Understanding True Stress and True Strain

[@MegaOjetemoreno]

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.

[@ericmanternach2340]

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: kzbin.info/www/bejne/hKStYaiJbNiNrtE

[@mattderickson3426]

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!

[@eboian_x6522]

True sir as a student I must say KZbin is givin us much luck

[@rodrigof.3488]

Sí, ahora toca aprender también inglés🤠

[@sebakoli6781]

Question: We can not use engineering and true stress relation after necking but what about strain? Can we use this strain relation abeyond necking?

[@ScarletKnightmare]

The quality and clarity of your videos are second to none. Thanks, from a non engineer.

[@mansaranbaath3534]

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.

[@i8764theKevassitant]

How long are you going to school and what degree do you get?

[@moaqirahmad5948]

Just revised my engineering... keep it up... you are a good teacher...

[@wyllerdesousa1955]

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.

[@eliejororirakiza2202]

Never understood one thing about this in college, understood all of it in a 6 min video

[@neelgkumar]

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.

[@daviddemiguel1614]

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!

[@sulskull]

I cannot thank you enough! As a student of mechanical engineering, your videos are unbelievably useful!

[@justinroy5298]

I'm a engineering student, yours videos are the best. please, never stop doing what you are doing.

[@Danielagostinho21]

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!

[@TheEfficientEngineer]

Thanks a lot Daniel! :)

[@nowyouknow-sortof]

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.

[@chiragdugar8183]

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.

[@chinmaygourkhede5380]

Thank you for the dark background , Helps my eyes when I watch ur videos at 2am

[@math4engzz664]

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).

[@mohabsoliman7172]

animations make life easier . this channel is awesome . thank you so much

[@physicslover1950]

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

[@mayanklakhera527]

Haven't seen any better channel on youtube. Great work guys.

[@jatto9856]

How in the world is your content free on youtube?! Your videos are simply amazing and really helped me a lot, Cheers!

[@muhammadzraittayyab9596]

Better than Indian you tube channels' videos on this topic

[@mozammelmia3714]

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

[@pedromanuelcastorena8525]

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]

[@SouvikCivil]

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.

[@nuclearmage]

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.

[@GasPa-s1o]

As an engineering student, I can say that this video is nothing but brilliant

[@AlgoDar]

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.

[@TheEfficientEngineer]

Thanks Hamid! :)

[@abbosbekkhudayberganov820]

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😂

[@mollysmith2713]

Thanks!

[@madhusudhanmsd1321]

Your vedios are gems , it needs to go viral among mechanical engineers, Please make more vedios You are going places!!

[@pavankumar132]

Concepts are explained very clearly I'm having my FEM subject this semester and you're helping me allot

[@en6waeii]

Thank you, you're indeed the best engineering tutor on this platform

[@shahidchaudhary52]

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

[@simeonogbonna568]

I can't just get enough of your awesome explanations. I will certainly recommend your channel to my fellow engineers

[@TheEfficientEngineer]

Great to hear, thanks Simeon!

[@Albian2405]

This is the best engingeering videoes I have ever seen! Thanks alot for the uploads! Best regards from an civil engineer student

[@bobo123125]

Thank you very much mate and may God bless you and guide you to the righteous path.

[@BrayandPerez]

One of the best videos I've seen in a while 👏🏼

[@habeebbabatundeajose3537]

I need more of your videos on strength of materials.

[@awnishshaswat4957]

Sir please don't judge you efforts and skill by your no. of Subscribers... Your work deserve millons of Subscribers...

[@jhn1016]

by far the best tutorials i have seen! good work

[@andreiparaschiv7547]

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.

[@prakash-tn6ql]

Please upload some more regularly............ Related to civil engineering and mechanical !!!!!!...

[@parijat31]

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)

[@charles-antoinegagne6109]

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.

[@Kalam_Circle]

Awesome..Hats off you for your efforts.. I too wish I had these videos during my college days..

[@azizuke]

This is great dude,i'm a structural engineer and i really enjoyed your videos

[@eng.mustafak.e.4962]

What is the program that made this video??? That is a great work 😍😍

[@ajayaj6239]

He mentioned on the other video that it was made with Blender

[@burakyazc9108]

I would like to want your channel will be popular on the youtube. Really dude thank you very much...

[@rushi.modhave]

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

[@BoZhaoengineering]

This is a missing part when I was learning the stress - strain test. True strain and stress are precisely depicting the tensile experiment.

[@giovagioche]

Following you form france , Your videos are really interesting and amazing. Keep going

[@nyamsurenochirbat4547]

Thank you. Compliments. Theory and visuals are at the best. And music is fine whoever whatever says.

[@adiladeeb2899]

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.

[@TheEfficientEngineer]

Thanks Adil. Working on more videos as we speak!

[@gear.institute]

Awesome explanation Sir Which software you use for presentation

[@XavierXe]

Blender 😁 Sirji aap b yahan

[@gear.institute]

@@XavierXe ultimate animation hai isnki I wish mujhe animation jaada achi aati

[@XavierXe]

@@gear.institute sir virtual lab hai online website uspai animation hoti hai

[@gear.institute]

@@XavierXe plz guide me aur give me link plz Main unpad hu iss mamle mein

[@XavierXe]

@@gear.institute sir KZbin comment delete kar deta hai link agar share karu

[@GabrielCarvalhoACunha]

This channel is AWESOME

[@kishortembhare9822]

brother grate explanation , i never learnt this in clg like this.

[@vasanthkannan3398]

This is the best video by far

[@deepakranjan5188]

videos are very good for understanding. A picture says 1000 words

[@rathnakumarv3956]

@4:21 min; even before necking the cross sectional area, A is not equal to Ao then why AL = Ao Lo not valid only after necking??

[@fieldarc725]

Because as before necking the length also changes as Area changes in a proportion but after necking the proportion is broken.

[@fieldarc725]

He says how the volume constant changes only after necking. Not before so if A changes before necking we can say that L is also changing in proportion

[@nimanaghash6093]

I love your videos. I hope we can get more of them

[@krishnakumarramamurthi5283]

Conceptual clarity is 💯 post more videos on strength of materials

[@robwindey9223]

Very nice explanation!

[@sharana.p5921]

My kind request to post a video for every 2 or 3 week. Thank you for posting those videos.

[@TheEfficientEngineer]

Thanks Sharan. I'm aiming to post a new video every 3 weeks!

[@atriagotler]

You can also define the engineering stress using the curriculum modulus / target time of graduation -formula

[@hakankosebas2085]

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.

[@TheEfficientEngineer]

A few of these are definitely on my list!

[@hakankosebas2085]

@@TheEfficientEngineer thanks, what about topology optimization?

[@Shiafighter110]

You are great hope you upload new videos

[@benlee3545]

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?

[@zeynepozdener8034]

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?

[@anhducngole8903]

An amazingly helpful work! Thank you so much for the videos, hope there'll be more to come

[@adepusrikanth6292]

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... 🙏

[@praveeningavle7274]

Awesome videos watched all..to clear basic concept clearly go through this videos... waiting for next one

[@alimoharam4362]

this is a brilliant simplified derivation of rules thank you

[@hruthvik]

simplicity make your videos great

[@LikhitK]

I thank you from the bottom of my heart!

[@jameshodges7356]

quick question, at 6:03 what does the big slash mean/ do thanks

[@onkarchavan7253]

Great initiative hope to see the next vedio soon

[@Technoboy928]

Your content quality, video and explanation is top notch 🎖️🏆

[@WildanBustomi-c7c]

Sangat bagus, salam dari Blitar, Indonesia mas🙏🙏

[@elnaeemabdalla]

Excellent illustrations thanks a lot

[@tareqal-hababi2954]

It's very useful, you have a magical power for explaining ideas, thank you!

[@hikirj]

This was so useful, thank you so much!

[@santoshmaurya87]

Your videos are unique , and I enjoyed it. Please make more videos 🙏 Thanks

[@JoshKerbyCaballero]

do you have example problems of true stress and true strain?

[@lingarajmishra8981]

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 🙏

[@Official_Kezzie]

This was really helpful. Many thanks!

[@greenfoodpower6961]

Excellent Lecture!

[@edgarcarrillovazquez8576]

MAN, que quality of your videos is fucking amazing you need to upload more of these

[@MitulGamit-cj6hr]

Looking for more...best visuals to understand

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?

[@giovannilunardi1261]

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?

[@erickcastellanos6814]

Very informative video. Thans for the help

[@shubhamkshirsagar1182]

That video quality though ❤️🔥

[@ronaldinho711990]

this is awesome. please keep going

[@mahmoudlasheen5762]

Great content, but does this cover the strain hardening effect?

[@bobstevens7028]

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.

[@josholunlade]

Thank you, this was very helpful

[@MrAnoo91]

Great work What is the programme you made these video with

[@muhammadomarkhayyamkhan3593]

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

[@AJ-et3vf]

Awesome video, thank you!

[@Gfaitcoco]

Best channel!

[@a_kishan]

Oh no! I really couldn't let me go ahead without subscribing!