about this in college, understood all of it in a 6 min video
I'm from Brazil and I learn a lot watching your videos. I'm engineering student and I have no patience for waiting the class for learn. Because of people like you we can learn everywhere. Thanks a lot.
Thank you!! I had only studied Engineering stress-strain curves and it had been bugging me as to how they ended up at such a curve from the results of a UTS test, whether the reduction in cross-sectional area was taken into account or not. You answered it on point! Thank you so much.
Hi! I’m a Materials Engineer and I know that these concepts are sometimes difficult to understand. So, I appreciate your video because you achieve to explain it clearly. Nice job mate!
I cannot thank you enough! As a student of mechanical engineering, your videos are unbelievably useful!
Great video as usual! I would just like to add that in structural engineering we don't design structures to remain elastic (at least in reinforced concrete), but we still use engineering stress for design because most of the time we work with uniaxial stresses and strains (for example, we simplify reinforcement bars and we assume they are linear elements instead of 3D elements).
animations make life easier . this channel is awesome .
thank you so much
Thank you for the dark background , Helps my eyes when I watch ur videos at 2am
Your way of explaining things is great!! You're one of the best. Please don't stop making such videos, I can see this channel growing exponentially in the near future.
Ok! that's it!
The other day I let you go free without this. but today, you wont escape for this: I'm subscribing to your channel even If you don't want to.
In a serious note: Amazing channel you got there! Keep up the good work!
Thanks a lot Daniel! :)
This is the way our university teachers should teach us. Your concepts are crystal clear. So I want you to make a video on a topic which is unclear to most of egineers . It is the analysis of flexible cables for both concentrated and distributed loads. You must have good visualiw about it I am sure I can't stop myself from subscribing you . You are awesome
Better than Indian you tube channels' videos on this topic
Awesome. I am a doctoral student, and found your videos amazing. Super easy to understand, but extremely effective. Many thanks.
This lecture was indeed the best among all the other lectures i came across on youtube....!! Hats off to u sir and huge respect to your amazing explanations skills!! <
& love from JADAVPUR UNIVERSITY.
Concepts are explained very clearly I'm having my FEM subject this semester and you're helping me allot
How in the world is your content free on youtube?!
Your videos are simply amazing and really helped me a lot, Cheers!
Thank you very much mate and may God bless you and guide you to the righteous path.
Where were you when I was in undergrad and grad school?!?! Great videos by they way, I am using it to refresh my engineering math for job interviews.
As an engineering student, I can say that this video is nothing but brilliant
Thank you for clarifying that point.
That bugged me ever since because it was never clear which area the load was divided by. It just didn't make sense to me that the strenght of the material was getting worse when it's cross sectional area was smaller for a bigger load.
Haven't seen any better channel on youtube. Great work guys.
I'm an engineer myself and i can tell you have great content. With all due respect the background music sounds cheap and sometimes it takes my attention away from your explanations.
This might be a personal bias.
Sir please don't judge you efforts and skill by your no. of Subscribers...
Your work deserve millons of Subscribers...
I love your videos (from a mechanical engineering undergraduate student)! Keep up the good work. [Consider making these type of videos for a typical undergraduate materials science course]
I appreciate the amount of efforts you put into your videos! I will recommend your channel to my followers!
All respect, Hamid :) from Princeton University.
Thanks Hamid! :)
I need more of your videos on strength of materials.
Thank you, you're indeed the best engineering tutor on this platform
I can't just get enough of your awesome explanations. I will certainly recommend your channel to my fellow engineers
Great to hear, thanks Simeon!
Perfect videos, perfect animation and I appreciate your work. almost seen your every video. just one correction in this video. Stress is Internal resisting force to the applied force per unit area. And not applied force per unit area. Thanks
videos are very good for understanding. A picture says 1000 words
Your vedios are gems , it needs to go viral among mechanical engineers,
Please make more vedios
You are going places!!
Thank you. Compliments. Theory and visuals are at the best. And music is fine whoever whatever says.
Awesome..Hats off you for your efforts.. I too wish I had these videos during my college days..
this is a brilliant simplified derivation of rules thank you
So to sum up :
True stress and strain is mostly higher than engineering stress and strain ( which we calculate theoretically). But with the help of this equations 6:30 true stress and strain can be easily calculated
by far the best tutorials i have seen! good work
The concepts you describe in your videos are simply amazing, easy to understand and engrossing. Please keep up the great work.
With Respect
Parijat (IIT Kharagpur, India)
Please upload some more regularly............ Related to civil engineering and mechanical !!!!!!...
This is a missing part when I was learning the stress - strain test. True strain and stress are precisely depicting the tensile experiment.
One of the best videos I've seen in a while 👏🏼
brother grate explanation , i never learnt this in clg like this.
Conceptual clarity is 💯 post more videos on strength of materials
I would like to want your channel will be popular on the youtube. Really dude thank you very much...
What is the program that made this video???
That is a great work 😍😍
He mentioned on the other video that it was made with Blender
This is great dude,i'm a structural engineer and i really enjoyed your videos
Bro, your videos are excellent and very informative.. The most good thing is explaining the concepts in animation 👌 🙌 👏... we request you to make more videos... Thanks a billion... 🙏
hello,
i am from India. by looking at your content it looks like you are either from civil or mechanical background. i am studying civil right now . JUST LOVE YOUR VIDEO. DON'T STOP. can you do more civil related videos. i have many doubts from strength of materials, structural analysis and environmental eng subjects. can you do more videos on then .The graphics and explanation is great.
Thanks.
Thanks Adil. Working on more videos as we speak!
This is the best engingeering videoes I have ever seen! Thanks alot for the uploads! Best regards from an civil engineer student
It's very useful, you have a magical power for explaining ideas, thank you!
simplicity make your videos great
Following you form france , Your videos are really interesting and amazing. Keep going
This is the best video by far
You can also define the engineering stress using the curriculum modulus / target time of graduation -formula
so this is where the engineering memes come from: e = 2.71 ~ 3, π = 3.14 ~ 3 therefore e = π ... if it's close enough, it's good enough😂
I love your videos. I hope we can get more of them
Hi, your videos are very clear and helpful! Could you make a video explaining the differences between proportional limit, elastic limit and yield point in the stress strain diagrams?
Awesome videos watched all..to clear basic concept clearly go through this videos... waiting for next one
You are great hope you upload new videos
This channel is AWESOME
Hi just a bit question as I am still a bit confused. May I know equation σt = σe(1+Ee) is only valid before necking? After necking the accurate measuring is the force / actual section area at that instantaneous point of time?
My kind request to post a video for every 2 or 3 week. Thank you for posting those videos.
Thanks Sharan. I'm aiming to post a new video every 3 weeks!
I highly appreciate the quality content in these videos sir , I wish I could assimilate the subject connect so easily in my college days using so beautiful animation. At our times only knowledge source were books , but times have changed now . I convey my gratitude to you for such beautiful videos at the same time request to upload more such videos related to machine design and theory of machine . Love from India 🙏
Please make about video plastic deformation, finite element method, topology optimization (specifically this), maybe other optimization methods, fluid mechanics, heat transfers, aerodynamic. I wonder these topics a lot. And keep going, I love your videos.
A few of these are definitely on my list!
@@TheEfficientEngineer thanks, what about topology optimization?
Very nice explanation!
This was so useful, thank you so much!
Sangat bagus, salam dari Blitar, Indonesia mas🙏🙏
I thank you from the bottom of my heart!
An amazingly helpful work! Thank you so much for the videos, hope there'll be more to come
Looking for more...best visuals to understand
Your videos are unique , and I enjoyed it.
Please make more videos 🙏
Thanks
Please make video about normalization. How to normalize the properties and whey we need to normalize. Some of the topics are specific strengths, specific stiffness and strength - to - weight ratio. Thanks
do you have example problems of true stress and true strain?
Excellent illustrations thanks a lot
1:01 Does the engineering stress-strain graph ignore the fact that the specimen changes dimension as it is stressed? If that's the case, then why does Stress decrease after UTS for engineering curve?
Your content quality, video and explanation is top notch 🎖️🏆
This was really helpful. Many thanks!
Excellent Lecture!
Good video but as long as the specimen material is under elastic load, the assumption of constant volume (e.g. LA=LoAo) is not real because Poisson's ratio is under 0.5 (a Poisson's ratio of 0.5 is needed to conserve volume of course). Although the plastic strain in the sample does not contribute to volume change, the ever present elastic load (until the specimen breaks) definitely raises the volume of the sample to a degree that is proportional to the current stress level. As such, the assumption you made becomes increasingly more invalid for high strength materials where higher stress levels (and hence elastic strain levels) are present. The volume within the specimen gauge length goes up to a degree that is proportional to the current stress level (and hence the elastic strain level) even for stress levels into the plastic region of the test. The elastic strain level is only dependent on the current stress level regardless of the deformation history and we can of course envisage the level of elastic strain in the sample at any point by test seeing how much the strain would drop if the load were taken away.......... doing this by drawing the modulus slope line to any current point on the stress strain curve. Of course this approach shows the elastic strain to always be Sigma/Young's modulus regardless of deformation history.
even my prof recommends your videos, precise and simple
I cracked all interview because of you.. than you
And also do make a video on buckling under transverse loads. Thank you 😉
Awesome explanation
Sir
Which software you use for presentation
Blender 😁
Sirji aap b yahan
@@XavierXe ultimate animation hai isnki
I wish mujhe animation jaada achi aati
@@gear.institute sir virtual lab hai online website uspai animation hoti hai
@@XavierXe plz guide me aur give me link plz
Main unpad hu iss mamle mein
@@gear.institute sir UA-cam comment delete kar deta hai link agar share karu
MAN, que quality of your videos is fucking amazing you need to upload more of these
One question. Why the engineering curve drops down after ultimate strength point?
Very informative video. Thans for the help
Best channel!
Question, is there an even different stress/strain curve in case of compression only. You will not have the area reduction (necking). How would that be accounted, in the plastic side of the graph?
Please make more videos for frame structure design for civil engineers
Thank you, this was very helpful
I really love your channel and expertise behind the contents. I am also making some tutorial videos may I kindly ask for the name of the tool that you are using for graphs and basic shape designs?
Expert kindly also tell me that for which material this stress strain curve you have choosen to describe ??
when we exceed the elastic modulus and plastic deformation occur why the engineering load doesn't stop increasing immediately after?
in other words why ultimate strength doesn't happen after elastic modulus ?
Why in engineering curve , the stress declines after "ultimate tensile strength point " ? ! !
One day I'll conquer all your videos in understanding, till then I'll have to study....