EFFECTS OF NOTCHES AND SALTWATER CORROSION ON THE FLEXURAL FATIGUE PROPERTIES OF STEELS FOR HYDROSPACE VEHICLES

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.

• Corporate Authors:

  Navy Marine Engineering Laboratory

  Annapolis, MD  United States 
• Authors:
  • Gross, M R
  • Czyryca, E J
• Publication Date: 1966-10

Media Info

• Pagination: 42 p.

Subject/Index Terms

• TRT Terms: Corrosion; Fatigue (Mechanics); Fatigue strength; Flexural strength; Notch tests; Repeated loads
• Old TRIS Terms: Corrosion fatigue; Cyclic fatigue
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00015119
• Record Type: Publication
• Source Agency: Defense Documentation Center
• Report/Paper Numbers: MEL-420/66 Res Rpt, SF020-01-05
• Files: TRIS
• Created Date: May 13 2003 12:00AM