Crack propagation from notches under LCF conditions at room and high temperatures

T. Bui-Quoc; M. Bernard; N. Merah

Crack propagation from notches under LCF conditions at room and high temperatures

T. Bui-Quoc^*, M. Bernard, N. Merah

^*Corresponding author for this work

Research output: Contribution to journal › Conference article › peer-review

1 Scopus citations

Abstract

Crack growth behavior at room temperature and at 600 °C of SS 304 plates with a central circular hole is studied using linear elastic and elastic-plastic fracture mechanics concepts. Due to large local plastic zone at the hole edge, short fatigue crack propagation is strongly affected by closure phenomena, and the extension rate of a short crack could not be adequately expressed in terms of stress intensity factor ΔK. However, parameter ΔK would be appropriate for investigating the behavior of long cracks. Crack acceleration due to temperature increase is discussed and a strain-based normalization factor for ΔK is suggested for long cracks. The J-integral obtained from a finite element analysis is successful in establishing the propagation rate of both short and long cracks; simple power relations exist between da/dN and cyclic J-integral (ΔJ_f) at room temperature and at 600 °C. With the modified J-integral, using the actual flow strain, the temperature effect could be incorporated in the correlation between da/dN and ΔJ_f.

Original language	English
Pages (from-to)	171-178
Number of pages	8
Journal	American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume	306
State	Published - 1995
Externally published	Yes

ASJC Scopus subject areas

Mechanical Engineering

Cite this

@article{2023308437a14ab8b2f10b26f6f3023b,

title = "Crack propagation from notches under LCF conditions at room and high temperatures",

abstract = "Crack growth behavior at room temperature and at 600 °C of SS 304 plates with a central circular hole is studied using linear elastic and elastic-plastic fracture mechanics concepts. Due to large local plastic zone at the hole edge, short fatigue crack propagation is strongly affected by closure phenomena, and the extension rate of a short crack could not be adequately expressed in terms of stress intensity factor ΔK. However, parameter ΔK would be appropriate for investigating the behavior of long cracks. Crack acceleration due to temperature increase is discussed and a strain-based normalization factor for ΔK is suggested for long cracks. The J-integral obtained from a finite element analysis is successful in establishing the propagation rate of both short and long cracks; simple power relations exist between da/dN and cyclic J-integral (ΔJf) at room temperature and at 600 °C. With the modified J-integral, using the actual flow strain, the temperature effect could be incorporated in the correlation between da/dN and ΔJf.",

author = "T. Bui-Quoc and M. Bernard and N. Merah",

year = "1995",

language = "English",

volume = "306",

pages = "171--178",

journal = "American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP",

issn = "0277-027X",

publisher = "American Society of Mechanical Engineers (ASME)",

}

TY - JOUR

T1 - Crack propagation from notches under LCF conditions at room and high temperatures

AU - Bui-Quoc, T.

AU - Bernard, M.

AU - Merah, N.

PY - 1995

Y1 - 1995

N2 - Crack growth behavior at room temperature and at 600 °C of SS 304 plates with a central circular hole is studied using linear elastic and elastic-plastic fracture mechanics concepts. Due to large local plastic zone at the hole edge, short fatigue crack propagation is strongly affected by closure phenomena, and the extension rate of a short crack could not be adequately expressed in terms of stress intensity factor ΔK. However, parameter ΔK would be appropriate for investigating the behavior of long cracks. Crack acceleration due to temperature increase is discussed and a strain-based normalization factor for ΔK is suggested for long cracks. The J-integral obtained from a finite element analysis is successful in establishing the propagation rate of both short and long cracks; simple power relations exist between da/dN and cyclic J-integral (ΔJf) at room temperature and at 600 °C. With the modified J-integral, using the actual flow strain, the temperature effect could be incorporated in the correlation between da/dN and ΔJf.

AB - Crack growth behavior at room temperature and at 600 °C of SS 304 plates with a central circular hole is studied using linear elastic and elastic-plastic fracture mechanics concepts. Due to large local plastic zone at the hole edge, short fatigue crack propagation is strongly affected by closure phenomena, and the extension rate of a short crack could not be adequately expressed in terms of stress intensity factor ΔK. However, parameter ΔK would be appropriate for investigating the behavior of long cracks. Crack acceleration due to temperature increase is discussed and a strain-based normalization factor for ΔK is suggested for long cracks. The J-integral obtained from a finite element analysis is successful in establishing the propagation rate of both short and long cracks; simple power relations exist between da/dN and cyclic J-integral (ΔJf) at room temperature and at 600 °C. With the modified J-integral, using the actual flow strain, the temperature effect could be incorporated in the correlation between da/dN and ΔJf.

UR - https://www.scopus.com/pages/publications/0029425199

M3 - Conference article

AN - SCOPUS:0029425199

SN - 0277-027X

VL - 306

SP - 171

EP - 178

JO - American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP

JF - American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP

ER -

Crack propagation from notches under LCF conditions at room and high temperatures

Abstract

ASJC Scopus subject areas

Fingerprint

Cite this