Stress/strain+general bending equation

[ar202]

Stress/strain+general bending equation...

Homework Statement

A steel strip is to be bent around a drum of radius 1m. What is the maximum thickness of strip that can be bent in this way if the stress in the strip is not to exceed 100 MPa.

The steel has a modulus of elasticity of 210 GPa.

Am i correct in thinking i should be using the general bending equation here?

as well as the second moment of area for a cylinder?

pi x d^4/64

any help would be great, cheers.

Homework Equations

The Attempt at a Solution

I'm stuck on where to begin, a nod in the direction would be really helpful thanks.

 

[rock.freak667]

I think that would be correct to do.

 

[ar202]

1 x 10⁶ / 2.1 x 10¹¹ = 4.76 x 10^-4 ...?

 

[rock.freak667]

1 x 10⁶ / 2.1 x 10¹¹ = 4.76 x 10^-4 ...?

I am not sure what those numbers are supposed to mean.

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

Which equality did you use?