oh my.. this was amazing. I specially liked how you opened up the second moment of area. Most of the books just tell you its Iz=int y^2 Da and then some shallow explanation and how you actually calculate it. Thank you so much! I linked this channel to my fellow engineering students.
the negative strain denotes the compression side of the beam. I chose to say that negative strain is to the right and positive strain is to the left in order to match the deformed shape. Instead of arrows, it might be better to just think of strain values at each point along the section of the beam.
Thank you very much. I'm having my last bachelor's degree exam tomorrow and these videos of yours are being super helpful. (If I may, you say BAM way too much! I would save it for the final formula only)
hello, i would just like to ask why did the strain(max) was changed into stress(max) during the derivation of normal stress by substituting it in hooke's law in 4:17 of your vid. i'm confused. please help me.
At 4:25 where does the σmax/E come from? I see how you can go from σ=Ε*Σ to σ/Ε=Σ and it was already stated Σ=(-y/c)*Σmax but I don't know(can't see how) the Σmax= σmax/E.
9:38 not sure if this is a stupid question. does that mean the magnitude of the stress above the neutral plane is equal to the stress below the neutral plane. and at 7:04 in my head it seems like it should be Mz = T*Arm +C*Arm?
I never heard it described as the selfish formula (of course i always did Mc/I). and Ayn Rand reference was hilarious! Of course i was also selfishly disappointed because i searched for Residual Stresses in... Even if you part went plastic, we still say plane sections remain plane.
Do you have a video that translates all of this into real-world implications, like wood and steel structure design or conceptual language. I'm thinking of something that discusses the material without using variables as a language? Rather than saying "Sigma is equal to E times Epsilon... Sigma divided by E... equal to minus y divided by c..." To some that sounds like a sentence, to others (myself) it sounds like a foreign language that I need translated without going to a huge variable glossary.
Can you do another video about the flexural strength formula as mention in ASTM C78 (concrete beam) because that's the reason why I came to this video. It says, Flexural Strength = (PxL) / bd³ Where, P is max pressure that works on beam till it fails, L: length of beam, b= base, d= depth. So PxL is Moment right? And what is bd³? Isn't it supposed to be Inertia (Ix) , which is 1/12 bd³?=M/Ix Why there's no 1/12 in that Formula? Thank you very much. And I hope you Understand my question because English is not my language. 🙏🙏🙏
Hi, while calculating how you determine Y should it be measured from top or bottom and why ? in case of symmetrical section its same thing whether you measure from top or bottom but in unsymmetrical section its not the same.
I followed the video pretty good until the part when you mention the Negative Strain? I'm confused about the direction of the arrows you draw. Explanation please?
what if you only know deflection amount, moment of inertia, elastic modulus, length, and cross section (circular cross section) for a simple supported beam on both sides. Force and moment are unknown.
Why is it that Ɛ @ y isn't negative, but the maximum value of Ɛ [@ C] IS negative? If we're defining compressive strain as negative, why is the strain at y [which is above the N.A] not also negative? Thanks
One question, when we calculation the stress, hooke's low can only apply at elastic scope. so for the stress at plastic stage, could you please explain more, because I am thinking the the Sigma along y axis may be not linear
in strain profile ,when we are using similar triangle method to correlate strain at Y and strain max. at C , from where this negative sign came . e and e max both are negative and Y is having same sign as that of C . a bit confusing !!!!
+Eugene Ougo thank you! I love it when our community responds to comments in a positive way. It makes me feel like I'm part of a massive, moving cloud of learning with lightning bolts streaking across the sky and thunder in its wake!
sir why the stress profile and strain profile looks different ...i mean where strain is negative stress is also negative ...should it not be in same crossed curve like stain beside of "K" please help me
Just wondering , if the bending moment is equal to the stress times first moment of area . Why dont we stop here and say that the bending moment is zero. ( I know that its not but just wondering why)
Thanks! this was really helpful. One suggestion: don't talk about the color you're choosing or say BAYAM since it cuts the train of thoughts and makes the information hard to understand. For a video like this it's not necessary to be constantly saying something. Hope this helped.
Hi there ...can you please give me your email id ? I have some questions and examples which I couldn't able to do ...as I am preparing for exam and refereeing to your series of lectures so it will be extremely helpful... Thank you...
3 hour lecture in 30 minutes and 1000 times better!!!!! XD seriously im starting to love a subject i hated! THANK YOU!
less than 30 min if u speed up B)
You've simply encouraged me to continue with engineering with the fun that you had explaining this haha. Thank you so much and God bless
Thank you for the kind words. I believe. Let me know when you graduate!
"You need to crawl before you can ball." - K. West
@@structurefree I'm guessing he probably graduating soon or has already!
oh my.. this was amazing. I specially liked how you opened up the second moment of area. Most of the books just tell you its Iz=int y^2 Da and then some shallow explanation and how you actually calculate it. Thank you so much! I linked this channel to my fellow engineering students.
Thank you much you saved my life. You have explained it better than my instructor waaaaaaaaaay better!
I'm glad I found this channel . Thank you sooo much!
Wow, I really enjoy the videos. You know what, I am so excited that I do not want to go to bed. Wonderful explanations worth great appreciation ！
He explained it so well and in such an amusing way. I really enjoyed learning the flexure formula.
YOU ARE A LEGEND!! I WON'T EVER ATTEND MY CLASSES AGAIN.
the negative strain denotes the compression side of the beam. I chose to say that negative strain is to the right and positive strain is to the left in order to match the deformed shape. Instead of arrows, it might be better to just think of strain values at each point along the section of the beam.
You deserve a gold medal🏅 in teaching!
i like your attitude and the way you explain it is top notch also your neatness helps thanks for all that you do man
Love for your simple explanations Allah will give you more success .🎓
This is just PERFECT !
You have a great way to do it . Keep it up :D
Damn , unstucking feels so good . Really like it!
I have just come out of a 2 our lecture with no clue what was going on. Even with this sped up to 1.5x I have learned more here.. Thanks :)
Thank you very much , I'm taking this class in Germany and woow you just made it so easy to understand
Thank you very much. I'm having my last bachelor's degree exam tomorrow and these videos of yours are being super helpful. (If I may, you say BAM way too much! I would save it for the final formula only)
..your lecture truly the bring understanding of the foundation
keep it up and thanks my carrer will surely will get a boost with these
Thank you so much man! This was really helpful! :D
+Akarsh Sonni you're welcome!
Thanks lecture , greetings from Turkey . Very good expression
still watching in 2013. keep on going !
Pirate Hooke.. You are great man :)
thanks for watching!
Thank you very much, Clearly Explained....
You are a super hero.
thanks !!!
this video did help me understand. Great job :)
sir u are a life saver :) thank u so very much... that selfish equation thing is awesome (Y)
hello, i would just like to ask why did the strain(max) was changed into stress(max) during the derivation of normal stress by substituting it in hooke's law in 4:17 of your vid. i'm confused. please help me.
At 4:25 where does the σmax/E come from? I see how you can go from σ=Ε*Σ to σ/Ε=Σ and it was already stated Σ=(-y/c)*Σmax but I don't know(can't see how) the Σmax= σmax/E.
very attractive explanation about selfishness formula ' stress = -my/i '
this is really awesome!!! love this video ~! save my day!! exam in2 days ~ this really really really helped :D
9:38 not sure if this is a stupid question. does that mean the magnitude of the stress above the neutral plane is equal to the stress below the neutral plane. and at 7:04 in my head it seems like it should be Mz = T*Arm +C*Arm?
Thanks alot. Saves alot of time. do you have any example problem?
I never heard it described as the selfish formula (of course i always did Mc/I). and Ayn Rand reference was hilarious! Of course i was also selfishly disappointed because i searched for Residual Stresses in... Even if you part went plastic, we still say plane sections remain plane.
thank you so much sir!
thank you very much .. that explained a lot of stuck things .. keep going (Y)
You are welcome. Awww yeah for unstucking!
hhhhh (Y)
Awesome teaching capablity
at 5:22 why is the direction of stress towards the cross section?
why are the stress vectors not in the same direction as the strain ?
Perfect !!thank you very much
Do you have a video that translates all of this into real-world implications, like wood and steel structure design or conceptual language. I'm thinking of something that discusses the material without using variables as a language? Rather than saying "Sigma is equal to E times Epsilon... Sigma divided by E... equal to minus y divided by c..." To some that sounds like a sentence, to others (myself) it sounds like a foreign language that I need translated without going to a huge variable glossary.
very good video
i cracked up when you described that formula as selfish :))
big help dude tysm!!! ❤
Can you do another video about the flexural strength formula as mention in ASTM C78 (concrete beam) because that's the reason why I came to this video.
It says, Flexural Strength = (PxL) / bd³
Where, P is max pressure that works on beam till it fails, L: length of beam, b= base, d= depth.
So PxL is Moment right?
And what is bd³? Isn't it supposed to be Inertia (Ix) , which is 1/12 bd³?=M/Ix
Why there's no 1/12 in that Formula?
Thank you very much. And I hope you Understand my question because English is not my language. 🙏🙏🙏
i lost at 4:25 , why did modulus E cancel out? and why epsilon max is changed to sigma max? im confused
Hooke's Law. Captain Hooke...arrrgh!! Yo-ho, yo-ho, yo-ho, it's a pirate's life for me.
Awts hahah
Thanks for explaining! Very useful video! Can you tell what kind of program do you use for drawing? Is it paint?
For a weirder cross-section beam (asymmetrical), will the strain-profile triangles you drew no longer be the same? (share a similar angle) Thanks
'My'nus the rant it's good
Hi, while calculating how you determine Y should it be measured from top or bottom and why ? in case of symmetrical section its same thing whether you measure from top or bottom but in unsymmetrical section its not the same.
Thanks!
I followed the video pretty good until the part when you mention the Negative Strain? I'm confused about the direction of the arrows you draw. Explanation please?
what if you only know deflection amount, moment of inertia, elastic modulus, length, and cross section (circular cross section) for a simple supported beam on both sides.
Force and moment are unknown.
Why is it that Ɛ @ y isn't negative, but the maximum value of Ɛ [@ C] IS negative? If we're defining compressive strain as negative, why is the strain at y [which is above the N.A] not also negative? Thanks
One question, when we calculation the stress, hooke's low can only apply at elastic scope. so for the stress at plastic stage, could you please explain more, because I am thinking the the Sigma along y axis may be not linear
we assume we are in the elastic region (linear region) where you can apply hooks formula. And we don't talk about plastic region
Thank u so much
Thank U !
I always think of captain Hook, I dont know why.. Har Har Har.
Lol, Wonderful :)
P.s. that is not the only thing i learned in this video! haha
in strain profile ,when we are using similar triangle method to correlate strain at Y and strain max. at C , from where this negative sign came . e and e max both are negative and Y is having same sign as that of C . a bit confusing !!!!
+Dohendra Dubey Check out the first part of the video more keenly you will understand where the negative is coming from.
+Eugene Ougo thank you! I love it when our community responds to comments in a positive way. It makes me feel like I'm part of a massive, moving cloud of learning with lightning bolts streaking across the sky and thunder in its wake!
+structurefree I dont understand why E isn't negataive and Emax is. Is it because E = -y/p and y is positive so you will get E?
because e is general and e max is negative due to change in length of section due to compressive force
negative stress should be -> , right ? 5.09
sir why the stress profile and strain profile looks different ...i mean where strain is negative stress is also negative ...should it not be in same crossed curve like stain beside of "K" please help me
garima shama he has shown that by arrow , right for tensile
how could i determine the value of y ?
Just wondering , if the bending moment is equal to the stress times first moment of area . Why dont we stop here and say that the bending moment is zero. ( I know that its not but just wondering why)
Ahh I think I figured it out , is it cause stress is not a constant but stress max is ?
I LOVE YOU
Thnx bro
damn you should be my prof
+BENCH MARKING that would be fun.
selfish equation... heahehaeha
i will never forget this
Why the summation of force of x section is
∑F=0
integral sigma da
I don't understand what is meant by integral sigma da
helpful
So, The view is not a section, but an elevation? what?
Hahaha lol you rock man :D "the most selfish formula"
Bammm it's great.😆😆
I can't believe it was 3-D the whole time.
😁
I'm a big Ayn Rand fan.
SELFISH EQUATION........
It's Ayn Rand's favorite.
imma remember this forever
the most selfish equation in the world
Aww yeah!! Of course the next question...is selfishness negative? Hmmmm.....
4:00 loool
cool, didn't know being 'stress'ful is being selfish
Thanks! this was really helpful. One suggestion: don't talk about the color you're choosing or say BAYAM since it cuts the train of thoughts and makes the information hard to understand. For a video like this it's not necessary to be constantly saying something. Hope this helped.
I like when he does it. It makes the learning seem more natural and less scripted. STRUCTUREFREEEEE
Hi there ...can you please give me your email id ? I have some questions and examples which I couldn't able to do ...as I am preparing for exam and refereeing to your series of lectures so it will be extremely helpful... Thank you...
Selfish formula LOL
selfish equation HAHAHAHHA
stop saying "baaaam" ....... irritating