Abstract
RECENT investigations of the fatigue characteristics of a wide range of alloys have revealed a discontinuity in the S/N fatigue curves at high-stress levels. Finney1 reports that the discontinuities in extruded high-strength aluminium alloys of Australian manufacture to specifications DTD 683/3 and 2024–T4 involve a shift to shorter fatigue lives at stresses above the discontinuities. These tests were carried out in rotating cantilever machines with notched test pieces (Kt = 1.5), and Finney also showed that the size of the discontinuity increases with increasing rate of cyclic loading in tests within the range 100–1,200 c/min. A similar tendency was observed by Williams and Mitchell2 in rotating cantilever tests of smooth test pieces prepared from weldable aluminium alloy—‘Alcan 3032 WP’. The discontinuities reported for tests on steels3 show an opposite tendency to increased fatigue lives immediately above the discontinuities, and the trend is similar for both a ferritic steel to BS970EN3B and an austenitic stainless steel S130, when smooth test pieces are fatigued in a Rolls-Royce fatigue machine.
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References
Finney, J. M., J. Inst. Metals, 380 (July 1964).
Williams, T. R. G., and Mitchell, P. J., Inst. Sound and Vibration Mem., No. 118 (Southampton Univ.)
Williams, T. R. G., and Abdilla, J. A., The Engineer, 325 (August 28, 1964).
Levy, J. C., and Kanitkar, S. L., J. Iron Steel Inst., 296 (April 1961).
Benham, P. P., and Ford, H., J. Mech. Eng. Sci., 3, 119 (1961).
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WILLIAMS, T., SHURMER, C. Effect of Temperature on the Discontinuity in the S/N Fatigue Curve of a Stainless Steel. Nature 208, 379 (1965). https://doi.org/10.1038/208379a0
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DOI: https://doi.org/10.1038/208379a0
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