This is just a simple questions concerning the method of obtaining nominal stress and nominal strain. From various sources on the net they refer to nominal stress/strain as engineering strain
therefore can I just use the simple equations for stress and strain?
In this instance the material I'm looking at is rubber and I've assumed it is a hyper elastic material. I've elongated the sample piece (for simplicity's sake assume the sample is a square) until failure and recorded such data as Force,elongation,stress.
So for this instance how would I determine nominal stress and nominal strain?
The Attempt at a Solution