A very useful reference is Hales, R., Holdsworth, R., O'Donnell, M.P., Perrin, I.J., and Skelton, R.P., "A Code of Practice for Determination of Cyclic Stress-Strain Data", Materials at High Temperatures 19(4), pp. 165-185, 2002.
For an introductory overview of this topic, you should probably...