As we discussed in class today, here are some news and notes about the final exam:
- Thursday May 1, 2-5 pm, in MEC 205; bring a calculator, pencil, eraser, batteries
- you are allowed 1 sheet of 8.5 x 11 paper, both sides, for exam-related information (I will supply Appendix C if needed)
- coverage: everything from the first two exams, plus Sec. 8.2, all of Ch. 9 EXCEPT Sec. 9.6, NO Ch. 10, and ONLY superposition approaches from Ch. 12 (Sec. 12.5 and 12.9)
- office hours: W 8.30-10, Th 12-1
- wiki link is here; it will come down on Thursday
If you have any questions, especially administrative-type questions, add them to the comment thread on this post.
14 responses so far ↓
1 John // Apr 29, 2008 at 5:32 pm
Professor Berger,
In regards to Principal (Normal) Stresses, will we need to use Mohr’s circle to solve problems or will be able to simply use that sigma 1,2 equation?
2 John // Apr 29, 2008 at 6:27 pm
Could we also get the last few solutions to the homeworks posted on toolkit?
3 Susann // Apr 30, 2008 at 8:43 am
Professor Berger,
Could you please post the solutions to the homework problems from chapter 9?
Thanks,
Susann
4 berger // Apr 30, 2008 at 9:09 am
For Ch. 9, you may be asked to draw the circle. For instance, remember that we talked a good bit about the nature of the circle, the signs of the principal stresses, etc. So be ready to interpret Mohr’s circle in terms of these things.
I have asked Sakya to post the HW solutions in Toolkit and he will do that today…
5 oxymoronl0ser // Apr 30, 2008 at 2:35 pm
Did anyone find the solutions to Exam 2 posted on the blog? I didn’t see the link for it.
6 kls2ycc // Apr 30, 2008 at 2:44 pm
As far as graphing is concerned, besides sheer and moment diagrams, will we be asked to draw any of the stresses or such like you typically do when in class showing the direction and magnitude of them ?
7 kls2ycc // Apr 30, 2008 at 2:47 pm
als0, if we need the moment of inertia for anything besides a rectangle will that be given or do we need to know the equation?
8 Susann // Apr 30, 2008 at 3:08 pm
oxymoronloser, the solutions to exam 2 were emailed to us a couple of days ago. i would check your inbox.
9 oxymoronl0ser // Apr 30, 2008 at 3:37 pm
Thanks Susann
10 Philip // Apr 30, 2008 at 4:31 pm
kls2ycc,
I don’t know whether he will include it or not, but MOI was on the last exam. It’s really quite simple, though.
The equation is
I = SUM[b*(h^3) + A*(d^2)].
Where b and h are the width and height of the rectangular sub-piece of your beam, A is b*h, and d is the distance of that piece’s centroid from the whole structure’s centroid. Iterate over all the sub-rectangles of your structure.
I usually write the formula on my equations sheet just in case, but IMO it’s not a bad idea to have it committed to memory regardless of whether it’ll be on the exam.
11 mdk7q // Apr 30, 2008 at 5:38 pm
its actually b * h cubed over 12 not b * h cubed
12 Philip // Apr 30, 2008 at 5:56 pm
You are right, Mdk7q. I missed the 1/12.
I = SUM[b*(h^3)/12 + A*(d^2)]
iterate over all rectangles in your cross section
13 cmm8kb // Apr 30, 2008 at 8:53 pm
Are statically indeterminate deflection problems with superposition from chapter 12 going to be on the exam? Or just the straight forward beam deflection from 12.5?
14 berger // Apr 30, 2008 at 11:19 pm
Lots of questions…uh, well, the idea of graphing things like stress states on a differential element is completely fair game. It’s the crux of Ch. 8.
For moments of inertia, you’ve got plenty of formula sheet room, so there’s no good reason not to write down the key useful equations from the inside front cover of the book.
For beam deflections, just read the post: it clearly says Sec. 12.5 AND 12.9.
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