A material has a stress of 60,000Pa and a strain of 0.4 at breaking point.
Given that it is in the shape of a 2m long cylinder of radius 20cm, what work had to be done to extend the material to the point of fracture?
Well i thought work done was equal to the area under the graph.
The Attempt at a Solution
Therefore: 0.5 x 60,000 x 0.4 = 12,000 J
Apparently answer is 0.6 J, so im fairly off. any ideas?