Strain and force

1. Oct 2, 2009

Ry122

If I know only the length of the beam, the young's modulus, and the cross sectional area, is there an equation that I can use to determine what amount of force would be required to lengthen a beam by a specified amount? The force is being applied to the beam axially.

2. Oct 2, 2009

FredGarvin

$$\delta = \frac{PL}{AE}$$

3. Oct 3, 2009

Ry122

$$\P = \frac{deltaAE}{L}$$

Using this with
delta=.4421207mm
E=200,000MPA
A=5776mm
L=701mm
The force is 728584640N
Doesn't this seem like too much?

4. Oct 3, 2009

FredGarvin

Check your units. Convert all of the mm to m.

5. Oct 3, 2009

Ry122

That's what I did. mm have prefix 10^-3
and Mega pascals has 10^6