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Where does "12" come from in bending stress fomula

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ZHWIL28

ZHWIL28

Mechanical
Jun 13, 2003
20
CA
I am wondering what is the meaning of "12" in the equation of bending stress for pressure vessels. S=12M/(I/c)
In the usual stress fomula, only M/(I/c). Is it safety factor?
Thanks to make me clear!
 
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ZHWIL28-

You didn't include units in the formula. I think what you have is a moment calculated in foot-lb and converted to in-lb (12 inches per foot) in the stress calc.

jt
 
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ZHWIL28,
As stated by jte you must either state Code used or the units of the equation.
 
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Thanks, It is a shame not to take care of units.
 
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