roarks formula confusion 5

[greycloud]

Greatings everyone

I'm trying to get how roark in his book "formulas for stress and strain" got the stress equation for bending stresses in rectangular plates.

I noticed that the equation is composed of the moment formula divided by just T^2 so how did he arrive at this result.

I hope you can help me resolve this mystery.

Thanks in advance

 

[BAretired]

Thanks Doug, I think I'm beginning to see it more clearly now.

BA