Numerical investigations on the effects of T-stress in mode I creep crack

Yanwei Dai, Yinghua Liu, Haofeng Chen

Research output: Contribution to journalArticle

Abstract

The effects of T-stress on the stress field, creep zone and constraint effect of the mode I crack tip in power-law creeping solids are presented based on finite element (FE) analysis in the paper. The characteristics of the crack tip field in power-law creep solids by considering low negative T-stress and high positive T-stress are studied in the paper. The differences of T-stress effect on the crack tip field between power-law creeping solids and elastoplastic materials are also clarified. A modified parameter is proposed to characterize the influence of T-stress on creep zone. The constraint parameter Q under both small scale creep and large scale creep with various T-stresses for the modified boundary layer (MBL) model and various specimens with different crack depths are given. The applicability and the limitation of the MBL model for creep crack are also investigated. The inherent connection between T-stress and Q-parameter is discussed. The investigations given in this paper can further promote the understanding of T-stress effect and constraint effect on the mode I creep crack.
LanguageEnglish
Number of pages39
JournalInternational Journal of Computational Methods
Publication statusAccepted/In press - 10 Dec 2017

Fingerprint

T-stress
Creep
Numerical Investigation
Crack
Cracks
Crack-tip Field
Crack tips
Power Law
Boundary Layer
Boundary layers
Crack Tip
Elasto-plastic
Stress Field
Finite Element

Keywords

  • T-stress
  • power-law creep
  • constraint effect
  • creep zone
  • finite element method

Cite this

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abstract = "The effects of T-stress on the stress field, creep zone and constraint effect of the mode I crack tip in power-law creeping solids are presented based on finite element (FE) analysis in the paper. The characteristics of the crack tip field in power-law creep solids by considering low negative T-stress and high positive T-stress are studied in the paper. The differences of T-stress effect on the crack tip field between power-law creeping solids and elastoplastic materials are also clarified. A modified parameter is proposed to characterize the influence of T-stress on creep zone. The constraint parameter Q under both small scale creep and large scale creep with various T-stresses for the modified boundary layer (MBL) model and various specimens with different crack depths are given. The applicability and the limitation of the MBL model for creep crack are also investigated. The inherent connection between T-stress and Q-parameter is discussed. The investigations given in this paper can further promote the understanding of T-stress effect and constraint effect on the mode I creep crack.",
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Numerical investigations on the effects of T-stress in mode I creep crack. / Dai, Yanwei; Liu, Yinghua; Chen, Haofeng.

In: International Journal of Computational Methods, 10.12.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Numerical investigations on the effects of T-stress in mode I creep crack

AU - Dai, Yanwei

AU - Liu, Yinghua

AU - Chen, Haofeng

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N2 - The effects of T-stress on the stress field, creep zone and constraint effect of the mode I crack tip in power-law creeping solids are presented based on finite element (FE) analysis in the paper. The characteristics of the crack tip field in power-law creep solids by considering low negative T-stress and high positive T-stress are studied in the paper. The differences of T-stress effect on the crack tip field between power-law creeping solids and elastoplastic materials are also clarified. A modified parameter is proposed to characterize the influence of T-stress on creep zone. The constraint parameter Q under both small scale creep and large scale creep with various T-stresses for the modified boundary layer (MBL) model and various specimens with different crack depths are given. The applicability and the limitation of the MBL model for creep crack are also investigated. The inherent connection between T-stress and Q-parameter is discussed. The investigations given in this paper can further promote the understanding of T-stress effect and constraint effect on the mode I creep crack.

AB - The effects of T-stress on the stress field, creep zone and constraint effect of the mode I crack tip in power-law creeping solids are presented based on finite element (FE) analysis in the paper. The characteristics of the crack tip field in power-law creep solids by considering low negative T-stress and high positive T-stress are studied in the paper. The differences of T-stress effect on the crack tip field between power-law creeping solids and elastoplastic materials are also clarified. A modified parameter is proposed to characterize the influence of T-stress on creep zone. The constraint parameter Q under both small scale creep and large scale creep with various T-stresses for the modified boundary layer (MBL) model and various specimens with different crack depths are given. The applicability and the limitation of the MBL model for creep crack are also investigated. The inherent connection between T-stress and Q-parameter is discussed. The investigations given in this paper can further promote the understanding of T-stress effect and constraint effect on the mode I creep crack.

KW - T-stress

KW - power-law creep

KW - constraint effect

KW - creep zone

KW - finite element method

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