The effect of creep damage formulation on crack tip fields, creep stress intensity factor and crack growth assessments

Shlyannikov V., Tumanov A.

FRATTURA ED INTEGRITA STRUTTURALE, vol.11, no.41, pp.285-292, 2017 (ESCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 11 Issue: 41
  • Publication Date: 2017
  • Doi Number: 10.3221/igf-esis.41.38
  • Journal Name: FRATTURA ED INTEGRITA STRUTTURALE
  • Journal Indexes: Emerging Sources Citation Index (ESCI), Scopus
  • Page Numbers: pp.285-292
  • Keywords: Creep damage, Creep SIF, Multi-axial stress function
  • Ankara Haci Bayram Veli University Affiliated: No

Abstract

Fields of stress, strain rate and process zone of a mode I creep crack growth are analyzed by employing damage evolution equations. Damage models for fracture of process zone represented by stress based formulation. Two expressions are presented to describe the stress-sensitive nature of multiaxial rupture behavior. Both damage free and defective creeping solids have been studied. The variation of creep stress and the crack-tip governing parameter in the form of creep In-integral with time and the evolution of creep damage were analyzed by using the FE-model. The effect of the introduced creep stress intensity factor as a function of creep time through the continuum damage mechanics of the creep crack growth are discussed in detail.