Sir you are brilliant, I feel sorry for myself because I didn’t discover your channel earlier, 7 years and still more than useful 😍
@structurefree3 жыл бұрын
So nice of you
@structurefree12 жыл бұрын
positive y moments are in the direction your fingers curl when you point your thumb in the +y direction. so the 600*12 rotates in the opposite direction as your fingers, therefore it is negative.
@Virusruneblazer12 жыл бұрын
Thank you so much I have a statics and mechanics final tomorrow morning and you really cleared the air on combined loading! Very clear video
@structurefree11 жыл бұрын
I feel like Yoda - "Life long you must learn. Structurefree your teacher is."
@kjag886 жыл бұрын
structurefree :)
@bonganelebopo26573 жыл бұрын
My bro God bless you. Passed mechanics of materials because of this channel💪💪💪
@gizemozdemir74337 жыл бұрын
Istanbul Technical University Naval Arch. Students want to say thank you for your lessons; we learned mechanics thanks to you.
@AFLfan10009 жыл бұрын
You are the best, so funny and just such a great teacher. 3D combined loading was lost on me until I discovered this! All the other videos are amazing too!
@abdelrahmantallis9293 жыл бұрын
You are just too good man. Keep it up! Been struggling with it for 2 days now, watched the first 8 minutes and Im good to go
@lawrencemiller181111 жыл бұрын
"It's normal. Just like me!" Hahaha. That part got me laughing. thanks for the extreme help!
@izharullah204511 жыл бұрын
You are amazing...teacher love u...i wanna be ur student forever...so intresting ur lectures are
@cxh9707128 жыл бұрын
Don't know if you still read the comments but thank you so much!! Solid mechanics was a total nightmare for me until i watched your playlist of videos and i feel just a bit more confident about doing my exam next friday! Thank you and keep up the great work! :D
@rivoobagchi52452 жыл бұрын
literal lifesaver. thank you so much
@mohamadhasrulrezamohdhisha87989 жыл бұрын
Thanks man. Your tutorial saved my life
@ashrafsalehuddin11549 жыл бұрын
+Mohamad Hasrul Reza Mohd HIsham ajar aq la pulak..hahaha
@mohamadhasrulrezamohdhisha87989 жыл бұрын
senang je lah. aku dah ajaq wan
@engradnanrasheedmechanical Жыл бұрын
Good job keep it up
@isopropyl758211 жыл бұрын
You sound like you're stoned in this video. But I don't care because you helped me a lot not to mention your sense of humor that my professor doesn't have.
@okanoguz330910 жыл бұрын
You are the best teacher I have ever listened :)) I passsed my strength of materials 1 course thanks to u !! And Hope I will pass strength of materials 2 course, too :)) I just wanted to say thank you so much,. And u should go on to make some jokes during the video.. Coz It makes me laugh :))
@structurefree10 жыл бұрын
Thank you for the kind words. I'm actually more flattered that you think I'm funny. Congratulations on all your success!
@ozoozo330110 жыл бұрын
Gemiden AA la geçmen lazım bu dersi
@structurefree12 жыл бұрын
i'm glad it helps.
@structurefree12 жыл бұрын
@Panth Naik as long as you also calculate the internal moments and torque at the cut, you will get the same result. It is not really superposition that is being applied, rather the six equilibrium equations.
@xolelankomo82859 жыл бұрын
writing my mechanics of materials exam tomorrow,feeling confident thanks to you bro!
@박찬우-h8n4 жыл бұрын
Amazing!!, i finally realize it thanks to you 👍
@Ray-oo6rj9 жыл бұрын
Thank you so much for this video,one week before my exam, lifesaver :D
@theengineeringlife9451 Жыл бұрын
Thank you for the great video sir, how do we know when to use the correct shear vs stress equations. For example, for Ny, how do we know that normal stress is N/A and not Mx/y. Same goes for the shear equations. Also, when do we apply both equation for both stress n strain. Really struggling with this concept
@DarthYoungling11 жыл бұрын
I love your videos. If I need to look up something and I see it is one of ypur cideos
@elaysiasimms88822 жыл бұрын
how did you compute the moment forces about point z? im not understanding how you know to multiple for that particular axis.
@Samcanplaymusic6 жыл бұрын
Dude, you explain so clearly.
@notSavant7 жыл бұрын
Can you explain the reason why you chose those interanl loads in the begining?
@El_inge_9879 жыл бұрын
Awesome review prior to my midterm.
@911Teresa9119 жыл бұрын
How do you know when it was shear stress and when it was normal stress? I know normal has to on with it being perpendicular to the force and shear has to be parallel. So why is Mx in normal stress and not shear? and same with the rest. THank you
@structurefree9 жыл бұрын
911Teresa911 bending moments have a tension and compression force couple which are normal to the surface and cause a normal stress, they also cause elongation and contraction which are associated with normal stress. Twisting moment or torque cause angle changes which are associated to shear stress.
@TJWaterFlows9 жыл бұрын
At 6:40, why is the 600*12 being subtracted, while at 5:45, a positive moment is induced when 600*8 is added to Mx? Thanks in advance - it's a very helpful video.
@DRLED-pd7pu7 жыл бұрын
For anybody reading this. He messed up sign convention here. Use Right Hand Rule
@jkgao976 жыл бұрын
I mean, as long as he sticks with that convention, it's alright.
@RH2022A2 жыл бұрын
Love you man
@gkrozr96 жыл бұрын
12:25 Can you please explain why you took this area, wasn't Q above or below
@omarzain60506 жыл бұрын
Gkrozr Vx.Qz/Iz so he uses the left or right area but if it was Vz.Qx/Ix he will use the upper or Lower area
@gkrozr96 жыл бұрын
Omar Zain Thank you.Appreciated :)
@adlee07058 жыл бұрын
Normal, just like me! haha, make me laugh so loud. Btw, great explanation!
@structurefree8 жыл бұрын
+Adlee Jaafar ha ha ha! just reading it makes me laugh. why is mechanics so much fun!
@hilmijohari48218 жыл бұрын
Omg Adlee. ermm Hi!
@magdkhalid83667 жыл бұрын
structurefree
@abdurrahmannocomment72692 жыл бұрын
Thank you very much
@ΔημητρηςΒροχαρης4 жыл бұрын
As far as i am concerned , there are no shear stresses at the periphery , the shear stress profile is parabolic.
@ΔημητρηςΒροχαρης4 жыл бұрын
@@lwthorn1977 yeah probably otherwise the solution has gone wrong .. anyways , most times shear stress can be omitted due to their small contribution to the result and the percentage of this fault comes to a 2 or 3 percent ... actually most times i use tresca or vonmises criterion and it doesnt bother me somuch
@dwkrnpl8 жыл бұрын
why is it shear stress and not normal stress? can you explain how to distinguish(pick) what type of stress it is
@floormatt38 жыл бұрын
+deepak np remember that shear is across a surface, normal is into a surface. So if you look at the force of y in this example, it goes into the surface therefor it is normal stress. If you look at force of x, it goes sideways, therefor it will cause shearing.
@ItsTopCat7 жыл бұрын
floormatt3 omg ty so much!
@massimobaldini59127 жыл бұрын
You just saved a very frustrated student!
@lildefa7 жыл бұрын
If you've got normal force in Y direction, wouldn't it be torsion instead of moment about that axis?
@FCB106811 жыл бұрын
Which one off your videos do you recommend i apply for the lift arm of a Skid steer loader connected to the chasis at one end and connected by pivot to a bucket with load at the other end
@amatoallahouchen58942 жыл бұрын
thank you for the amazing video, should not the shear stress on point B( on the surface) be zeo because shear is caused by forces between layers! thank you!
@caseyliao91887 жыл бұрын
You are a life saver, Thank you every much!
@IMrajnishsingh9 жыл бұрын
There should be a torque at the cross-section about y axis due to the 600 lb force or am I wrong?
@structurefree9 жыл бұрын
+Rajnish Singh Yes, there is. It is labeled as My in this problem.
@IMrajnishsingh9 жыл бұрын
+structurefree Thanks for the clarification.Your videos are super useful,I am currently revising this subject using your channel,its a big help,keep being AWESOME.....chika chika..haha
@de-SportsHub8 жыл бұрын
you say compression, normal or shear but you failed to explain why those points/faces are experiencing such forces.
@theskijunkie6 жыл бұрын
If you view his other prequel videos, all of that is explained.
@Mrjrphoen9 жыл бұрын
Your lectures are excellent chief. I thought 1st moment of area, Q, for V_x should be all area below pt. B or above pt. B as mentioned on the earlier 2D example, so shouldn't be the whole circle instead of half?
@structurefree9 жыл бұрын
It is relative to the direction of the internal shear force you are looking at. Thank you for the kind words! Good luck with school!
@DarthYoungling11 жыл бұрын
Your videos, I physically smile... Comment fail.
@maccole697 жыл бұрын
I like this guy
@nicolef45523 жыл бұрын
For part 3, when you find the normal force due to Mx, how did you know it was a normal force and that it compresses point b. I just cant quite visualize this piece. Thank you
@bzq33863 жыл бұрын
Visualize it as a beam bending. The moment about the x-axis is due to the 600lb force. Its causing compression at the top (where point b is) and tension at the bottom. In simple words visualize this as a smiley face. Top in compression and bottom in tension. Hope this helps.
@nicolef45523 жыл бұрын
@@bzq3386 Thank you! This helped me realize to look at it in its entirety, not just the cross-section. Because if you think about the rotation the 600 lb force will cause, it will go through the plane of the cross-section. Thank you again
@bzq33863 жыл бұрын
@@nicolef4552 Welcome!
@aga0804 жыл бұрын
thank you
@kamals49058 жыл бұрын
is that possible to add(combine) two mechanical force(torque) Ex:- if i have two 1.5v batterys >> - if i connect in series the voltage increase OR - if i connect in parallel current rating is increase same as in mechanically either rpm increase or torque increase i dont know is that good question or silly one........hahahah but please replay me if you have any suggestion
@brianwin51834 жыл бұрын
Thank you.
@gokujoseph11808 жыл бұрын
how do you calculate the moment equations. can you explain how to do it. i can do it in two -d but i cant wrap my head around how you do it in 3d
@silentprayers7282 жыл бұрын
I'm more interested in drawing an infinitesimal element cube with arrows for axial, bending, transverse shear, and torsional shear. A problem that is more conceptual, drawing at different cross sections at different points (ex. top of cross section, side of cross section, etc.)
@structurefree2 жыл бұрын
Good idea!
@structurefree12 жыл бұрын
yes.
@lisro2110 жыл бұрын
Man you are saving my ass.
@ahmedalawsy94855 жыл бұрын
Last minute life saving
@MrZiiiro11 жыл бұрын
Great teacher ! very helpful videos..
@structurefree11 жыл бұрын
Thank you! You are too kind.
@DailYxDosE6 жыл бұрын
12:48 what is Q the left shaded half of the circle and not the half circle above Vx?
@mysticflickr73489 жыл бұрын
Hi, Actually what to do when the cross section is of Hexagon and not circular. I have an assignment of allen wrench in which we need to follow combined stress method to check the convergence between hypermesh and Mechanics of material results. I can send the pic of problem if i get an email id if you provide. or anyone who can help with the topic
@eduardourbano39673 жыл бұрын
What is the book used? Idk what is the whole question.
@benjaminshiflett80664 жыл бұрын
wouldnt Vx be 0 at B due to its distribution? max at neutral axis and 0 at edges?
@zhengyangsong6 жыл бұрын
Many thanks in advance!!!!!!
@FawazBnMohammed7 жыл бұрын
12:25 explain why you took this area, you said before Q is above or below i hate it when this happens
@othescientist8 жыл бұрын
Shouldn't all of your signs be flipped if you are considering the stresses at B resulting from the applied forces? i.e. You are finding the internal forces and moments that balance out these forces, but you're considering the left side of the cut when your proper sign convention would result from considering the right side of the cut. Gnomesayin?
@floormatt38 жыл бұрын
+Fricks and Fracks No, when you write out your equilibrium equations you will find this. In this example, when finding Vx, you would write out the equilibrium equation as follow: Fy = 0 = Vx - 500 => Vx = 500. This Vx is headed the opposite direction, and therefor balancing like you say. There is no need to switch the signs once you've found your forces.
@yangli364511 жыл бұрын
it is really helpful.BTW, what software are u using?
@NoorFarhat7 жыл бұрын
Is there no continuation of the video? Awesome part 1!
@notSavant7 жыл бұрын
Is the formula you use for the shear stress not for other shapes?
@shawnnjh9 жыл бұрын
Is there a confusion between moment and torsion? The way i see it, for the x-axis: 600*8 is the torsion while 600&12 is the moment, please clarify.
@floormatt38 жыл бұрын
+Shawn Ng No, the torsion happens along the normal axis. Basically, if you draw out your cuts like he did the torsion should make a clockwise/counterclockwise arrow. In this example, that only happens along the y-axis and not the z- or x-axis.
@patrykmuter288 жыл бұрын
fantastic material my homies
@panth9212 жыл бұрын
Quick question , at the beginning of the problems why did you not superposition the applied forces to the cross section at b. Hence giving vx=-500,vz=600, and ny=800, then going from there. Thats what my textbook does, they just take the applied force and put it onto the cross section of where we are looking at. Does your method and my method give the same result in the end?
@diao111111 жыл бұрын
Hi there, can you evaluate more on the Moment equilibrium equations as I cant quite get my head around that. Why is Moment about x only caused by the 600 lb? and for moments about y and z respectively
@joshuagerman770111 жыл бұрын
Do you have a site or channel with mechanics of aerostructures video lectures. very similar to this
@structurefree11 жыл бұрын
what topics are you looking for? fiber reinforced polymer composite mechanics?
@joshuagerman857911 жыл бұрын
structurefree here are a list of the topics am looking for www.colorado.edu/engineering/CAS/courses.d/Structures.d/
@structurefree11 жыл бұрын
I cover some of the strain/stress concepts, torsion, and beam deflections in my mechanics of materials playlist. Unfortunately, I have yet to add the other topics...I'll add them to my to do list.
@joshuagerman857911 жыл бұрын
Thanks. I ll appreciate that so much
@panth9212 жыл бұрын
Will the sign of the compressive or tensile force not be different at the cross section giving you a different normal force number for that cross section?
@charlesbobby70925 жыл бұрын
Why do we only care about the x axis and y axis, as opposed to all 3 (including the z)?
@einstienalbert51467 жыл бұрын
Hello, Can anyone please help me in understanding ,How to take moment about any axis?
@nilufargh8 жыл бұрын
Thank you so much! but why did you consider only half of the circle to find Q?
@aliabbas21385 жыл бұрын
i also cant understand that part can you make me understand it
@osamawali10982 жыл бұрын
@@aliabbas2138 q is calculated for only one side of the point for which you are calculating the shear which is the shear formula requirment
@gregmiller81357 жыл бұрын
Ive spent a lot of time on trying to understand internal loadings, and I want to know why you ignore equilibrium sometimes. Why do you have a negative normal force? I feel like that isn't possible. I also feel like a negative moment reaction is impossible. Can someone clarify?
@leeshanpillay12537 жыл бұрын
It is not impossible. It is negative because it has to counteract the other forces in the positive direction to reach equilibrium. I dont understand how to take moments in 3D any suggestions?
@kimDONDE4 ай бұрын
how to identify moment -600(12) or +600(12)?
@nickknauer1512 жыл бұрын
When you are solving for My, why are you subtracting 600(12)?
@goldilauks9 жыл бұрын
I wish you were my teacher.
@aurey9977 жыл бұрын
12:59 why is that half of the circle??
@nickknauer1512 жыл бұрын
Thanks, very helpful
@3dprintkkstudio7 жыл бұрын
why Q only take half of the area of circle?
@osamawali10982 жыл бұрын
its torque about y axis not moment right?
@ahmedmusa5174 жыл бұрын
I did not understand why you take only one moment due to forces for x and y-axis. And 2 moments for the z-axis. since we have 3 forces in 3 directions that imply each axis should also have 2 moments due to forces
@jasonlatimer5510 жыл бұрын
This guy is hilarious.
@yamikawaii3216 жыл бұрын
Why Vx induce shear stress at B not at A?
@juliangarcia34165 жыл бұрын
Why 600lb induces a moment in x directrion?
@xalamukanibaloyi15008 жыл бұрын
very helpful
@xhuliomyftari80394 жыл бұрын
Isn't the 600 lb producing a Torque?
@panth9212 жыл бұрын
Wait I think I understand now. My signs are basically opposite then yours , but they should give me the same answer. While my compressive normal force is positive, yours is negative, and while my moments are positive or negative , yours are the opposite sign. But they should give me the same answer, is that correct?
@jadfahed79919 жыл бұрын
Love u bro u saved me
@NinjaNicX5 жыл бұрын
Thank you so much!
@TeamLakers244 жыл бұрын
OMG...goddamn memories lane. Just graduated...n idk how i survived through all this.
@thebluestbelly4 жыл бұрын
thanks man you saved my ass
@theadel85914 жыл бұрын
you forgot to include the shear stress at point B due to the torque (moment about y-axis in this example).
@DeenQuery7 жыл бұрын
great stuff; you're awesome :-D
@osiksama5 жыл бұрын
tqvm sir..
@momoCOM12310 жыл бұрын
Hahahaha ,, I like how you laugh and thanks for this helpful lecture
@Smallsizecheesefries5 жыл бұрын
600 * 12 should be torque not moment??
@hzeeq986 жыл бұрын
how to know whether to put minus or plus sign for moment eq????? pls someone help meeeeeeeeeeee