A Study of Fatigue Notch Sensitivity of 2014-T and 7075-T at Elevated Temperatures

Citation

Stalk, George (1955) A Study of Fatigue Notch Sensitivity of 2014-T and 7075-T at Elevated Temperatures. Engineer's thesis, California Institute of Technology. doi:10.7907/A948-ZS36. https://resolver.caltech.edu/CaltechETD:etd-01272004-110905

Abstract

This experiment was conducted to investigate the reversed-bending fatigue notch sensitivity of 2014-T and 7075-T at elevated temperatures. Tests were conducted on three configurations of specimens which had external circumferential notches, and on one configuration of un-notched specimens. It was determined that the experimental stress concentration factor for both alloys, at room and elevated temperatures, increases with decreasing notch radius. At room and elevated temperatures, the fatigue notch sensitivity for both 2014-T and 7075-T, generally increases with increasing notch radius. The fatigue notch sensitivity factor and the experimental stress concentration factor for 2014-T increases with temperature, reaches a maximum in the range of 250[degrees]F to 350[degrees]F and then decreases at 400[degrees]F. The experimental stress concentration factor for 7075-T increases almost linearly from room temperature to 400[degrees]F. The fatigue notch sensitivity factor for 7075-T increases almost linearly from room temperature to 400[degrees]F, but only the 0.09 inch radius notch configuration shows a tendency to level off.

Thesis Files