Understanding Young's Modulus

[@MFDOOMgr]

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?

[@TheEfficientEngineer]

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.

[@MFDOOMgr]

@@TheEfficientEngineer and practically this means? that this kind of material can take up to 210000 N / mm^2 and then breaks?

[@TheEfficientEngineer]

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%.

[@whitelight32]

@@TheEfficientEngineer Doesn't that also mean that we need 2.1 MN of force to change the materials area by 1 mm^2 ?

[@gieaudio8762]

@@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

[@ajeynager8452]

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!

[@ehoward1392]

Wikipedia is my book… I find myself having a deep spiritual thought next thing you know I’m clicking on all the blue words looking at the facts of words like sound, it really is amazing

[@jongeiser7569]

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!

[@TheEfficientEngineer]

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!

[@a1mforthetop]

​@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 ;)

[@nahfid2003]

@@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.

[@updatedotexe]

@@nahfid2003 I agree! Atomic-Level-Explanations in Mechanics are the best!

[@hridaysahoo3101]

interstitial space means?

[@MANJU1ANANTH]

Very useful and simple refresher. I had forgotten these stuff from my college days. I was doing some project with my driveway to eliminate lateral stress on a retaining wall thereby extending its life. I was stuck at a point. I could get the vertical stress figured out but horizontal is what mattered. This video refresher cleared everything and I am at completion of my project. Thank you for the educational videos.

[@kalki3060]

This is a clear and comprehensible explanation. The sounds in this video are sooo pleasing and captions are perfectly timed. It is evident that you have really put an effort into making everything great. Thank you :)

[@zachydrogeo]

This channel is the yardstick for engineering education

[@tanuthakur4161]

It feels sad that you have very less subscribers. But I must say the way you explain concepts is awesomeeeee..... Looking for many more concepts from you ....

[@sirigiri7091]

Ya your right , sir your videos are really good , l like them a lot , we can understand easily and gain good practical knowledge .

[@abdirahmanabdulbari6665]

Hello by now you must have graduated

[@mozammelmia3714]

Awesome. I am a doctoral student, and found your videos amazing. Super easy to understand, but extremely effective. Many thanks.

[@MrShaan1000]

Everything is great about this video, the explanation is top-notch supported by equally great animations and designs. This is the first video I am seeing on your channel. Looking forward to watching other videos and understanding my concepts better.

[@rikhilnell2623]

MAN! People like you deserve more subscribers!! Keep up the good work👍

[@tomasenrique]

These series of videos NEVER GET OLD!! thanks!

[@ryanpfannenstiel7517]

I wish I had these videos before solids and egineering experinentation courses. Incredibly well done. Ill be sure to lead other people your way when they are introduced to these concepts.

[@appleitree]

Amazing explanation, that significance you mentioned is all the reason why this video deserves a like.

[@hemrajmeena4673]

presented all aspects of youngs modulas with great clearity and graphics 👌👌👌

[@ashishrai2098]

the kind of youtube channel i was searching. thanks it has helped me in my physics course👍👍👍 u r the best

[@youngkim5909]

Correction if I may. 5:37 depicts the Fe atoms being replaced by Carbon, that's what happens in substitutional alloys. Steel is a interstitial alloy, the carbon atoms to not replace Fe atoms, instead they reside in the space between the Fe atoms. This is VERY important since the formation of martensite depends on the position of those C atoms to change the crystal structure of steel into BCT(body centered tetragonal)

[@Praveenstein]

Great, but i guess he wanted to keep the atomic level details minimum...so the beginners don't get confused, but the overall idea is correct

[@jakegray6987]

Thank you so much bro I got an engineering final today this helped quite a bit as well as several of your other videos. You have for sure earned yourself a subscriber.

[@TheEfficientEngineer]

Awesome, good luck! :)

[@kvsalahuddin5]

Channel is under rated ...i expected millions of subscribers ❤

[@emanuelnolasco3745]

Really interesting video!!! It is really awesome how this topic can be so simple to explain in a video of less than 7 minute instead when you are at university class normally takes 1.5 hours

[@ARBB1]

Fantastic gem of a channel here.

[@paulcarroll5602]

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.

[@paulcarroll5602]

I meant lowered ductility, sorry it’s 1am

[@zahidarafeeq4827]

😭😭😭😭😭😭😭😭 TY..TYSM! U r an ultra pro legend! God bless u! Why don't u tutor our teachers as well..I don't get a single word in his lecture! I feel blessed to have u as my tutor...TYSM!

[@GeniusEngineering]

Keep up the good work of explaining these material properties in such an interesting and understandable way.

[@muhammadhaseebmujtaba5960]

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

[@ngqobilezikhali6871]

Thank you for the wholesome technical explanation ,it makes comprehension easier in Mechanical Engineering studies

[@richie50]

Your videos are great. They help me so much. You should feel really proud of all the value u provide for people, at no cost to them!

[@lazytommy0]

I googled what my vise grip tool was made of and ended up with a bachelor's in engineering lmao

[@elliotskunk]

inspiration comes in many foms!

[@dimchohvarchilkov683]

A short & comprehensive video which well explains the basics. Thanks!

[@AhmedKhan-mt7ky]

Bro the background music in disturbing the concentration. Please upload it with a smooth and lighter music like in your stress strain demonstration video. Thanks

[@manojnagsharma888]

It is soo detailed!! Thank you upload more civil engineering related videos..

[@superpilun]

Love the videos so far, excited to see where this goes.

[@NILESHGCEK]

Now I will not forget anything about youngs modulus 👏👏

[@shripadnarale2150]

Plzz upload such videos more in the future so we will build our cocepts in better and efficient way. Thanx.

[@Д.Түвшинбаяр]

5:57 If i understand correctly... In bending load. It is strain that increases stress which results failure of material.

[@许雷-l7c]

Very good explanation of material properties, hope we can see more video like this. thanks a lot~~

[@nesmaeysa364]

very informative with simplicity

[@guitarman77084]

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 KZbin. I'm going to pass this on to my material science professors as they would be great for freshman engineering students.

[@TheEfficientEngineer]

Thank you, much appreciated!

[@isiTsotsi]

Fantastic explanation. Short and on point!

[@salimkhoso7995]

The best presentation ever made Thanks

[@JP_916]

hey, continue the videos. it helps me a lot. thank you!!!

[@Shreyas_Sawant]

Fantastic explanation! Waiting to watch more videos on Civil Engineering!!

[@baqirhussein1109]

Thx man, i have exam tomorrow, you helped me a lot ❤

[@sriharshamukuri1598]

Great explanation in each and every video .feeling very happy to listern every video...expecting even more videos like this ..

[@safdarali3829]

I am from India your video is very efficient for me thanx a lot

[@lucascrupi5637]

Amazing content keep it up. love the effort to quality in the videos

[@FacultyDZ]

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

[@TheEfficientEngineer]

Probably best if you send me an email to [e-mail] with specifics.

[@adelesmith7827]

Thank you!!! Glad I found your channel, I have a design principle module at uni

[@feynstein1004]

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.

[@TheEfficientEngineer]

Thanks Feynstein! Graphene would have been a good one to discuss. I'll try and mention it in a future video.

[@feynstein1004]

@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 :)

[@allancng]

Excellent. Greatings from Colombia!

[@eriktempelman2097]

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 :-)

[@loadstone5149]

Thanks for the fact checking =)

[@GamingShiiep]

4:14 Hey nice, dislocations! We need to know quite a bit about them for our geodynamics/microtectonics M.Sc. class, so I know how much more detailed all that can get. Sometimes a less stiff material can be still desired, considering (brittle) failure, right? I mean if that bridge goes from "oh, here it works to "oh, here it collapsed" in an instant, when that would be pretty bad. Also one must keep SLS and ULS in mind. There's one thing I didn't quite understand yet though. Most of the time you're talking about elastic and plastic deformation. What's with brittle deformation? Or is brittle "deformation" simply plastic deformation after the strain was too high? Will have to keep watching some youtube videos about brittle failure, as well as rheology models considering not only strain but also strain rate. I'm very grateful for your videos and visualizations!

[@rachelkimemia5897]

Your slides are so good. The background, presentation,.....😃

[@davidsvarrer8942]

Thanks a lot, for your very very good explanation of Youngs Modulus!

[@JC_Deutscher]

excellent!! very illustrative and to the point. Thanks

[@onkarchavan7253]

Great going hope to have more vedio s in future

[@xxDeadlyMohawkx]

This channel is amazing. Keep making videos!!!!

[@hakandede8588]

Amazing videos, helped me a lot. Keep doing these stuff :)

[@rumeenchowdhury6976]

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.

[@KirillBelov92]

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?

[@TheMightyThim]

Beautiful video, straight to the point and easy to understand. Subbed :)

[@bantothakur608]

So good an explanation it was..... believe me your subscribers are gonna increase with the speed same as the speed of light......good luck.... and I'm a subscriber too......=)

[@BackyardBirdsofAustralia]

These videos are great, thank you!!

[@jawadnoor2298]

I have Materials test tmrw thanks for the help

[@washingtonalmeida75]

Wow, you sound more cheerful on this video! :-D As usual, great lessons...Thank you.

[@pankajpandya5438]

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. Nice videos: this one and others on this channel. I sometime stream them on TV as well. Thanks for putting such info in concise form. :)

[@mohamadafiq5870]

Superb content. Keep going!

[@pacifictimes-p2f]

Very precise and informative

[@pelemariusv]

At 5:10 why elastic deformation is GPa and ultimate tensile is MPa... When you extend an material in order of GPa for sure you go over MPa ... I miss something?

[@sameerrai4479]

Ultimate strength is in MPA and Young's modulus in GPA because Young's modulus is theoretical and material would break before it reaches that point . Ultimate strength is the value where a material will fail

[@ymdh123]

very useful videos, help a lot! Thanks!

[@salmankhanmohmand9174]

Great aninations and best teaching method....but the number of lectures are not enough to fulfill our courses..Hope that it get benifits to students in near future🥰

[@manuboker1]

Wonderful Lectures ! Thanks.

[@Vipul.Canada]

wonderful presentation

[@mishalconnect2996]

Awesome explanation. Thanks

[@rachitmalya9521]

Very well explained sir. Thank you.

[@chaitanyadeshmukh8341]

excellent work

[@craxd1]

The rule of thumb that we used, for a safety factor, was 1/2 the yield stress. Though the value can be moved, we used this rule of thumb for almost every application.

[@muhammedlatifbekci7725]

Thank you so much. This channel is perfect.

[@mandsc4120]

Really helpful videos. 👌

[@aadharshram4975]

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?

[@bkraj26]

Great Sir!!! Kudos!!! Please post more videos

[@mzakariya6574]

I learned alot here. Thanks man!

[@St-jh8pk]

Thank you, so helpful and clear!

[@ItsShahrzadG]

god bless you efficient engineer

[@srinunaikbanavat8077]

Well explained Sir.

[@Mecha_Subh]

2:33 how? We say modulus of elasticity is a material property than how is it changing on type of applied load(parallel or perpendicular to grain) ???

[@TheEfficientEngineer]

The reason is that wood is an anisotropic material, and so its material properties are different in different directions.

[@Mecha_Subh]

@@TheEfficientEngineer 👍

[@jackeki7689]

Thankyou Sir , love this ♥️🤝

[@venkatseweyer4238]

amazing content. keep it up

[@karthick86c]

Thanks for the beautiful videos. Subscribed. But please consider not having the background music . It is quite distracting for a serious subject.

[@chandan_loq]

extremely helpful

[@sameerrai4479]

I don't get one thing, at 5:14 what ksi means in Young's modulus? Sir, can u reply pls...

[@Eric-sq4hd]

watching these to study for the MCAT. You should make "Efficient Doctor" videos haha

[@thecultofdeadcow]

You will become engineer of human body don't worry. 😁👍

[@yaseenwazir5844]

Great job

[@rushipatel7083]

Thankyou so much❤ for amazing video

[@asmaaabdulhamid2292]

it was so helpful, thanks alote

[@govindaadalinge8759]

Super Videos...Keep it up bro...

[@gholamalialmasi8906]

Thank you for your information and knowledge to us

[@brankelly1921]

thank youuuuuu thank you thank you thank you for making core physics fun and understandable. Liked and subscribed :)

[@hridaysahoo3101]

Sir my doubt really got cleared. Thank you, sir. Sir, it would be better if you decrease the background music just a bit. yours faithfully Hriday Sahoo, India

[@snoopdogofscience6873]

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

[@gopiacs2184]

just wow man amazing content keep going upload more videos pls