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The results of a Cyear testing program on the notched high-strain fatigue behavior of three low-strength structural steels are summarized. The parameters studied were: type of loading, push-pull and bending; influence of mean stress, completely reversed and zero-to-tension loading; stare-of-stress, flat plates and grooved cylinders; degree of stress concentration, Kt = 1.3 to Kt = 3.3; and temperature, room temperature and 550"~. Notch-root strains were measured and fatigue srrengh reduction factors are derived. A reasonably conservative life calculation procedure for lowcycle fatigue crack initiation in the presence of stress concentration is proposed and recommended for consideration in design.

THE EFFECT OF STRESS CONCENTRATION ON THE LOW-CYCLE FATIGUE OF THREE LOW- STRENGTH STRUCTURAL STEELS AT ROOM TEMPERATURE AND 550$sup 0$F.