A viscous-viscoelastic creep model
Loading...
Authors
Meeting name
Sponsors
Date
Journal Title
Format
Thesis
Subject
Abstract
The creep data of 304 stainless steel at 1100 °F (593 °C) for pure tension, pure torsion, and combined tension and torsion under varying stress history were analyzed. The variable stresses are step changes in stress including complete unloading, reloading, step-up, step-down, and side steps in which one stress component was held constant while the other was increased or decreased. To predict the complex creep behavior under variable stresses of combined tension and torsion, nonlinear constitutive relations were developed and predictions by the theory were compared with the creep data. In the viscous-viscoelastic creep model the total strain was separated into four strain components: elastic, time-independent plastic, time-dependent-recoverable viscoelastic, and time-dependent-nonrecoverable viscous strain. In this project, only the time-dependent creep strain components were analyzed. For variable loading a modified superposition principle was employed to represent the recoverable creep component, and a strain hardening theory was used to predict the non recoverable creep component. The effects of aging were also considered in the creep constitutive relations. Satisfactory agreement was obtained between the creep data for the variable stresses and the theoretical predictions based on the constant stress creep and creep recovery data.
Table of Contents
DOI
PubMed ID
Degree
M.S.
Thesis Department
Rights
OpenAccess.
License
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 License.