Notch and temperature effects on crack propagation in SS 304 under LCF conditions

Journal Article · Mon Feb 01 04:00:00 EST 1999 · Journal of Pressure Vessel Technology

DOI:https://doi.org/10.1115/1.2883666· OSTI ID:328398

Merah, N ^[1]; Bui-Quoc, T; Bernard, M ^[2]

---

1. King Fahd Univ. of Petroleum and Minerals, Dhahran (Saudi Arabia). Dept. of Mechanical Engineering
2. Ecole Polytechnique, Montreal, Quebec (Canada). Dept. of Mechanical Engineering

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 {Delta}K. However, the parameter {Delta}K 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 {Delta}K 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 ({Delta}J{sub 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 {Delta}J{sub f}.

• OSTI ID: 328398
• Journal Information: Journal of Pressure Vessel Technology, Journal Name: Journal of Pressure Vessel Technology Journal Issue: 1 Vol. 121; ISSN JPVTAS; ISSN 0094-9930
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMBIENT TEMPERATURE
CRACK PROPAGATION
FATIGUE
FRACTURE MECHANICS
STAINLESS STEEL-304
STRESS INTENSITY FACTORS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0400-1000 K