3D Analyses of crack propagation in torsion

The initiation and propagation of fatigue cracks during cyclic torsion loading was studied in a cast Al alloy (A357) with a relatively large (~500 μm) grain size. 2D observations, revealed that multi site crack initiation occur on the {111} slip planes exhibiting the highest slip activity (iso-str...

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Main Authors: D. Shiozawa, I. Serrano-Munoz, S. Dancette, C. Verdu, J. Lachambre, J.-Y. Buffiere
Format: Article
Language:English
Published: Gruppo Italiano Frattura 2015-07-01
Series:Fracture and Structural Integrity
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Online Access:http://www.gruppofrattura.it/pdf/rivista/numero33/numero_33_art_7.pdf
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author D. Shiozawa
I. Serrano-Munoz
S. Dancette
C. Verdu
J. Lachambre
J.-Y. Buffiere
author_facet D. Shiozawa
I. Serrano-Munoz
S. Dancette
C. Verdu
J. Lachambre
J.-Y. Buffiere
author_sort D. Shiozawa
collection DOAJ
description The initiation and propagation of fatigue cracks during cyclic torsion loading was studied in a cast Al alloy (A357) with a relatively large (~500 μm) grain size. 2D observations, revealed that multi site crack initiation occur on the {111} slip planes exhibiting the highest slip activity (iso-strain Taylor analysis), preferentially on planes nearly perpendicular to the sample axis. Within the first grain, the cracks have a pronounced crystallographic propagation mode (mode II crack growth) and strongly interact with the grain boundaries. In situ 3D monitoring of torsion fatigue tests using synchrotron X-ray tomography reveal that propagation towards the interior of the samples occurs first along the sample periphery in mode II leading to relatively shallow cracks which penetrate towards the sample center only after a large number of cycles is reached .The values of mode I, II and III stress intensity factors have been calculated from finite element simulation at the tip of the shallow mode II crack. Those values are used to analyse the bulk propagation of the observed cracks.
format Article
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institution Kabale University
issn 1971-8993
1971-8993
language English
publishDate 2015-07-01
publisher Gruppo Italiano Frattura
record_format Article
series Fracture and Structural Integrity
spelling doaj-art-bf2b3ae571c846768f9e00851a630aff2025-01-03T01:50:26ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89931971-89932015-07-01933566010.3221/IGF-ESIS.33.073D Analyses of crack propagation in torsionD. Shiozawa0I. Serrano-Munoz1S. Dancette2C. Verdu3J. Lachambre4J.-Y. Buffiere5Kobe University,JapanINSA-Lyon,FranceINSA-Lyon,FranceINSA-Lyon,FranceINSA-Lyon,FranceINSA-Lyon,FranceThe initiation and propagation of fatigue cracks during cyclic torsion loading was studied in a cast Al alloy (A357) with a relatively large (~500 μm) grain size. 2D observations, revealed that multi site crack initiation occur on the {111} slip planes exhibiting the highest slip activity (iso-strain Taylor analysis), preferentially on planes nearly perpendicular to the sample axis. Within the first grain, the cracks have a pronounced crystallographic propagation mode (mode II crack growth) and strongly interact with the grain boundaries. In situ 3D monitoring of torsion fatigue tests using synchrotron X-ray tomography reveal that propagation towards the interior of the samples occurs first along the sample periphery in mode II leading to relatively shallow cracks which penetrate towards the sample center only after a large number of cycles is reached .The values of mode I, II and III stress intensity factors have been calculated from finite element simulation at the tip of the shallow mode II crack. Those values are used to analyse the bulk propagation of the observed cracks.http://www.gruppofrattura.it/pdf/rivista/numero33/numero_33_art_7.pdfTorsionCracks3D imagingStress Intensity FactorsMode III mode II
spellingShingle D. Shiozawa
I. Serrano-Munoz
S. Dancette
C. Verdu
J. Lachambre
J.-Y. Buffiere
3D Analyses of crack propagation in torsion
Fracture and Structural Integrity
Torsion
Cracks
3D imaging
Stress Intensity Factors
Mode III mode II
title 3D Analyses of crack propagation in torsion
title_full 3D Analyses of crack propagation in torsion
title_fullStr 3D Analyses of crack propagation in torsion
title_full_unstemmed 3D Analyses of crack propagation in torsion
title_short 3D Analyses of crack propagation in torsion
title_sort 3d analyses of crack propagation in torsion
topic Torsion
Cracks
3D imaging
Stress Intensity Factors
Mode III mode II
url http://www.gruppofrattura.it/pdf/rivista/numero33/numero_33_art_7.pdf
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AT sdancette 3danalysesofcrackpropagationintorsion
AT cverdu 3danalysesofcrackpropagationintorsion
AT jlachambre 3danalysesofcrackpropagationintorsion
AT jybuffiere 3danalysesofcrackpropagationintorsion