Abstract
Fatigue limit estimation based on the dissipated energy measurement using infrared thermography has been getting an increasing attention in various industries. Most of the studies on dissipated energy have been discussed based on the mean temperature rise or irreversible component of heat generation due to energy dissipation. In this study, phase information of energy dissipation was investigated and was applied to the accuracy improvement of dissipated energy measurement for fatigue damage estimation. The material under test is JIS type 316L austenitic stainless steel. The stress ratio R was set to be -1, -0.8 and -0.5. It is found that the phase difference takes certain constant value during significant energy dissipation and unique value corresponding to the stress ratio. It is concluded that band pass phase filtering is effective to the improvement of the measurement of dissipated energy.
