THE EFFECT OF CYCLIC STRESS ON THE TRANSITION TEMPERATURE OF STEEL

This report concerns an investigation to determine if prior fatigue would affect the transition temperature curves in impact of ship steels. Tests were made on two shipbuilding steels, B and W, the greater amount of work having been done on steel B. A combination fatigue-impact specimen was designed and used. This specimen was round with a circumferential notch and could be tested in impact by sawing off the tapered ends necessary for holding in the fatique machine. As testing proceeded, it was found that fatigue cracks were developing at the base of the notch both above and below the endurance limit. When specimens were cyclically stressed so as to avoid fatigue cracks, the resulting transition curve showed little deviation from the original curve presumably due to the low stress of the prior fatigue. A series of specimens of steel B were prestrained in tension prior to testing in impact with a marked shift of the transition curve resulting. (Author)

• Corporate Authors:

  Massachusetts Institute of Technology

  Center for Transportation Studies, Room 1121
  Cambridge, MA  United States  02139
• Authors:
  • Jacques, H E
• Publication Date: 1949-7-18

Media Info

• Pagination: 45 p.

Subject/Index Terms

• TRT Terms: Cracking; Crash tests; Deformation; Fatigue (Mechanics); Fatigue cracking; Fatigue tests; Fracture mechanics; Materials tests; Repeated loads; Steel; Stresses; Transition point
• Identifier Terms: Ship Structure Committee
• Old TRIS Terms: Fatigue stress; Ship plates; Steel testing
• Subject Areas: Marine Transportation; Materials; Research;

Filing Info

• Accession Number: 00327688
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: SSC- 31 Final Rpt.
• Contract Numbers: NOBS-25391, NOBS-34231
• Files: TRIS
• Created Date: Feb 18 1981 12:00AM