Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1560554 | Computational Materials Science | 2014 | 12 Pages |
•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.