Abstract
The ultrasonic fatigue test is important technique to reveal very high fatigue behavior of engineering materials. Because of resonance phenomenon using technique, testing specimen have stress and strain distribution. This distribution is estimated by theoretical calculation. Actual effective stress distribution, however, may differ from estimated distribution. Therefore, the understanding and measurement of actual distribution is important to this technique. In this study, actual stress distribution measurement is discussed with self-heating distribution measurement by using thermo-graphic measurement. Moreover, specimen shape effects and strain amplitude dependency on stress distribution are also discussed. Finally, thermo-graphic measurement has possibility to describe stress distribution of the ultrasonic fatigue specimen.
