# Stress/strain+general bending equation

1. May 14, 2010

### ar202

Stress/strain+general bending equation....

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

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.

2. Relevant equations

3. The attempt at a solution

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

2. May 14, 2010

### rock.freak667

Re: Stress/strain+general bending equation....

I think that would be correct to do.

3. May 14, 2010

### ar202

Re: Stress/strain+general bending equation....

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

4. May 14, 2010

### rock.freak667

Re: Stress/strain+general bending equation....

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?

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