Abstract
Twenty tests were performed on a 1 Cr−1 Mo−1/4 V rotor steel at 1000° F (538°C) to determine the interaction of creep and low-cycle fatigue. These tests involved five different types of strain-controlled cycling: creep at constant tensile stress; linearly varying strain at different frequencies; and hold periods at maximum compressive strain, maximum tensile strain, or both.
The experimental data were then used to characterize the interaction of creep and fatigue by the:
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(1)
Frequency-modified strain-range approach of Coffin;
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(2)
Total time to fracture vs. the time of one cycle relation as proposed by Conway and Berling;
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(3)
Total time to fracture vs. the number of cycles to fracture characterization of Ellis and Esztergar;
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(4)
Summation of damage fractions obtained from tests using interspersed creep and fatigue as proposed by the Metal Properties Council;
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(5)
Strain-range-partitioning method of Manson, Halford, and Hirschberg.
In order to properly assess the strain-range-partitioning approach, seven additional tests were performed at the NASA Lewis Research Center.
Visual, ultrasonic, and acoustic-emission methods of crackinitiation determination were unsuccessful. An approximate indication of crack initiation was obtained by finding the cycle No where the stress-cycle curve first deviated from a constant slope.
Predictive methods (based on monotonic tests) for determining the fatigue life in the creep range were examined and found deficient, though they may still be useful for preliminary comparison of materials and temperatures.
The extension of the frequency-modified strain-range approach to notched members was developed and the results of notched-bar tests were shown to corroborate this approach, when crack initiation for the plain and notched bars was campared.
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References
Manson, S. S., “Fatigue: A Complex Subject-Some Simple Approximations,”Experimental Mechanics,5 (7),93–226 (1965).
Manson, S. S. and Halford, G., “A Method of Estimating High-Temperature Low-Cycle Fatigue Behavior of Materials,” Thermal and High Strain Fatique, The Metals and Metallurgy Trust, London, 154–70 (1967).
Manson, S. S., Halford, G. R., and Hirschberg, M. H., “Creep-Fatigue Analysis by Strain-Range Partitioning,” Symposium on Design for Elevated Temperature Environment, ASME, 12–24 (May 1971).
Coffin, L. F., Jr., “Introduction to High-temperature Lowcycle Fatigue,”High-temperature Low-cycle Fatigue, SESA, Westport, CT, 3–9 (1968).
Coffin, L. F., Jr., “The Effect of Frequency on the Cyclic Strain and Low Cycle Fatigue Behavior of Cast Udimet 500 at Elevated Temperature,”Metallurgical Trans. 12,3105–13 (Nov.1971).
Slot, T., Stentz, R. H. andBerling, T. J., “Controlled-Strain Testing Procedures,” Manual on Low Cycle Fatigue Testing, ASTM, STP 465, 100–128 (1969).
Jaske, C. E. and Mindlin H., “Elevated Temperature Low Cycle Fatigue Behavior of 2-1/4 Cr−1 Mo and 1 Cr−1 Mo−1/4 V Steels,” Symposium on 2-1/4 Chrome 1 Molybdenum Steel in Pressure Vessels and Piping, ASME, 137–210 (1971).
Krempl, E. and Walker, C. D., “Effect of Creep Rupture Ductility and Hold Time on the 1000° F Strain-Fatigue Behavior of a 1 Cr-1 Mo-0.25 V Steel,” Fatigue at High Temperature, ASTM, STP 459, 75–99 (1969).
Conway, J. B. andBerling, J. T., “A New Correlation of Low-Cycle Fatigue Data Involving Hold Periods,”Metallurgical Trans.,1 (1),324–5 (Jan.1970).
Ellis, J. R. and Esztergar, E. P., “Considerations of Creep-Fatigue Interaction in Design Analysis,” Symp. on Design for Elevated Temperature Environment, ASME, 29–33 (May 1971).
Curran, R. M. and Wundt, B. M., “A Program to Study Low-Cycle Fatigue and Creep Interaction in Steels at Elevated Temperatures,” Current Evaluation of 2-1/4 Chrome 1 Molybdenum Steel in Pressure Vessels and Piping, ASME, 49–82 (1972).
Hill, G. J., “The Failure of Wrought 1% Cr−Mo−V Steels in Reverse-Bending High-Strain Fatigue at 550°C,” Thermal and High Strain Fatigue, The Metals and Metallurgy Trust, London, 312–27 (1967).
Coffin, L. F. Jr., “The Effect of Vacuum on the High-Temperature, Low-Cycle Fatigue Behavior of Structural Metals,” General Electric Co. Report No. 71-C-108 (April 1971).
Forrest, P. G., “The Use of Strain Cycling Tests for Assessing Thermal Fatigue Resistance,”Applied Materials Research,4,239 (1965).
Coles, A., Hill, G. J., Dawson, R. A. T. and Watson, S. J., “The High Strain Fatigue Properties of Low-Alloy Creep Resisting Steels, Thermal and High Strain Fatigue, The Metals and Metallurgy Trust, London, 271–94 (1967).
Timo, D. P. and Sarney, G. W., “The Operation of Large Steam Turbines to Limit Cyclic Thermal Cracking,” Paper 67-WA/PWA-4, ASME (Nov. 1967).
Edmunds, H. G. andWhite, D. J., “Observations of the Effect of Cteep Relaxation on High-Strain Fatique,”J. of Mech. Eng. Sci.,8 (3),310–21 (1966).
Halford, G. R., Private Communication on Tests Performed at NASA Lewis Research Center.
Dawson, R. A. T., Elder, W. J., Hill, G. J. and Price, A. T., “High Strain Fatigue of Austenitic Steels,” Thermal and High Strain Fatigue, The Metals and Metallurgy, Trust, London, 239-69 (1967).
Manson, S. S. andHirschberg, M. H., “Crack Initiation and Propagation in Notched Fatigue Specimens,”Proc. First Int. Conf. on Fracture,1,479–98 (1965).
Berling, J. T. andConvay, J. B. “A New Approach to the Prediction of Low-Cycle Fatigue Data,”Metallurgical Trans.,1 (1),805–809 (April1970).
Neuber, H., “Theoretical Determination of Fatigue Strength at Stress Concentration,” Tech. Report AFML-TR-68-20, Wright-Patterson Air Force Base, OH.
Topper, T. H. and Gowda, C. V. B., “Local Strain Approach to Fatigue Analysis and Design,” ASME Paper No. 70-DE-24.
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Leven, M.M. The interaction of creep and fatigue for a rotor steel. Experimental Mechanics 13, 353–372 (1973). https://doi.org/10.1007/BF02324038
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DOI: https://doi.org/10.1007/BF02324038