Thesis
Extended Breelike diagrams for high temperature structures
- Creator
- Rights statement
- Awarding institution
- University of Strathclyde
- Date of award
- 2022
- Thesis identifier
- T16355
- Person Identifier (Local)
- 201774514
- Qualification Level
- Qualification Name
- Department, School or Faculty
- Abstract
- With the development of nuclear engineering, there is an increasing demand for structural integrity assessment for the design and life extension of nuclear reactors. The high operating temperature and cyclic loading conditions could significantly affect the longevity of nuclear components, causing creep and fatigue damage. The Bree diagram has been proposed for the quick determination of structural response and cyclic plasticity behaviours. As a series of direct methods, the Linear Matching Method (LMM) framework has also been proposed to provide a complete solution for hightemperature structural integrity assessment. In this work, the Bree-like diagrams are extended for structural design and assessment. At lower temperatures, the shakedown limit is extended by considering kinematic hardening materials. Constant low cycle fatigue life curves are also added to the Bree-like diagram. At higher temperatures, the creep rupture limit can be plotted considering cyclic loads. Constant creep-fatigue life curves are also added to the Bree-like diagram. Meanwhile, the LMM framework is further developed for the evaluation of extended Bree-like diagrams. In the LMM shakedown algorithm, a twosurface kinematic hardening model is implemented. In the LMM creep rupture algorithm, a Unified Creep Rupture Equation (UCRE) is implemented for the interpolation of creep rupture curves. Based on the LMM DSCA algorithm, a Unified Procedure for Fatigue and Ratchet Analysis (UPFRA) is developed to evaluate the constant fatigue life curves and ratchet limit. Based on the LMM eDSCA algorithm, an extended UPFRA is developed to evaluate the constant creep-fatigue life curves. In addition, several engineering examples are presented in this work and the mechanisms of creep and cyclic plasticity behaviours of high-temperature structures have been investigated and discussed. Therefore, the capability and functionality of the existing LMM framework have been improved by implementing multiple numerical procedures for different aspects of structural integrity assessment. The Bree-like diagram has also been enhanced in various ways to provide a reliable engineering tool for high-temperature design and assessment.
- Advisor / supervisor
- Chen, Haofeng
- Resource Type
- DOI
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PDF of thesis T16355 | 2022-11-03 | Public | Download |