Elastic surface crack interaction and its engineering critical assessment within the framework of fitness-for-service standards

In real industrial conditions, it�s common to witness the interaction of multiple cracks such that their stress fields and crack driving forces are disturbed. For coplanar cracks, a greater hazard is expected because of the amplification phenomenon. FFS standards deal with this by proposing interact...

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Main Authors: Gabriel de Castro Co�lho, Antonio Almeida Silva, Marco Antonio dos Santos
Format: Article
Language:English
Published: Gruppo Italiano Frattura 2022-04-01
Series:Fracture and Structural Integrity
Subjects:
Online Access:https://www.fracturae.com/index.php/fis/article/view/3366/3483
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author Gabriel de Castro Co�lho
Antonio Almeida Silva
Marco Antonio dos Santos
author_facet Gabriel de Castro Co�lho
Antonio Almeida Silva
Marco Antonio dos Santos
author_sort Gabriel de Castro Co�lho
collection DOAJ
description In real industrial conditions, it�s common to witness the interaction of multiple cracks such that their stress fields and crack driving forces are disturbed. For coplanar cracks, a greater hazard is expected because of the amplification phenomenon. FFS standards deal with this by proposing interaction rules and idealizing a combined flaw for the FAD methodology to be used. The goal of this paper is to analyze the effectiveness of this standards methodology considering twin surface semielliptical cracks on a plate under mode I loading on the interaction range using FE analyses. Results confirm that the amplification phenomena due to the interaction are higher on the interacting crack tip and progressively higher as the coplanar horizontal distance decreases. The loss of constraint was observed to decrease as the coplanar horizontal distance decreased, but little change was observed regarding its parametric angular position. A higher amplification was found at the coplanar horizontal distance on which crack interaction is to be considered meaningful, which indicates inconsistency regarding the interaction criteria used on FFS standards. To conclude, the engineering critical assessment of the combined flaw proved to be over-conservative as the remaining operational life was observed on the assessment of the interacting flaws.
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spelling doaj-art-3cc1a16fa426414690b60ccf53907caa2025-01-02T23:00:56ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932022-04-01166013414510.3221/IGF-ESIS.60.1010.3221/IGF-ESIS.60.10Elastic surface crack interaction and its engineering critical assessment within the framework of fitness-for-service standardsGabriel de Castro Co�lhoAntonio Almeida SilvaMarco Antonio dos SantosIn real industrial conditions, it�s common to witness the interaction of multiple cracks such that their stress fields and crack driving forces are disturbed. For coplanar cracks, a greater hazard is expected because of the amplification phenomenon. FFS standards deal with this by proposing interaction rules and idealizing a combined flaw for the FAD methodology to be used. The goal of this paper is to analyze the effectiveness of this standards methodology considering twin surface semielliptical cracks on a plate under mode I loading on the interaction range using FE analyses. Results confirm that the amplification phenomena due to the interaction are higher on the interacting crack tip and progressively higher as the coplanar horizontal distance decreases. The loss of constraint was observed to decrease as the coplanar horizontal distance decreased, but little change was observed regarding its parametric angular position. A higher amplification was found at the coplanar horizontal distance on which crack interaction is to be considered meaningful, which indicates inconsistency regarding the interaction criteria used on FFS standards. To conclude, the engineering critical assessment of the combined flaw proved to be over-conservative as the remaining operational life was observed on the assessment of the interacting flaws.https://www.fracturae.com/index.php/fis/article/view/3366/3483crack interactionstress intensity factorfailure assessment diagrambs 7910api 579/asme ffs-1
spellingShingle Gabriel de Castro Co�lho
Antonio Almeida Silva
Marco Antonio dos Santos
Elastic surface crack interaction and its engineering critical assessment within the framework of fitness-for-service standards
Fracture and Structural Integrity
crack interaction
stress intensity factor
failure assessment diagram
bs 7910
api 579/asme ffs-1
title Elastic surface crack interaction and its engineering critical assessment within the framework of fitness-for-service standards
title_full Elastic surface crack interaction and its engineering critical assessment within the framework of fitness-for-service standards
title_fullStr Elastic surface crack interaction and its engineering critical assessment within the framework of fitness-for-service standards
title_full_unstemmed Elastic surface crack interaction and its engineering critical assessment within the framework of fitness-for-service standards
title_short Elastic surface crack interaction and its engineering critical assessment within the framework of fitness-for-service standards
title_sort elastic surface crack interaction and its engineering critical assessment within the framework of fitness for service standards
topic crack interaction
stress intensity factor
failure assessment diagram
bs 7910
api 579/asme ffs-1
url https://www.fracturae.com/index.php/fis/article/view/3366/3483
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