Title:
Self-consistent modeling of the mechanical behavior of an austenitic
stainless steel under low cycle fatigue loading
J. Zhou1,*, Z. Sun1, D. Retraint1, P. Kanouté2
2
1
ICD, P2MN, LASMIS, University of Technology of Troyes, UMR 6281, CNRS, Troyes, France
ONERA, The French Aerospace Lab, 29 avenue de la Division Leclerc, 92322 Chatillon Cedex, France
Corresponding author: [email protected]
Symposium:
Multiscale modeling
Abstract
Experimental results of low cycle fatigue (LCF) tests, with total strain amplitudes
of ±0.8%, ±1.0% and ±1.25%, show that the studied 316L austenitic stainless steel
undergoes an initial hardening followed by a large softening range, and then
reaches stress stabilization until failure. Furthermore, stress analysis highlights
obvious strain range effect for this material during cyclic loading.
In this work, an elastic-inelastic self-consistent model for polycrystals is used to
simulate the mechanical behavior of the material under uniaxial low cycle fatigue
loadings. A modified kinematic hardening variable χs and a set of isotropic
hardening variables k s , associated with state variables of crystal slip systems, are
proposed to describe the hardening/softening behavior of the material. Along
with the parameters concerning grain/matrix interaction law and homogenization
method, material parameters of isotropic hardening are first identified based on
macroscopic isotropic curves using numerical optimization methods. Kinematic
hardening constants are then obtained by fitting cyclic loops with the previous
determined parameters. It is shown that the modified model taking into account
the identified parameters is able to properly describe the cyclic
hardening/softening behavior under uniaxial loading with small strain amplitude
range (from ±0.8% to ±1.25%).