Advances on creep–fatigue damage assessment in notched components

Barbera, D., Chen, H. and Liu, Y. (2017) Advances on creep–fatigue damage assessment in notched components. Fatigue and Fracture of Engineering Materials and Structures, 40(11), pp. 1854-1867. (doi:10.1111/ffe.12603)

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Abstract

In this paper, the extended Direct Steady Cyclic Analysis method (eDSCA) within the Linear Matching Method Framework (LMMF) is combined with the Stress Modified Ductility Exhaustion method and the modified Cavity Growth Factor (CGF) for the first time. This new procedure is used to systematically investigate the effect of several load parameters including load level, load type and creep dwell duration on the creep–fatigue crack initiation process in a notched specimen. The results obtained are verified through a direct comparison with experimental results available in the literature demonstrating great accuracy in predicting the crack initiation life and the driving mechanisms. Furthermore, this extensive numerical study highlighted the possible detrimental effect of the creep–ratchetting mechanism on the crack growth process. This work has a significant impact on structural integrity assessments of complex industrial components and for the better understanding of creep–fatigue lab scale tests.

Item Type:Articles
Additional Information:The authors gratefully acknowledge the support of the University of Strathclyde, the Royal Society (IE140842), the International Cooperation and Exchange Project NSFC (11511130057) and the National Science Foundation for Distinguished Young Scholars of China (11325211) during the course of this work.
Keywords:Crack initiation, creep–fatigue interaction, cyclic loading, linear matching method.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Barbera, Dr Daniele
Authors: Barbera, D., Chen, H., and Liu, Y.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Fatigue and Fracture of Engineering Materials and Structures
Publisher:Wiley
ISSN:8756-758X
ISSN (Online):1460-2695
Published Online:06 March 2017
Copyright Holders:Copyright © 2017 Wiley Publishing Ltd.
First Published:First published in Fatigue and Fracture of Engineering Materials and Structures 40(11): 1854-1867
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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