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Fatigue Design Data for the Titanium Alloy Ti-6Al-6V-2Sn
KNOLLS ATOMIC POWER LAB SCHENECTADY NY
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FAn investigation was conducted to determine some of the basic fatigue properties of the titanium base alloy Ti-6Al-6V-2Sn in the annealed bar stock form. The basic S-N curves in the cyclic life region from approximately 10exp2 to 10exp6 cycles, the effect of mean stress at lives from 10exp4 to 10exp6 cycles, and the effect of notches on fatigue strength at 10exp6 cycles were established at room temperature and at 6OOF. The test results indicate that this material possesses good unnotched fatigue strength, but has a rather high sensitivity to inean stress and notches. These latter results are as expected because of the materials high ratio of yield to ultimate tensile strength. The test results were analyzed in terms of current design methods. It was found that the effect of mean stress on the unnotched fatigue strength is best described by a parabolic damage law. Values of delta are established for estimating fatigue notch factors for members containing crack-like defects.
APPROVED FOR PUBLIC RELEASE