High Frequency Fatigue of Metals and Their Cavitation Damage Resistance

摘要

In order to verify the strain rate effects on the correlation between strain energy of metals and their cavitation damage resistance, high frequency fatigue tests at 14.2 kcs were conducted using a magnetostriction oscillator. Utilizing Morrow's theory, it was shown that fatigue at this frequency can be quantitatively predicted if a 15% reduction in static strain hardening factor is made. This result shows that strain rate effects are relatively small when plastic strain energy is used as a criterion. Experiments on corrosion showed fatigue strength can be reduced significantly for SAE 1020 steel in 3% NaC1 solution even at high frequencies. (Author)