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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

Xu, Qiang, Yang, Xin and Lu, Zhongyu (2017) 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. Materials at High Temperatures, 34 (5-6). pp. 323-332. ISSN 0960-3409

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Abstract

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.

Item Type: Article
Subjects: T Technology > T Technology (General)
Schools: School of Computing and Engineering
Related URLs:
Depositing User: Sharon Beastall
Date Deposited: 11 Oct 2017 09:34
Last Modified: 16 Dec 2017 01:34
URI: http://eprints.hud.ac.uk/id/eprint/33671

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