Approximate elastic-plastic J estimates of cylinders with off-centred circumferential through-wall cracks

Yun-Jae Kim, Do Jun Shim, Nam Su Huh, Young Jin Kim

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

This paper provides approximate J estimates for off-centred, circumferential through-wall cracks in cylinders under bending and under combined tension and bending. The proposed method is based on the reference stress approach, where the dependence of elastic and plastic influence functions of J on the cylinder/crack geometry, the off-centred angle and strain hardening is minimised through the use of a proper normalising load. Based on published limited FE results for off-centred, circumferential through-wall cracks under bending, such normalising load is found, based on which the reference stress based J estimates are proposed for more general cases, such as for a different cylinder geometry and for combined loading. Comparison of the estimated J with extensive FE J results shows overall good agreements for different crack/cylinder geometries and for combined tension and bending, which provides sufficient confidence in the use of the proposed method for fracture mechanics analyses of off-centred circumferential cracks. Furthermore, the proposed method is simple to use, giving significant merits in practice.

Original languageEnglish
Pages (from-to)1673-1693
Number of pages21
JournalEngineering Fracture Mechanics
Volume71
Issue number12
DOIs
Publication statusPublished - 2004 Aug 1
Externally publishedYes

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Plastics
Cracks
Geometry
Strain hardening
Fracture mechanics
Loads (forces)

Keywords

  • Elastic-plastic fracture mechanics
  • J-integral estimation method
  • Off-centre circumferential crack
  • Reference stress approach

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Approximate elastic-plastic J estimates of cylinders with off-centred circumferential through-wall cracks. / Kim, Yun-Jae; Shim, Do Jun; Huh, Nam Su; Kim, Young Jin.

In: Engineering Fracture Mechanics, Vol. 71, No. 12, 01.08.2004, p. 1673-1693.

Research output: Contribution to journalArticle

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N2 - This paper provides approximate J estimates for off-centred, circumferential through-wall cracks in cylinders under bending and under combined tension and bending. The proposed method is based on the reference stress approach, where the dependence of elastic and plastic influence functions of J on the cylinder/crack geometry, the off-centred angle and strain hardening is minimised through the use of a proper normalising load. Based on published limited FE results for off-centred, circumferential through-wall cracks under bending, such normalising load is found, based on which the reference stress based J estimates are proposed for more general cases, such as for a different cylinder geometry and for combined loading. Comparison of the estimated J with extensive FE J results shows overall good agreements for different crack/cylinder geometries and for combined tension and bending, which provides sufficient confidence in the use of the proposed method for fracture mechanics analyses of off-centred circumferential cracks. Furthermore, the proposed method is simple to use, giving significant merits in practice.

AB - This paper provides approximate J estimates for off-centred, circumferential through-wall cracks in cylinders under bending and under combined tension and bending. The proposed method is based on the reference stress approach, where the dependence of elastic and plastic influence functions of J on the cylinder/crack geometry, the off-centred angle and strain hardening is minimised through the use of a proper normalising load. Based on published limited FE results for off-centred, circumferential through-wall cracks under bending, such normalising load is found, based on which the reference stress based J estimates are proposed for more general cases, such as for a different cylinder geometry and for combined loading. Comparison of the estimated J with extensive FE J results shows overall good agreements for different crack/cylinder geometries and for combined tension and bending, which provides sufficient confidence in the use of the proposed method for fracture mechanics analyses of off-centred circumferential cracks. Furthermore, the proposed method is simple to use, giving significant merits in practice.

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