抄録
Hereunder is presented a report of the fatigue tests of notched specimens of 0.11% C steel that were conducted under both random and program loads. In performing these tests the electrodynamic type equipment that was previously constructed was reinforced with certain necessary device for the random load fatigue test. It was observed that the fatigue lives under the random and program loads considerably differed from each other, irrespective of the fact that the relative frequency distribution of peak stresses was approximately similar in both of the loads. However, the tendency was observed that in the range of longer life, the lives under both of the loads approached each other. The estimated life based on Miner's rule agreed approximately with the experimental value only in the range of shorter life for the program load. In other cases, the estimation always gave longer lives than the experimental values, and the discrepancy between these values was dominant especially for the random load. Further discussions were made on the relation between the estimated life and the experimental value under the random load, based on the compilation of the results so far reported.
