# Average true stress

1. Dec 7, 2008

### Jason03

Im working on a problem that I need to find the Average true stress....Im using a true stress curve for annealed copper....and I found the true stress in the unstrained condition to be 12,000 psi.....and I found the true stress in the strained condition by using the equation:

strain = ln(l/l_o) which gave me .916....I than used the strain of 916 on the x-axis to find the true stress in the strained condition.(72,000 psi).....Im trying to remember how to find the average of the two values since I cant just add and divide by two since the graph is not a straight line......

Last edited: Dec 7, 2008
2. Dec 8, 2008

### Jason03

How would I find the area under the curve when I only have two points?