1. The problem statement, all variables and given/known data 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 2. Relevant equations c) Compare this value with the reference books and state what material it may be. (d) The 0.5 per cent proof stress 3. 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.