可視―赤外線ハイブリッド計測によるステンレス鋼の散逸エネルギ評価の高度化

抄録

In this study, new energy dissipation evaluation method using visible-infrared hybrid measurement was developed. The dissipated energy is the temperature change due to plastic deformation. In this evaluation method, the temperature change and deformation of specimen which is subjected to the cyclic or random loading are measured by infrared thermography and visible camera. The deformation of specimen is obtained by the digital image correlation (DIC) from visible image, and the change of strain was calculated from the deformation of specimen. The temperature change due to energy dissipation was obtained by comparison between the temperature change measured by infrared thermography and calculated temperature change from time series of strain measured by visible camera and DIC. It is possible to observe the behavior of energy dissipation in detail. This new energy dissipation evaluation method was applied to austenitic stainless steel. From the results, temperature change with double frequency of load signal could be observed. It was found that the amplitude of differential temperature change obtained by new method was coincide with the double frequency component obtained by frequency analysis.