ABSTRACT
N. The final proposal that emerges after certain simplifications is that, for safety
where
(5.22)
(5.23a) (5.23b)
The stress-strain curve is still represented by the Ramberg-Osgood relation, eqn. (5.20), with Eo = (Jo/E; (J,er is the value from eqn. (5.20) for (J = (J,er; Fd(Jo) is the limit load expressed as a function of the yield stress (Jo (not the flow stress (In)' If simple power law hardening is taken, rather than the Ramberg-Osgood law, comparison of eqns. (2.76a) and (2.64) using eqn. (A3.23c)(from Appendix 3) shows that 11 ex: Ft + 1. The near invariance of the latter term noted by Ainsworth [25] is then closely governed by the statements of Chapter 2, Section 2.3.2.2 on the widespread but not complete validity of the variables separable concept for many configurations, at least of a test-piece-like nature, in which '1 is virtually a function of geometry only, nearly independent of the stress-strain law or degree of plasticity.
