Mechanics of Materials: Lesson 31 - The Flexure Formula, Beam Bending Example
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- เผยแพร่เมื่อ 16 ก.ค. 2020
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you are a combination of a cool dad and a great teacher
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my textbook did nothing for me this week. Read it and had zero idea what was going on. These videos are a life saver!
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Wonderful solids lessons!! really taking the time to explain the problems along with a good sense of humor :))
Our professor is making us teach ourselves Mech of Mat, thank you so much for this.
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Thank you I’m reviewing this for my mechanical design class
For the middle calculation for Ix' I got [(1/12)(7)(1)^3]+7(2.65^2)= 49.74. Am I doing something wrong?
I think Jeff made a mistake there. You did it right.
Yeah, I believe it was just a simple algebra mistake. Thank God computers do the algebra for us in the field.
Yeah he just made a mistake and got 7 instead of 10.5 you are correct sir
The whole time I looked at the beam section as if it is a side profile and so it never made sense to me.
You are literally the only one that explained (with your hands) how the moment acts on the beam, and now all makes so much sense.
Out of all my course mates (about 240 people) nobody knows this. Bad students or a bad teacher?
Nevertheless, I you have thanks!
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Thank You! Hopefully this helps on my exam
I need help with regular stresses, shear and cornering, and the transfer of regular or clipping force from the permissible to his cross section. Thank you.
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I_2 = (7(1)^3)/12 + 7(10.5-7.85)^2 = 49.74in^4. Yes, In the video it appears that he makes an Algebra Error. for the Final Answers when done correctly I am getting: NetI= 235.13in^4, N.A.= 7.85in., Max Tension = 1.60 ksi, Max Compression = 0.64 Ksi.
yh u right
Thank you so much
You’re right
yep I noticed this as well
Ty
Thank You!
sir for Inertia of Area 2, it should be 49.74 in^4...
yes I agree
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Wise old man.
How do you know which side is in compression or in tension, I cannot visualize it
Material towards the bottom has to get longer as the surface is stretched due to the direction of the moment applied thus in tension. Material towards the top is being squeezed together due to the direction of the moment thus compressive.
شكرآ
Why does the end blur out and the sound go away?
T-beam, what is the Top (Tension) and bottom (compression) will be if we bend the shape in an opposite direction downwards, not upward as illustrated?
yes
sir ,for bar 3 & 4 is it not y=10 inches ?
yeah it should be
The height from the base to the top is 11 inches, and the centriod of parts 3,4 is 1.5 so 11-1.5=9.5
2:41 for cat meow
** one of the Ixx answers is wrong. 62.87 should be 49.7
shouldn't compression stress be -.609 ksi? not positive
Labeling it as compressive is equivalent to using a negative sign. So if you labeled it as compressive and used a negative sign that would actually mean positive (tensile). I hope this helps
While he is calculating the second line of Ix', he pressed on his calculator the buttons 9 then 8 for 2.98^2 instead of pressing 6 then 5 for 2.65^2 that is simply what happened with him.
why doesn't d come out negative in a*d^2? pretty sure 7.85-10.5 comes out negative
yes but a square always results positive
You'd have to reconsider your degree if you're disliking these videos.
can centroid be smaller than the y
Not sure what you are asking here?
there is a mistake, it is 49.74 not 62.87.
Your answer is wrong
Thank you Jeff.