Stress intensity factors for an edge crack interacting with an embedded parallel crack for a finite plate under pure bending

Qin Ma, Mordechai Perl, Cesar Levy

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

2 Scopus citations


Parallel cracks are often detected in components under 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 cracks or separate multiple cracks for Fitness-for-Service Criteria. Such standards are very different from one another for the adjustment of multiple nonaligned cracks in existing sources. Furthermore, those criteria and standards are often derived from on-site service experience without rigorous and systematic verification. Based on this observation, in this study, we investigate stress intensity factors of an edge crack in a finite plate under pure bending when interacted by an imbedded parallel crack. Different criteria and standards are then used to correlate the present results in order to recommend the usage of those standards for the purpose of Fitness-for-Service and to classify the standards as either conservative or non-conservative. If H and S represent the vertical gap and horizontal separation distance between the cracks, respectively, and a2 is the length of the crack, a parametric study of parallel crack separation distance and gap on the crack stress intensity factor has been undertaken. The parallel cracks are practically located within the tensile bending stress regime only. Stress intensity factors (SIFs) have been acquired for a wide range of the normalized horizontal gap of S/a2 = 0.4~2.0 and the normalized separation distance of H/a2 = -0.5~2.0 between the two parallel cracks based on the principle of linear elastic fracture mechanics (LEFM). Our 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 publicationCodes and Standards
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791858929
StatePublished - 1 Jan 2019
EventASME 2019 Pressure Vessels and Piping Conference, PVP 2019 - San Antonio, United States
Duration: 14 Jul 201919 Jul 2019

Publication series

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


ConferenceASME 2019 Pressure Vessels and Piping Conference, PVP 2019
Country/TerritoryUnited States
CitySan Antonio

ASJC Scopus subject areas

  • Mechanical Engineering


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