The first chart on page 43 of this link is nice and straight forward for discussion.

http://books.google.com/books?id=Hbo8dI4...eel&f=false



I like the explanation of fatigue at this link.
http://www.sv.vt.edu/classes/MSE2094_NoteBook/97ClassProj/anal/kelly/fatigue.html#S_Ncurve

Last edited by Chuck H; 06/04/13 09:46 AM.