Abstract
The effects of grain size and zinc content on the notched and unnotched fatigue strength of annealed alpha brasses were studied on rotating-beam fatigue tester. The following results were obtained: (1) The fatigue strength of unnotched specimens depends upon the average grain size and the previously reported experimental equation, is applicable to the relation between the fatigue strength and the grain size for each cycle of alpha brasses. (2) The fatigue strength of unnotched specimen generally increases with zinc content but in the case of increased cycles no appreciable difference can be obtained between yellow brass and cartridge brass. (3) The grain size of specimen has no large effects on the notched fatigue strength. The specimen of finner grain size tends to show lower fatigue strength at 107 cycles than that of coarse grain size. (4) Effect of zinc content on the notched fatigue strength (theoretical stress concentration 3.15) at 108 cycles is not so remarkable as on unnotched specimens and the fatigue strength of notched specimens is slightly increased with their zinc content.
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