Title

Strain And Damage-Based Analytical Methods To Determine The Kachanov-Rabotnov Tertiary Creep-Damage Constants

Keywords

constant determination; continuum damage mechanics; Kachanov-Rabotnov; master curve; Ni-base superalloys; Norton's power law; rupture prediction; stress-independent; Waspaloy

Abstract

In the power generation industry, the goal of increased gas turbine efficiency has led to increased operating temperatures and pressures necessitating nickel-base superalloy components. Under these conditions, the tertiary creep regime can become the dominant form of creep deformation. In response, the classical Kachanov-Rabotnov coupled creep-damage constitutive model is often used to predict the creep deformation and damage of Ni-base superalloys. In this model, the secondary creep behavior can be determined through analytical methods while the tertiary creep behavior is often found using trial and error or numerical optimization. Trial and error may produce no constants. Numerical optimization can be computationally expensive. In this study, a strain-based and damage-based approach to determine the tertiary creep behavior of nickel-base superalloys has been developed. Analytically determined constants are found for a given nickel-base superalloy. Creep deformation and damage evolution curves are compared. Methods to deal with stress dependence are introduced and studied. © The Author(s), 2011.

Publication Date

11-1-2012

Publication Title

International Journal of Damage Mechanics

Volume

21

Issue

8

Number of Pages

1186-1201

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1177/1056789511430519

Socpus ID

84867643556 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84867643556

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