Inelastic Deformation of Metals and Structures under Dynamic and Quasi-Static Cyclic Loading.

摘要

The investigations of the modes of cyclic plastic behaviour in tubes under internal pressure and cyclic thermal gradient have been continued. An approximate uniaxial model of the biaxial tube problem is used for studying the influence of the hardening rule on the cyclic plastic behaviour. Comparisons are made between kinematic and isotropic hardening rules. These two theories represent the extremes of cyclic plastic behaviour. The cyclic plastic behaviour of specimens used in the so-called pulley test are studied using linear kinematic hardening theory. The pulley test simulates the cyclic thermal stresses by means of cyclic bending of a thin specimen around the circumference of a freely rotating pulley. Theoretical results for stress and strain behaviour are obtained for both wire and strip specimens. In Part 3, the reference stress method - which has been used with great success in the analysis of creeping structures - is applied to the analysis of components operating under conditions where cyclic hardening and cyclic creep are dominant.