Notch and temperature effects on crack propagation in ss 304 under lcf conditions

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

doi:10.1115/1.2883666

Notch and temperature effects on crack propagation in ss 304 under lcf conditions

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

Research output: Contribution to journal › Article › peer-review

12 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, the 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 Jintegral, 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)	42-48
Number of pages	7
Journal	Journal of Pressure Vessel Technology, Transactions of the ASME
Volume	121
Issue number	1
DOIs	https://doi.org/10.1115/1.2883666
State	Published - Feb 1999

ASJC Scopus subject areas

Safety, Risk, Reliability and Quality
Mechanics of Materials
Mechanical Engineering

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title = "Notch and temperature effects on crack propagation in ss 304 under lcf conditions",

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, the 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 Jintegral, using the actual flow strain, the temperature effect could be incorporated in the correlation between da/dN and ΔJf.",

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T1 - Notch and temperature effects on crack propagation in ss 304 under lcf conditions

AU - Merah, N.

AU - Bui-Quoc, T.

AU - Bernard, M.

PY - 1999/2

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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, the 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 Jintegral, 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, the 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 Jintegral, using the actual flow strain, the temperature effect could be incorporated in the correlation between da/dN and ΔJf.

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JF - Journal of Pressure Vessel Technology, Transactions of the ASME

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Notch and temperature effects on crack propagation in ss 304 under lcf conditions

Abstract

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