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The Influence of a Non-Aligned Semi-Elliptical Surface Crack on a Quarter-Circle Corner Crack in an Infinitely Large Plate Under Uniaxial Tension

[+] Author Affiliations
M. Perl

Ben Gurion University of the Negev, Beer Sheva, Israel

Q. Ma

Walla Walla University, College Place, WA

C. Levy

Florida International University, Miami, FL

Paper No. PVP2016-63081, pp. V003T03A061; 10 pages
doi:10.1115/PVP2016-63081
From:
  • ASME 2016 Pressure Vessels and Piping Conference
  • Volume 3: Design and Analysis
  • Vancouver, British Columbia, Canada, July 17–21, 2016
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5039-8
  • Copyright © 2016 by ASME

abstract

The evaluation of non-aligned multiple cracks is required in various fitness-for-service codes. For non-aligned parallel cracks, on-site inspection needs to decide whether the cracks should be treated as coalesced or separate multiple cracks for Fitness-for-Service. In the existing literature, criteria and standards for the adjustment of multiple nonaligned cracks are very source dependent, and those criteria and standards are often derived from on-site service experience without rigorous and systematic verification. Based on this observation, the authors previously reported on the effect between an edge and an embedded parallel crack in 2-D scenarios and, more recently, in 3-D scenarios of circular cracks. Since realistic crack configurations detected using non-destructive methods are generally 3-D in nature, the study of 3-D effect of non-aligned cracks with different shapes is deemed necessary in order to obtain more practical guidance in the usage of rules speculated in Fitness-for-Service codes. In this study, a quarter-circle corner crack is considered to interact with a semi-elliptic non-aligned surface flaw in an infinitely large plate under uniaxial tension. While keeping the geometry of the quarter-circle corner crack unchanged, a pair of horizontal (H) and vertical (S) separation distances between the two cracks is chosen followed by a detailed analysis of the effect of crack shape on the 3D SIFs for various embedded semi-elliptical cracks. The analysis is repeated for various combinations of separation distances S and H. The results from this study are collectively significant to the understanding of the correlation between the criteria and standards in Fitness-for-Service community and the consequence of their usage in engineering practice.

Copyright © 2016 by ASME

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