Notch and temperature effects on crack propagation in SS 304 under LCF conditions
- King Fahd Univ. of Petroleum and Minerals, Dhahran (Saudi Arabia). Dept. of Mechanical Engineering
- 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
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