Stress intensity factors and weight function for internal surface faults in cylindrical vessels

Yanling Ni, Shangtong Yang, Chun-Qing Li

Research output: Contribution to journalArticle

Abstract

Failure of cylindrical vessels can be caused by stress singularity at pitting corrosion induced cracks. Literature suggests that most of research focuses on how to determine stress intensity factors for surface cracks with low aspect ratios, i.e.,a/c1.0. Situation may well arise where the aspect ratio of cracks is larger than one. This paper attempts to propose a weight function method to determine stress intensity factors for high aspect ratio semi-elliptical cracks in cylindrical vessels. The weight functions are derived based on three dimensional finite element analysis. The proposed weight function method is verified numerically. It is found that the higher the aspect ratio of cracks the larger the stress intensity factors, and that the aspect ratio of cracks may alter the failure mode of cylindrical vessels.
Original languageEnglish
Pages (from-to)209-215
Number of pages8
JournalAdvanced Materials Research
Volume705
DOIs
Publication statusPublished - 13 Jun 2013

Keywords

  • weight function
  • finite element
  • stress intensity factor
  • influence coefficient
  • internal surface faults
  • cylindrical vessels

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