for a uni question i need to draw a stress - strain graph. i worked out the stress and strain and drew the graph, then i was asked to find the 0.2% proof stress. the scale of my strain at the bottom of the graph went from 0 - 0.02 so i couldnt find the 0.2%. after trawling the internet for hours i have found that some people say 0.02 expressed as a percentage is 0.2, which i understand but then how do i label the graph? do i lable the x axis "strain" with the scale 0 - 0.02 or %strain with the scale 0 - 2. if the second option is right then at what stage do i times the strain by 100 to make it a percent? before or after i find the youngs modulus? (stress/strain) |