Fatigue tests have been carried out on mild-steel specimens 10-in. wide by 0·3-in. and 1·0-in. thick. Each specimen contained a small central slit to initiate fatigue cracks and measurements of crack length were taken throughout the test. Comparison of the results with those obtained previously on 0·128-in. thick specimens (Frost and Dugdale (I)‡) showed that, for a given loading cycle and crack length, the rate of growth was independent of specimen thickness.
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References
1.
FrostN. E.DugdaleD. S.1957–58J. Mech. Phys. Solids, vol. 6, p. 92, ‘Propagation of fatigue cracks in sheet specimens’.
2.
FrostN. E.1959J. mech. Engng Sci., vol. 1, p. 151, ‘Propagation of fatigue cracks in various sheet materials’.
