The interaction between multiple surface cracks is an important consideration in the cracking behavior due to thermal fatigue and stress corrosion cracking. However, it is difficult to evaluate the intensity of the interaction quantitatively because there are many factors such as the relative position, size and geometry of the cracks. Furthermore, the influence of the interaction differs with the crack tip position along the front. In this study, in order to investigate the intensity of interaction, the stress intensity factor (SIF) of interacting semi-elliptical surface cracks was evaluated by the finite element method and finite element alternating method. These methods enable us to evaluate the SIF of interacting cracks for various conditions. The analysis results reveal that the change in the averaged SIF along the crack front caused by coalescence of two cracks can be estimated from the change in the area size. The maximum interaction can be estimated by simple addition of the area size of two cracks regardless of the loading condition and relative crack size. To exclude the conservativeness caused by the current combination rule, new criteria are shown.
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ASME 2005 Pressure Vessels and Piping Conference
July 17–21, 2005
Denver, Colorado, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4188-X
PROCEEDINGS PAPER
Influence of the Interaction on Stress Intensity Factor of Semi-Elliptical Surface Cracks
Masayuki Kamaya
Masayuki Kamaya
Institute of Nuclear Safety System, Inc., Fukui, Japan
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Masayuki Kamaya
Institute of Nuclear Safety System, Inc., Fukui, Japan
Paper No:
PVP2005-71352, pp. 273-280; 8 pages
Published Online:
July 29, 2008
Citation
Kamaya, M. "Influence of the Interaction on Stress Intensity Factor of Semi-Elliptical Surface Cracks." Proceedings of the ASME 2005 Pressure Vessels and Piping Conference. Volume 3: Design and Analysis. Denver, Colorado, USA. July 17–21, 2005. pp. 273-280. ASME. https://doi.org/10.1115/PVP2005-71352
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