On the development of creep damage constitutive equations: modified hyperbolic sine law for minimum creep strain rate and stress and creep fracture criterion based on cavity area fraction along grain boundary

Qiang Xu, Xin Yang, Zhongyu Lu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This paper reports 1) the latest development and application of modified hyperbolic sine law for minimum creep strain rate and stress for both low Cr and high Cr steels, and 2) the development of creep fracture criterion based on cavity area fraction along grain boundary for high Cr steel. This work is part of the fundamental development of creep damage constitutive equations which were identified through a critical literature review.
In the former the application of the new law results in an improved fitting; in the latter, a new creep fracture criterion based on cavity area fraction along grain boundary was derived and quantitatively calibrated using the latest detailed cavity nucleation and growth kinetics models for high Cr steel. Furthermore, this
paper revealed the trend of nucleation rate coefficient with stress, and the trend of creep life time coefficient with stress, which provide reliable and universal prediction capabilities.
This paper contributes to the specific knowledge on the minimum creep strain rate and stress function, the development of a scientific sound and novel creep rupture criterion based on the cavity area fraction along grain boundary for high Cr steel, and the provision of creep damage/life prediction tools
LanguageEnglish
Pages323-332
Number of pages10
JournalMaterials at High Temperatures
DOIs
Publication statusPublished - 17 Nov 2017

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constitutive equations
Constitutive equations
strain rate
Strain rate
Creep
Grain boundaries
grain boundaries
steels
damage
cavities
Steel
nucleation
stress functions
trends
coefficients
predictions
Nucleation
life (durability)
acoustics
Growth kinetics

Cite this

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title = "On the development of creep damage constitutive equations: modified hyperbolic sine law for minimum creep strain rate and stress and creep fracture criterion based on cavity area fraction along grain boundary",
abstract = "This paper reports 1) the latest development and application of modified hyperbolic sine law for minimum creep strain rate and stress for both low Cr and high Cr steels, and 2) the development of creep fracture criterion based on cavity area fraction along grain boundary for high Cr steel. This work is part of the fundamental development of creep damage constitutive equations which were identified through a critical literature review.In the former the application of the new law results in an improved fitting; in the latter, a new creep fracture criterion based on cavity area fraction along grain boundary was derived and quantitatively calibrated using the latest detailed cavity nucleation and growth kinetics models for high Cr steel. Furthermore, thispaper revealed the trend of nucleation rate coefficient with stress, and the trend of creep life time coefficient with stress, which provide reliable and universal prediction capabilities.This paper contributes to the specific knowledge on the minimum creep strain rate and stress function, the development of a scientific sound and novel creep rupture criterion based on the cavity area fraction along grain boundary for high Cr steel, and the provision of creep damage/life prediction tools",
keywords = "minimum creep strain rate, creep fracture rupture, cavity area fraction along grain boundary, creep damage, low Cr steel, high Cr steel",
author = "Qiang Xu and Xin Yang and Zhongyu Lu",
note = "Article still in press. DOI not working yet. Paying APC.",
year = "2017",
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doi = "http://dx.doi.org/10.1080/09603409.2017.1388603",
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T2 - Materials at High Temperatures

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AU - Yang, Xin

AU - Lu, Zhongyu

N1 - Article still in press. DOI not working yet. Paying APC.

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N2 - This paper reports 1) the latest development and application of modified hyperbolic sine law for minimum creep strain rate and stress for both low Cr and high Cr steels, and 2) the development of creep fracture criterion based on cavity area fraction along grain boundary for high Cr steel. This work is part of the fundamental development of creep damage constitutive equations which were identified through a critical literature review.In the former the application of the new law results in an improved fitting; in the latter, a new creep fracture criterion based on cavity area fraction along grain boundary was derived and quantitatively calibrated using the latest detailed cavity nucleation and growth kinetics models for high Cr steel. Furthermore, thispaper revealed the trend of nucleation rate coefficient with stress, and the trend of creep life time coefficient with stress, which provide reliable and universal prediction capabilities.This paper contributes to the specific knowledge on the minimum creep strain rate and stress function, the development of a scientific sound and novel creep rupture criterion based on the cavity area fraction along grain boundary for high Cr steel, and the provision of creep damage/life prediction tools

AB - This paper reports 1) the latest development and application of modified hyperbolic sine law for minimum creep strain rate and stress for both low Cr and high Cr steels, and 2) the development of creep fracture criterion based on cavity area fraction along grain boundary for high Cr steel. This work is part of the fundamental development of creep damage constitutive equations which were identified through a critical literature review.In the former the application of the new law results in an improved fitting; in the latter, a new creep fracture criterion based on cavity area fraction along grain boundary was derived and quantitatively calibrated using the latest detailed cavity nucleation and growth kinetics models for high Cr steel. Furthermore, thispaper revealed the trend of nucleation rate coefficient with stress, and the trend of creep life time coefficient with stress, which provide reliable and universal prediction capabilities.This paper contributes to the specific knowledge on the minimum creep strain rate and stress function, the development of a scientific sound and novel creep rupture criterion based on the cavity area fraction along grain boundary for high Cr steel, and the provision of creep damage/life prediction tools

KW - minimum creep strain rate

KW - creep fracture rupture

KW - cavity area fraction along grain boundary

KW - creep damage

KW - low Cr steel

KW - high Cr steel

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