Influences of T-stress on constraint effect in mismatched modified boundary layer model for creep crack

Yanwei Dai, Yinghua Liu, Haofeng Chen

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

1 Citation (Scopus)
41 Downloads (Pure)


Constraint effect plays an important role in assessing the stress field and the growth rate of creep crack in components under high temperature. The mismatched modified boundary layer (MMBL) model is extended to creep crack in this paper. For the MMBL model, the Q-parameters for different mismatch factors are studied under different T-stresses. The variation of the dimensionless T-stress in creep zone is given. The variations of open stresses with creep time for different mismatch factors are presented under different T-stresses. The comparisons of Q-parameter between homogeneous material and mismatched materials are made. The influences of mismatch factor on the constraint parameter are discussed. The influence of creep exponent on the open stress is also discussed.
Original languageEnglish
Title of host publicationASME 2016 Pressure Vessels and Piping Conference
Place of PublicationNew York
Number of pages9
Publication statusPublished - 17 Jul 2016
EventASME Pressure Vessels & Piping Conference 2016 - Hyatt Regency Vancouver, Vancouver, Canada
Duration: 17 Jul 201621 Jul 2016
Conference number: 2016


ConferenceASME Pressure Vessels & Piping Conference 2016
Abbreviated titleASME PVP
Internet address


  • creep
  • stress
  • fracture
  • boundary layers
  • mismatched modified boundary layer
  • mismatch factors
  • Q-parameter
  • open stress

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