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Type: Journal article
Title: A strip yield model for two collinear cracks in plates of arbitrary thickness
Author: Chang, D.
Kotooussov, A.
Citation: International Journal of Fracture, 2012; 176(1):39-47
Publisher: Kluwer Academic Publ
Issue Date: 2012
ISSN: 0376-9429
Statement of
Donghoon Chang, Andrei Kotousov
Abstract: As two cracks grow and approach each other under fatigue loading, a deleterious interaction between them can considerably affect the crack growth rate, making theoretical evaluations and experimental data from a single isolated crack case considerably inaccurate. The aim of the present study is to investigate the interaction between two collinear cracks of equal length, taking into account the plate’s thickness effect, which was demonstrated to have a large effect on fatigue crack growth in the case of a single crack. The obtained solution to the problem is based on the Dugdale strip yield model and the distributed dislocation technique. In addition, a fundamental solution for an edge dislocation in a finite thickness plate is utilised. The present solution shows a very good agreement with previously published results for some limiting cases. The obtained results confirm a significant dependence of the interaction and stress intensity factors on the plate thickness, which can dramatically affect the plastic collapse conditions as well as fatigue crack growth rates.
Keywords: Collinear cracks
Crack interaction
Distributed dislocation technique (DDT)
Multiple site damage (MSD)
Plastic collapse
Plate thickness effect
Strip yield model
Through-the-thickness crack
Rights: © Springer Science+Business Media B.V. 2012
DOI: 10.1007/s10704-012-9724-0
Published version:
Appears in Collections:Aurora harvest
Materials Research Group publications
Mechanical Engineering conference papers

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