Inelastic analysis versus simplified rules for stress concentration fields under variable loading and high temperature

摘要

Phenomenological constitutive equations that describe the inelastic behaviour of advanced 9–n12%Cr heat-resistant steels at high temperature and multi-axial stress state are used to studynstress concentration fields. The model takes into account hardening/recovery, softening andndamage properties by appropriate state variables. The inelastic response of a notched platenunder cyclic loading/holding/unloading sequences is analysed by the finite element method andnthe constitutive model. Furthermore, different simplified rules that are available for rapidnassessment of stress concentration fields are applied and the results are compared with thenresults of inelastic structural analysis. We show that the simplified rules can provide a goodnestimation of several points on the stress–strain loop.