bending stress in plate
 

bending stress in plate
i am designing a plate that is fixed at both sides, the bottom, and free on the top.
i took this equation out of rorkes formulas for stress and strain--- sigma= -beta*q*b^2/t^2--- where beta is dependent on the length of the plate divided by the heighth.
i found that the sigma max (flexural stress) was 113.5 psi. is this the maximum stress that can occur on the plate? and is this per unit length of the wall or per area of the wall?
check out our whitepaper library.
this should be the max stress, not per unit length, just the max stress. this is a very conservative design because you can get 6 yield lines to form.
roark has different beta constants for different positions on the plate ... if you check them all you should be ok.
be careful with roark's plate tables. they don't always give maximum values. see
try the first site below (plates -> simple bending -> rectangular -> 3 clamped, 1 free or 3 supp.,1 free) and compare the results with roark.
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