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RESEARCH ON THE ROLE OF STRAIN RATE AND TEMPERATURE IN FATIGUE
Summary rept. 1 Nov 1963-Sep 1965
MASSACHUSETTS INST OF TECH CAMBRIDGE
Pagination or Media Count:
This study is concerned with the roles of strain rate and temperature on fatigue behavior. For the purposes of the immediate work pure aluminum and an aluminum - 10 percent zinc alloy were selected. To simplify analyses of the observed behavior, an axial fatigue machine was designed to eliminate strain rate and stress gradients in the specimen cross-section. Strain rates of 5 and 150 percent per minute, strains of or - 1 percent, and temperatures from 80 to 900 F were the variables studied. A number of grain sizes were utilized to evaluate the role of alloy structure. Other strain rates, strains and structures, including two phase systems, are being examined to extend the studies. Thermal fatigue behavior will be examined and the results compared with the present observations in mechanical fatigue.
APPROVED FOR PUBLIC RELEASE