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prex's latest activity
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prex replied to the thread Interesting ponding/deflection problem.Sorry guys, my bad, I'm decidedly too old to come back to differential equations. Anyway a solution to the equation ΔIV=(Bgγ/EI)Δ ...
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prex replied to the thread Interesting ponding/deflection problem.If you consider a beam (so not a plate) in bending, then your equation (d4Δ/dx4)=(Bγ/EI)Δ(x) is correct, but the solution is not in the...
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prex replied to the thread Interesting ponding/deflection problem.Not sure to understand your setup: in (1) you show the plate/membrane held (supported and held, I suppose) in only one direction. If...
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prex replied to the thread Stacking an object.IMO this problem is the same as the one for the stability of a column under its own weight. In fact, as long as the (equal) objects...
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prex replied to the thread Theoretical Question - Planar Truss Problem.There's a quite simple proof of the original problem statement. As this proof is based on simmetry, it proves also that the same...
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prex replied to the thread Calculating welds - Second moment of area.The second moment of area, as the word iteself says, is area x distance squared. Pls post this kind of questions in the students forum
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prex replied to the thread Thick Walled Cylinder Question.sigma_theta+sigma_r is not almost constant, it is exactly constant. To me the elongation due to end pressure only is 30 in, the...
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prex replied to the thread Thick Walled Cylinder Question.If you look at your equations, you'll find that sigmatheta+sigmar=const, so the longitudinal elongation (negative, it is a contraction)...
