Influence of Surface Flaw Interaction on Failure Assessment Diagram in the Framework of Fitness-for-Service Procedures

Influence of Surface Flaw Interaction on Failure Assessment Diagram in the Framework of Fitness-for-Service Procedures | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 1 July 2025 V1 Latest version Share on Influence of Surface Flaw Interaction on Failure Assessment Diagram in the Framework of Fitness-for-Service Procedures Authors : Gabriel de Castro Coêlho 0000-0002-4046-6812 [email protected] , Júlio Feitosa da Silva Neto , Antonio Almeida Silva , and Marco Antonio dos Santos Authors Info & Affiliations https://doi.org/10.22541/au.175135183.35868753/v1 158 views 95 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract The operational safety assessment of structures and mechanical components containing crack-like flaws remains among the most challenging aspects of engineering practice. Fitness-for-service standards, such as BS 7910 and API 579/ASME FFS-1, incorporate state-of-the-art methodologies for the structural integrity assessment of flawed structures, with the Failure Assessment Diagram (FAD) approach being the most widely adopted for the evaluation of individual cracks. Nevertheless, in many cases, multiple cracks are observed in close proximity, wherein the stress fields associated with each crack interact, potentially resulting in an amplification of the driving forces for crack propagation. The methodologies outlined in fitness-for-service standards recommend recharacterizing such defects as a single flaw – referred to as a bounding flaw – and subsequently conducting the assessment of this idealized defect using the FAD methodology. Recent findings, however, have indicated that this approach may be excessively conservative, thereby leading to the premature retirement of structures or components. Accordingly, the present study aims to compare the conventional bounding flaw approach with a more refined analysis of surface cracks under interaction regimes. The influence of geometric parameters, such as aspect ratio, depth ratio, and coplanar distance, was evaluated both in the construction of FADs and in the assessment of the effectiveness of the bounding flaw methodology. To this end, a series of finite element simulations was conducted. The analysis of the failure assessment diagrams revealed a reduction in the area beneath the curve – indicative of safe operating conditions – as the flaws approached one another, which was correlated with an increase in the plastic component of the J-integral induced by their interaction. However, as the depth ratio of one of the flaws increased, the influence of the coplanar distance was observed to diminish, as the relative amplification decreased in comparison to the other flaw. Ultimately, the bounding flaw methodology was deemed effective in ensuring operational safety, as it consistently exhibited greater severity than the highest amplification levels observed among the interacting flaw pairs. Nevertheless, conservative – and, in certain instances, overly conservative – scenarios were identified. Furthermore, it was observed that this excessive conservatism could be mitigated by considering the flaw with the greater depth ratio for the estimation of the reference stress and, consequently, for the determination of the load ratio coordinate. Supplementary Material File (coêlho et al_artigo 6_doutorado_v3.docx) Download 1.89 MB Information & Authors Information Version history V1 Version 1 01 July 2025 Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords crack interaction defect assessment finite element analysis structural integrity assessment Authors Affiliations Gabriel de Castro Coêlho 0000-0002-4046-6812 [email protected] Universidade Federal de Campina Grande Sistema de Bibliotecas View all articles by this author Júlio Feitosa da Silva Neto Universidade Federal de Campina Grande Sistema de Bibliotecas View all articles by this author Antonio Almeida Silva Universidade Federal de Campina Grande Sistema de Bibliotecas View all articles by this author Marco Antonio dos Santos Universidade Federal de Campina Grande Sistema de Bibliotecas View all articles by this author Metrics & Citations Metrics Article Usage 158 views 95 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Gabriel de Castro Coêlho, Júlio Feitosa da Silva Neto, Antonio Almeida Silva, et al. Influence of Surface Flaw Interaction on Failure Assessment Diagram in the Framework of Fitness-for-Service Procedures. Authorea . 01 July 2025. DOI: https://doi.org/10.22541/au.175135183.35868753/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . Format Please select one from the list RIS (ProCite, Reference Manager) EndNote BibTex Medlars RefWorks Direct import Tips for downloading citations document.getElementById('citMgrHelpLink').addEventListener('click', function() { popupHelp(this.href); return false; }); $(".js__slcInclude").on("change", function(e){ if ($(this).val() == 'refworks') $('#direct').prop("checked", false); $('#direct').prop("disabled", ($(this).val() == 'refworks')); }); View Options View options PDF View PDF Figures Tables Media Share Share Share article link Copy Link Copied! Copying failed. 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