Understanding Young's Modulus
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- čas přidán 28. 06. 2024
- Young's modulus is a crucial mechanical property in engineering, as it defines the stiffness of a material and tells us how much it will deform for an applied stress.
In this video I take a detailed look at Young's modulus, starting with tensile tests and stress-strain curves, all the way through to what is happening at the atomic scale.
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ERRATA:
- At 05:27 steel is incorrectly shown as being a substitutional alloy. It is actually an interstitial alloy, where the carbon atoms are located between the iron atoms.
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i have a question. I understand everything about Young's Modulus but, when they say a material has for example 210000 N/mm^2 , what do they mean? that it can handle 210000N/mm^2 in the elastic region? and then it goes to the plastic?
Young's modulus, yield strength (the stress at which a material goes plastic) and ultimate strength (the stress at which a material fractures) all have the same units. So it doesn't make sense to say "a material has 210000 N/mm^2", without specifying which parameter we are talking about. 210 GPa is a typical Young's modulus value for steel, so it is likely that in this case the 210000 N/mm^2 is Young's modulus.
@@TheEfficientEngineer and practically this means? that this kind of material can take up to 210000 N / mm^2 and then breaks?
No - it means that the slope of this material's stress-strain curve in the elastic region is equal to 210000 N/mm^2. So for example for an applied stress of 210 MPa, we would get a strain of 0.1%.
@@TheEfficientEngineer Doesn't that also mean that we need 2.1 MN of force to change the materials area by 1 mm^2 ?
@@whitelight32 no, it means that you need 210 GPa stress in material to deform it by 100%, of course it will fail because Young modulus is only appropriate (linear) in elastic range of the material. Simply saying, Young modulus is the number that helps you transform stresses to strains and vice versa but only in the elastic range of the material, for concrete it is 0,20% for compression, for reinforcing steel it is up to ~0.24% in tension
just started A-level physics and im so happy I came across this because no one else explains it so well. thankyou
I feel ya dude. Its tough finding the right information presented in the proper way sometimes. Thats why alot of people struggle with math. Its overly complicated by improper presentation.
It's been 2 years.
How did your A level physics end up??
Is this meaning introductory physics in your country, or advanced?
@@tempestandacomputer6951 It's for the A-levels, so junior and seniors (16-18 year olds).
I get amazed at the wealth of information available to us now. It's fascinating how physics, one of the broadest subjects, is so widely accessible and easier to understand if explained by independent creators rather than by mainstream school teachers. Amazing video, btw!
This is a clear and comprehensible explanation.
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It is evident that you have really put an effort into making everything great. Thank you :)
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Yeah, almost unlistenable
Yeah
Keep up the good work of explaining these material properties in such an interesting and understandable way.
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A short & comprehensive video which well explains the basics. Thanks!
Amazingly beautiful way of elaboration.my whole study of Youngs Modulus at one side and this at other side. Really great work👌. Keep it up
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It is soo detailed!!
Thank you upload more civil engineering related videos..
Amazing explanation, that significance you mentioned is all the reason why this video deserves a like.
This is a really great straight forward video. As a Metallurgist, this was a really good introduction. You explained it way better than my professors did.
I don't wanna be that guy that tells you why your video is wrong. But around 5:30, you show that carbon replaces the iron atoms in your model. In reality, carbon goes in between the iron atoms in the interstitial space. This is hopefully a video that you could do in the future talking about until cells and Crystal structures.
Keep up the good work!
Thank you for your kind comments Jon. You are of course correct about the interstitial nature of steel - my mistake. Hopefully the animation still illustrates the point without being too misleading. A video on unit cells would be really interesting - thanks for the idea!
@pyropulse As an engineer with quite some work experience i must say the following:
The stuff with the atoms is nice and everything but it should have been left out of a beginners introduction video entirely.
The only thing that has to stick in the head of an efficient engineer is that E is a material constant that represents the slope of sigma and epsilon and is different for different materials.
It is also commonly used in combinations like EI and EA. For the advanced theoretical engineer the atom part is important of course ;)
@@a1mforthetop I don't think so, I am a high school student and I get way more intuition if I understand how things work at the atomic level and then use the non-descriptive formulae.
@@nahfid2003 I agree! Atomic-Level-Explanations in Mechanics are the best!
interstitial space means?
Fantastic explanation!
Waiting to watch more videos on Civil Engineering!!
Thank you for the wholesome technical explanation ,it makes comprehension easier in Mechanical Engineering studies
Beautiful video, straight to the point and easy to understand. Subbed :)
Fantastic explanation. Short and on point!
Love the videos so far, excited to see where this goes.
Very good explanation of material properties, hope we can see more video like this. thanks a lot~~
presented all aspects of youngs modulas with great clearity and graphics 👌👌👌
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Thanks
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Awesome, good luck! :)
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Thanks a lot, for your very very good explanation of Youngs Modulus!
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Thank you, so helpful and clear!
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Very well explained sir. Thank you.
keep up the great work. Looks like you're channel is very new but your presentation and video making skills are already on par or better than quite a lot of educational content here on CZcams. I'm going to pass this on to my material science professors as they would be great for freshman engineering students.
Thank you, much appreciated!
Thank you for your job , and I'm wondering If I could take some images from this video to put it in my thesis , if you don't mind cane you send me the resources to put it in the reference
Thank you again
Probably best if you send me an email to hello@efficientengineer.com with specifics.
Plzz upload such videos more in the future so we will build our cocepts in better and efficient way. Thanx.
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Just found your page tonight I find it interesting so far. I’m a dual ticket Red Seal Ironworker and Welder and I’ve performed tensile tests both in school and at work. What you covered is very informative but you could have added more about quenching and tempering and how much tensile strength it can add. How it increases brittleness and ductility. I had a weld test on mild steel with 7018 SMAW welding electrode(rated for 70000 psi per square inch) heated red hot and quenched immediately. It sheared at 138,000 psi on the tensile test which I found very interesting.
I meant lowered ductility, sorry it’s 1am
Please post more videos. Thank you for easily explanation
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nicely explained, thank you
Now I will not forget anything about youngs modulus 👏👏
it was so helpful, thanks alote
Thanks for the informative videos. If you don't mind me asking, which software do you use for animations?
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Well explained Sir.
I have Materials test tmrw thanks for the help
Great video. Wish it were a bit longer. I especially wanted to see a comparison of various materials, including graphene, which has the highest Young's modulus as far as we know.
Thanks Feynstein! Graphene would have been a good one to discuss. I'll try and mention it in a future video.
@The Efficient Engineer You're quite welcome. It seems like I'm an earlycomer to your channel, meaning I'll probably get to talk to you one and one and my feedback will actually matter. Just the way I like it :)
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inspiration comes in many foms!
Great video, I think it would be good to add that bridge should be stiff but not brittle, because it certainly will bend to some extent
Thanks for this.
Thankyou so much❤ for amazing video
Wow, you sound more cheerful on this video! :-D As usual, great lessons...Thank you.
Thankyou Sir , love this ♥️🤝
Hello The Efficient Engineer!
Thank you for your videos! They are great!
I have one question. Why did you show on graphic on 2:38 that wood (pependicular to grain) is stiffer than wood (parallel to grain). I think it must be contrary because if load direction is parallel to grain than grains are tensed by all their length. But if load is pependicular to grains, so only part of grain and the space between grains are strained. Isn't the second case lesss stiff than the first one?
Thanks so much.
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Thank you for your lesson.
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Awesome video! The explanation was brief and right into the point. Thanks a lot!!
I was wondering what sort of software you use to make your videos. The transitions are smooth, and the figures and graphs are animated.
Thanks a lot Nima. I use Blender to make the animations.
Good video that I can recommend to my students. But be careful: in your stress-strain curve, you have greatly overestimated the elastic strain (it's just 0.1-0.5% for most steels) as compared to the plastic strains. Also, while many engineering materials indeed follow Hooke's law, this is by no means generic behaviour. Many plastics, foams, and biological matter are very different :-)
Thanks for the fact checking =)
I want to see how you use and work a young s modulus value within a formula , for example to find the change in length,
thanks and well done
Every topic is very well explained and helps us visualise, which is really important. Hats off to @The Efficient Engineer. But it would be very much appreciated if music is not used.
Awesome video! Btw, just a question. So assuming that stiffness in polymeric material is caused by the intermolecular forces. So the stress-strain curve for polymeric materials flatter in higher stresses cause the molecules are farther apart and the intermolecular forces are weaker and less stress is required to pull the molecules apart. Is that right?
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At around 2:30, i hear wood and composites as an isotropic material. I somehow remember them to be orthotropic. Correct me if i am wrong.
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Thanks for putting such info in concise form. :)
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Will you please make video on moment of Inertia, Radius of Gyration. That will be very helpful.