This paper gives the results of a series of tests of the torsional and flexural fatigue strength of specimens of S.A.E. 3140 steel which were tested in air and under a stream of tap water.

Comparative results are given showing the effects of abrupt changes in section with the steel in the hot-rolled condition and also after heat-treatment. The effect of the corrosive action of the stream of water on the fatigue strength of the specimens of various shapes is determined in addition to the effects due to abrupt changes in section and to heat-treatment.

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