On high-frequency fatigue and dynamic properties at elevated temperature

The effects of elevated temperature and high strain rate on fatigue life and tensile properties were measured for annealed 316 stainless steel and titanium alloy 6Al?2Mo?4Zr?2Sn in the solution-heat-treated and aged condition. A 14-KHz magnetostriction oscillator was used for fatigue testing. This equipment was developed for operation in excess of 2000° F. A split Hopkinson pressure bar provided dynamic tensile data up to 1300° F at strain rates on the order of 10³ in./in./sec. An attempt was made to correlate the high-frequency-fatigue data with the dynamic tensile measurements by using the Manson fatiguelife-prediction methods. This paper contains the experimental results and discusses the analysis of these experiments.