- #1
Roshane
- 1
- 0
Homework Statement
I have the following table
Load 25 50 75 100 125 150 160 170
Extension 0.38 0.75 1.15 1.53 2.8 8.6 15 28
and I need to:
1. Plot the stress – strain or (load-extension) graph and determine
(a) Approximate value of the elastic limit
(b) Young’s Modulus for the material
Homework Equations
c) Compare this value with the reference books and state what material it may be.
(d) The 0.5 per cent proof stress
The Attempt at a Solution
· When the graph is plotted and I attempt to work it out with software, it shows that the data has a systematic error (It doesn’t intercept y at the origin).
This is again shown when a graph of the natural log of strain vs stress is plotted. It should result in a straight line going through the origin, but it doesn’t.