Elastic fracture toughness for ductile metal pipes with circumferential surface cracks

Chun Qing Li, Guoyang Fu, Shangtong Yang

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

2 Citations (Scopus)


Surface cracks have long been recognized as a major cause for potential failures of metal pipes. In fracture analysis, the widely used method is based on linear elastic fracture mechanics. However, for ductile metal pipes, it has been known that the existence of plasticity results in easing of stress concentration at the crack front. This will ultimately increase the total fracture toughness. Therefore, when using linear elastic fracture mechanics to predict fracture failure of ductile metal pipes, the plastic portion of fracture toughness should be excluded. Otherwise, the value of fracture toughness will be overestimated, resulting in an under-estimated probability of failure. This paper intends to derive a model of elastic fracture toughness for steel pipes with a circumferential crack. The derived elastic fracture toughness is a function of crack geometry and material properties of the cracked pipe. The significance of the derived model is that the well-established linear elastic fracture mechanics can be used for ductile materials in predicting the fracture failure.

Original languageEnglish
Title of host publicationInnovative Materials
Subtitle of host publicationEngineering and Applications II
EditorsJung Kyu Ahn
PublisherTrans Tech Publications
Number of pages7
ISBN (Print)9783038357834
Publication statusPublished - 1 Jan 2017
Externally publishedYes
EventInternational Conference on Manufacturing Engineering and Automation (ICMEA) 2016 - Tin Shui Wai, Hong Kong
Duration: 19 Aug 201621 Aug 2016

Publication series

NameKey Engineering Materials
Volume730 KEM
ISSN (Print)1013-9826


ConferenceInternational Conference on Manufacturing Engineering and Automation (ICMEA) 2016
Abbreviated titleICMEA 2016
CountryHong Kong
CityTin Shui Wai


  • Circumferential crack
  • Ductile Metal pipes
  • Elastic fracture toughness
  • Plasticity
  • Stress intensity factor

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