Category
Poster - Applied
Description
This study focuses on developing and applying the creep-fatigue Internal State Variable (ISV) constitutive theory for the advanced high-temperature nuclear reactor steels (e.g., 316H stainless steel) to better understand how these materials deform and fracture at high temperatures under cyclic loading condition. In particular, we consider the damage evolution in these steels when some low-cycle loading is applied with finite holding periods. As such, this problem is highly history dependent, which requires tracking the evolution of some relevant microstructural rearrangements and its related properties during these complicated boundary conditions. In this study, we apply a continuum scale ISV plasticity-damage constitutive theory to capture the effects on the creep-fatigue behavior in a context of structure-property relationship observed from laboratory experiments. Comparing our model results to lab experimental stress-strain behavior under the creep-fatigue loadings, we show that our model well accounts for the overall stress-strain behavior through the evolving history variables (herein isotropic hardening, kinematic hardening, and damage) with the finite deformation. In the future, this constitutive model has the potential to be a useful tool to explore more realistic nuclear reactor problems to better understand and predict the thermomechanical behavior and failure of various components in the next generation of high-temperature reactors.
Modeling for Creep-Fatigue-Induced Damage of Advanced High-Temperature Nuclear Reactor Steels
Poster - Applied
This study focuses on developing and applying the creep-fatigue Internal State Variable (ISV) constitutive theory for the advanced high-temperature nuclear reactor steels (e.g., 316H stainless steel) to better understand how these materials deform and fracture at high temperatures under cyclic loading condition. In particular, we consider the damage evolution in these steels when some low-cycle loading is applied with finite holding periods. As such, this problem is highly history dependent, which requires tracking the evolution of some relevant microstructural rearrangements and its related properties during these complicated boundary conditions. In this study, we apply a continuum scale ISV plasticity-damage constitutive theory to capture the effects on the creep-fatigue behavior in a context of structure-property relationship observed from laboratory experiments. Comparing our model results to lab experimental stress-strain behavior under the creep-fatigue loadings, we show that our model well accounts for the overall stress-strain behavior through the evolving history variables (herein isotropic hardening, kinematic hardening, and damage) with the finite deformation. In the future, this constitutive model has the potential to be a useful tool to explore more realistic nuclear reactor problems to better understand and predict the thermomechanical behavior and failure of various components in the next generation of high-temperature reactors.
Comments
Doctorate