scholarly journals Computer Simulation on Fracture of Engineering Materials at High Temperature. III: Total and/or Remaining Life Assessment of Structural Material.

1996 ◽  
Vol 45 (1) ◽  
pp. 137-142 ◽  
Author(s):  
Kazunari FUJIYAMA
Keyword(s):  
Computer Simulation ◽  
High Temperature ◽  
Structural Material ◽  
Life Assessment ◽  
Remaining Life ◽  
Engineering Materials ◽  
Remaining Life Assessment

Elevated-Temperature Life Assessment

2021 ◽  
pp. 146-166
Author(s):  
Arun Sreeranganathan ◽  
Douglas L. Marriott
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Stress Relaxation ◽  
Damage Mechanics ◽  
Elevated Temperatures ◽  
Constitutive Models ◽  
Life Assessment ◽  
Remaining Life ◽  
High Temperature Components ◽  
Remaining Life Assessment

Abstract This article provides some new developments in elevated-temperature and life assessments. It is aimed at providing an overview of the damage mechanisms of concern, with a focus on creep, and the methodologies for design and in-service assessment of components operating at elevated temperatures. The article describes the stages of the creep curve, discusses processes involved in the extrapolation of creep data, and summarizes notable creep constitutive models and continuum damage mechanics models. It demonstrates the effects of stress relaxation and redistribution on the remaining life and discusses the Monkman-Grant relationship and multiaxiality. The article further provides information on high-temperature metallurgical changes and high-temperature hydrogen attack and the steps involved in the remaining-life prediction of high-temperature components. It presents case studies on heater tube creep testing and remaining-life assessment, and pressure vessel time-dependent stress analysis showing the effect of stress relaxation at hot spots.

Life Assessment of Steam-Turbine Components

1989 ◽  
pp. 265-328
Keyword(s):  
High Temperature ◽  
Steam Turbine ◽  
Failure Modes ◽  
Assessment Methods ◽  
Life Assessment ◽  
Remaining Life ◽  
Steam Turbines ◽  
Damage Mechanisms ◽  
Design Considerations ◽  
Remaining Life Assessment

Abstract This chapter covers the failure modes and mechanisms of concern in steam turbines and the methods used to assess remaining component life. It provides a detailed overview of the design considerations, material requirements, damage mechanisms, and remaining-life-assessment methods for the most-failure prone components beginning with rotors and continuing on to casings, blades, nozzles, and high-temperature bolts. The chapter makes extensive use of images, diagrams, data plots, and tables and includes step-by-step instructions where relevant.

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