# How do I calculate the extension and strain at peak load?

1. Aug 19, 2016

### ipocoyo

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

If a question gives us a max load with different extensions, how do I calculate the strain?

For example:

1900KN=x mm
1900KN=x mm
2000KN=x mm
2000KN=x mm
2000KN=x mm
1900KN=x mm
1900KN=x mm

2. Relevant equations

strain= ΔL / L

3. The attempt at a solution

What I think is perhaps taking the average extension x? Is this correct? And afterwards taking x avg/ L?

2. Aug 19, 2016

### BvU

Hi,

Not a very specific/clear question. Would the max load be 2 MegaNewton ?
If you have the $\Delta x$ and the $\Delta F$, you have the slope of the stress/strain curve, don't you ?
You do want to check that you are in the linear range, but perhaps that's assured by the term 'max load'.