Throwing more dollars at a broken health care system

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Another example: Medical guidelines recommend that patients with stable coronary artery disease undergo an exercise stress test to confirm a restriction in ...

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Stress Triggers Insomnia National Sleep Foundation has published useful information for those who can t get asleep at night These recommendations together with our experts advice will hopefully help you This

How do I calculate stress and deflection for a simple beam?
Q. Simply supported on both ends - rectangular cross section, either a single load at mid span, or a continuous distributed load across the whole span - how do I find the max deflection in the middle and the max stress (and the location of the max stress) on the beam? Thanks.
Asked by garbagefan_mil - Tue Jan 20 16:09:17 2009 - - 1 Answers - 0 Comments

A. The maximum stress is calculated from the following relation: sigma = Mc / I where M is the applied moment, c is the distance from the neutral axis (generally you are interested in the maximum stress so this is the distance from the neutral axis to the outer fiber of the beam), and I is the moment of inertia. For a simply supported beam with a concentrated load at mid-span: max moment = W*L / 4 where W is the load & L is the beam length. max deflection = -W*L^3/(48*E*I) where E is Young's modulus For a simply supported beam with a uniform load: max moment = W*L / 8 where W is the uniform load & L is the beam length. max deflection = -5*W*L^3/(384*E*I) where E is Young's modulus In both cases the max moment & max deflection occur at… [cont.]
Answered by Scott H - Tue Jan 20 17:15:32 2009