A LEFM based study on the interaction between an edge and an embedded parallel crack

Q. Ma, C. Levy, M. Perl

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

10 Scopus citations

Abstract

Parallel cracks are often detected in components of various pressurized applications using non-destructive methods. For non-aligned parallel cracks, on-site service needs to decide whether they should be treated as coalesced or separate multiple cracks for Fitness-for-Service. Criteria and standards for the adjustment of multiple nonaligned cracks are very different from one another in existing resources. And those criteria and standards are often derived from on-site service experience without rigorous and systematic verification. Based on this observation, in this study the interaction between an edge and an embedded parallel crack is investigated to correlate criteria and standards from various resources in order to recommend the usage of those standards for the purpose of Fitness-for-service and to classify them as either conservative or non-conservative. If H and S represent the horizontal gap and vertical separation distance, respectively, between the cracks, and a2 is the length of the dominant crack, a parametric study of parallel crack separation distance and gap on the crack stress intensity factor has been undertaken. Stress intensity factors (SIFs) have been acquired for a wide range of the normalized gap of H/a2 = 0.4∼2 and the normalized separation distance of S/a2 = -0.5∼2 between the two parallel cracks based on the principle of linear elastic fracture mechanics (LEFM). This study indicates that certain existing standards/criteria provide results that are much more conservative than others while certain ones do not provide adequate information for application.

Original languageEnglish
Title of host publicationASME 2013 Pressure Vessels and Piping Conference, PVP 2013
DOIs
StatePublished - 1 Dec 2013
EventASME 2013 Pressure Vessels and Piping Conference, PVP 2013 - Paris, France
Duration: 14 Jul 201318 Jul 2013

Publication series

NameAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume3
ISSN (Print)0277-027X

Conference

ConferenceASME 2013 Pressure Vessels and Piping Conference, PVP 2013
Country/TerritoryFrance
CityParis
Period14/07/1318/07/13

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