EFFECTS OF NOTCHES AND SALTWATER CORROSION ON THE FLEXURAL FATIGUE PROPERTIES OF STEELS FOR HYDROSPACE VEHICLES
Research and development rept.
NAVY MARINE ENGINEERING LAB ANNAPOLIS MD
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The flexural fatigue behavior of five constructional steels was investigated in air and salt water over a broad life spectrum ranging from 1000 to 100 million cycles. The yield strengths of the steels ranged from 40 to 200 thousand pounds per square inch ksi. The effects of notches having theoretical stress concentrations ranging from 1.3 to 6 were included in this study. General conclusions are 1 both mechanical notches and saltwater corrosion are more damaging in high-cycle fatigue 2 the combined effect of mechanical notches and salt water is greater than either operating independently and 3 the high-cycle saltwater corrosion-fatigue strengths of sharply notched low and intermediate alloy steels are less than 10 ksi beyond 10-million cycles, regardless of the tensile yield strength level. Additional conclusions relative to notch root radius, corrosion characteristics of the steels, and fatigue design curves are presented.
- Marine Engineering