Engineering stress (s) = force/ao, true stress (st) = force/ai,
engineering strain (e)
= ? l/lo and true strain (e) = ln(li/lo) where ao = original
cross-sectional area, and ai
and li are the area and the length, respectively, at the point of
interest, respectively.
recall that true stress (st) and true strain (e) are derived from
engineering stress (s) and
strain (e). describe in detail and derive the correlation
between
a) engineering stress and ture stress and
b) engineering streain (e) and true strain (e).