Development of probabilistic fracture mechanics method for fatigue life prediction based on EIFS concept

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Title: Development of probabilistic fracture mechanics method for fatigue life prediction based on EIFS concept
Authors: Zou, Guang
Banisoleiman, Kian
González, Arturo
Permanent link: http://hdl.handle.net/10197/8759
Date: Jun-2017
Abstract: A problem with fracture mechanics (FM) based fatigue analysis is that reliable information on initial crack/flaw size is often unavailable. Also, FM method cannot be applied directly to welded joints with relatively small initial flaws and long crack initiation life. This paper proposes a novel probabilistic FM method based on the equivalent initial flaw size (EIFS) concept. The initial crack size is substituted with EIFS to take both the crack initiation and propagation life into account. Three methods are tested to obtain mean value of EIFS: calibrating to S-N curve, Kitagawa-Takahashi (KT) diagram and fitting to test data. The obtained EIFSs are evaluated by comparing the predicted fatigue lives and crack evolutions with S-N curve and test crack evolution data. The suggested procedure is to derive the mean value of EIFS from S-N curve and the coefficient of variation from KT diagram.
Funding Details: European Commission Horizon 2020
Type of material: Conference Publication
Publisher: ASME
Copyright (published version): 2017 ASME
Keywords: Fracture mechanics;Equivalent initial flaw size;S-N curve;KT diagram
Language: en
Status of Item: Peer reviewed
Is part of: ASME
Conference Details: 36th International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2017), Trondheim, Norway, June, 2017
Appears in Collections:Critical Infrastructure Group Research Collection
Civil Engineering Research Collection
TRUSS-ITN Research Collection

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