Elastic fracture toughness for ductile metal pipes with circumferential surface cracks

Chun-Qing Li, Guoyang Fu, Shangtong Yang

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Abstract

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
Pages (from-to)489-495
Number of pages7
JournalKey Engineering Materials
Volume730
DOIs
Publication statusPublished - 28 Feb 2017
Event2016 International Conference on Material Engineering and Application - Radiance Hotel, Shanghai, China
Duration: 18 Aug 201621 Aug 2016
http://icmea-conf.org/site/

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Keywords

  • elastic fracture toughness
  • circumferential crack
  • plasticity
  • stress intensity factor
  • ductile metal pipes

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