Homework Help: Bending stress + bending moment

1. May 15, 2010

ar202

1. The problem statement, all variables and given/known data

A steel strip of breadth 50 mm and depth 3 mm needs to be bent around a drum of diameter 4 m. What bending moment is required and what will be the maximum stress produced? The modulus of elasticity of the steel is 210 GPa

2. Relevant equations

$$\frac{M}{I} = \frac{\sigma _b}{y} = \frac{E}{R}$$

3. The attempt at a solution

I'm able to find the bending moment by finding the second moment of area...

1.05 x1011 x 1.125 x10-10 = 11.8 Nm

however i'm stuck on how to then go on and find the maximum stress

2. May 15, 2010

PhanthomJay

You have already noted the formula that bending stress = My/I.......you just need to identify the value for 'y' where the bending stress is at its maximum.