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TECHNICAL PAPERS

Notch-Strengthening Phenomenon Under Creep-Fatigue Loading Conditions

[+] Author and Article Information
N. Merah

Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, P.O. Box 1758, Dhahran 31261, Saudi Arabia

J. Pressure Vessel Technol 122(1), 15-21 (Oct 11, 1999) (7 pages) doi:10.1115/1.556140 History: Received October 19, 1998; Revised October 11, 1999
Copyright © 2000 by ASME
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References

Wundt, B. M., 1972, “Effect of Notches on Low Cycle Fatigue,” A Literature Survey, ASTM STP 490.
Glinka, G., 1988, “Relations Between the Strain Energy Density Distribution and Elastic-Plastic Stress-Strain Fields Near Cracks and Notches and Fatigue Life Calculation,” ASTM STP 942, pp. 1022–1047.
Merah, N., 1994, “Effet d’entailles sur le comportement en fatigue et en fatigue-fluage d’un acier inoxydable,” PhD. thesis, Ecole Polytechnique of Montreal, Montreal, Canada.
Taira,  S., and Ohtani,  R., 1973, “Creep Crack Propagation and Creep Rupture of Notched Specimens,” ASME Conference, 13, pp. 213.1–213.7.
Ohnami, O., Asada, Y., Sakane, M., Kitagawa, M., and Sakon, T., 1988, “Notch Effect on Low Cycle Fatigue in Creep-Fatigue at High Temperatures: Experiment and Finite Element Method Analysis,” Low Cycle Fatigue, ASTM STP 942, ASTM, pp. 1066–1095.
Sakane,  M., Ohnami,  M., Awaya,  T., and Shirafuji,  N., 1989, “Frequency and Hold-Time Effects on Low Cycle Fatigue Life of Notched Specimens at Elevated Temperature,” ASME J. Eng. Mater. Technol., 111, pp. 54–60.
Robinson,  E. L., 1952, “Effect of Temperature Variation on the Long Term Rupture Strength of Steels,” Trans. ASME, 74, pp. 770–780.
Taira, S., 1962, “Lifetime of Structures Subjected to Varying Load and Temperature,” Creep in Structures, N. J., Hoff, ed., Springer Verlag, Berlin, Germany, pp. 96–119.
Coffin, L. F., 1969, “Predictive Parameters and Their Application to High-Temperature Low-Cycle Fatigue,” Proceedings, 2nd International Conference on Fracture, Brighton, UK, pp. 643–654.
Manson, S. S., 1973, “The Challenge to Unify Treatment of High Temperature Fatigue—A Partisan Proposal Based on Strain-Range Partitioning,” ASTM STP 520, American Society of Testing and Materials, pp. 744–782.
ASME, 1986, Boiler and Pressure Vessel Code Case N-47, New York, NY.
Merah,  N., Bui-Quoc,  T., and Bernard,  M., 1994, “A Kt Based Method for Calculating LCF Life of Notched Specimens,” ASME J. Pressure Vessel Technol., 116, pp. 171–179.
Merah, N., Bui-Quoc, T., and Bernard, M., 1995, “Calibration of DC Potential Drop Using an Optical Image Processing System in LCF Testing,” ASTM J. Testing and Evaluation, 23 , 160–167.
Conway, J. B., Berling, J. T., and Stentz, R. H., 1971, “Strain Rate and Hold Time Saturation in Low Cycle Fatigue Behavior,” Proceedings, International Conference on Thermal Stresses and Thermal Fatigue, London, UK, pp. 89–108.
Sakane,  M., and Ohnami,  M., 1983, “A Study of the Notch Effect on the Low Cycle Fatigue of Metals in Creep-Fatigue Interacting Conditions at Elevated Temperature,” ASME J. Eng. Mater. Technol., 105, pp. 75–80.
Hibbit, Karlsson and Sorensen, Inc., 1996, ABAQUS, Version 5.5-1.
Merah,  N., Bui-Quoc,  T., and Bernard,  M., 1999, “Creep-Fatigue Crack Growth in Notched SS-304 Plates at 600°C,” Eng. Fract. Mech., 63, pp. 39–55.
Neuber, H., 1961, “Research on the Distribution of Tension in Notched Construction Parts,” WADD TRGO-906.

Figures

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Notched specimen geometry and dimensions
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σ-Nf curves of notched and unnotched plate specimens of SS 304 at 600°C and ν=1 Hz
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Nf variation with Kt and σ at T=600°C and ν=1 Hz
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Variation of slope m with applied nominal stress
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Variation of parameter A with strain-hardening exponent
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Creep-fatigue life in terms of applied stress for (a)th=1.0 min, and (b)th=5.0 min
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Hold-time effect on the life of smooth plate specimens and notched plate specimens
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Effect of frequency, Kt and σ on the creep-fatigue life of notched plate specimens
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Local stress relaxation and redistribution at notch root plane
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Creep strain cumulation during hold-time
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Cyclic behavior of local stresses in terms of local total strains
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Comparison between the experimental data and the results given by different methods for th=0 min
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Comparison between experimental data and predicted results given by different methods

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