THE EFFECT OF CYCLIC STRESS ON THE TRANSITION TEMPERATURE OF STEEL.
Abstract
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 speciments 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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 18, 1949
- Accession Number
- AD0635109
Entities
People
- H. E. Jacques
Organizations
- Massachusetts Institute of Technology