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Determination of stress intensity factors and J integral based on digital image correlation

Breitbarth, Eric and Strohmann, Tobias and Besel, Michael and Reh, Stefan (2019) Determination of stress intensity factors and J integral based on digital image correlation. Frattura ed Integrità Strutturale/Fracture and Structural Integrity, 13 (49), pp. 12-25. Gruppo Italiano Frattura. DOI: 10.3221/IGF-ESIS.49.02 ISSN 1971-8993

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Digital image correlation (DIC) is a technique in experimental mechanics to acquire full-field measurement data of displacements and deformations from the surface of specimens or components. Especially for the investigations of cracks it provides additional benefits. The actually present deformation field in the vicinity of the crack tip can be obtained which directly reflects for example crack closure effects or plasticity. Against this background the paper summarizes a procedure to compute the J integral and the stress intensity factors KI and KII based on DIC data. For this purpose the J and interaction integral are computed as line and domain integrals. Through experiments it is shown that the domain integral is less affected by scatter of the DIC data. Furthermore, the specific domain, facet sizes and facet distances slightly influence the results.

Item URL in elib:https://elib.dlr.de/128920/
Document Type:Article
Title:Determination of stress intensity factors and J integral based on digital image correlation
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Breitbarth, EricEric.Breitbarth (at) dlr.dehttps://orcid.org/0000-0002-3479-9143
Strohmann, TobiasTobias.Strohmann (at) dlr.deUNSPECIFIED
Besel, MichaelMichael.Besel (at) dlr.deUNSPECIFIED
Reh, StefanStefan.Reh (at) dlr.deUNSPECIFIED
Date:July 2019
Journal or Publication Title:Frattura ed Integrità Strutturale/Fracture and Structural Integrity
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.3221/IGF-ESIS.49.02
Page Range:pp. 12-25
Publisher:Gruppo Italiano Frattura
Keywords:Aluminum; Digital Image Correlation; Fatigue crack; Interaction integral; J integral
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials, L - Simulation and Validation
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research
Deposited By: Breitbarth, Eric
Deposited On:06 Nov 2019 15:53
Last Modified:20 Jan 2020 12:44

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