Finding Avg. True Stress for Annealed Copper

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To find the average true stress for annealed copper, the user has identified true stress values of 12,000 psi in the unstrained condition and 72,000 psi in the strained condition. The strain was calculated using the natural logarithm formula, resulting in a value of 0.916. The challenge is determining the average true stress between these two points, as the stress-strain curve is not linear. The user seeks guidance on calculating the area under the curve with only these two data points. Understanding how to approximate the area will help in finding the average true stress effectively.
Jason03
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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 can't just add and divide by two since the graph is not a straight line...
 
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How would I find the area under the curve when I only have two points?
 

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