Article ID Journal Published Year Pages File Type
1560554 Computational Materials Science 2014 12 Pages PDF
Abstract

•Modeling of cyclic plastic and ratcheting deformation behavior of AISI 316L.•Capability to reproduce the effect of strain amplitude, temperature and ratcheting.•Internal variable dependent Chaboche-type model.•Calibration procedure characterized by reduced complexity allowing the application in an industrial context.•Straightforward implementation in a commercial finite element code.

The purpose of this work is to provide a reduced complexity constitutive model capable of accurately reproducing the material response of stainless steels under conditions of thermal stress-induced deformation occurring in the primary cooling circuit of a light water nuclear reactor. The proposed approach consists of a Chaboche-type material description, modified to allow the kinematic hardening parameters to vary as a function of a set of internal variables. The methodology implemented to calibrate the model using low cycle fatigue and strain-controlled ratcheting experiments performed on a stainless steel of grade AISI 316L is presented in detail. The improvement provided by the internal variable constitutive model is evaluated by a comparison with simulations carried out by means of an unmodified Chaboche description and with experimental data for strain-controlled, stress-controlled and thermo-mechanical low cycle fatigue tests.

Related Topics
Physical Sciences and Engineering Engineering Computational Mechanics
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