Abstract
A statistical analysis is conducted on the parameters characterizing a generalized Ramberg-Osgood representation of non-stationary hysteretic uniaxial stress-strain curves. It is shown that the sample correlation coefficients between the maximum preceding stress amplitude and the four parameters in two generalized Ramberg-Osgood equations are slightly higher than those in Part I. The sample regression lines and confidence intervals are derived. A pair of bi-nonlinear equations is proposed as a set of hysteretic uniaxial stress-strain relations. It is demonstrated that the proposed formulae provide practically acceptable predictions for the wide-flange steel treated in Part I. It is illustrated that the proposed formulae modified by a scaling factor reflecting virgin strain-hardening characteristics provide predictions of a good accuracy also for another SS41 steel.
