赤外線応力測定における測定精度に及ぼす熱伝導の影響

概要

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An infrared stress analysis technique is relatively a new method based on the measurement of infrared radiation emitted from the surface of a cyclically loaded material. The authors applied this method to evaluate the stress concentration factors for several kinds of notches in the previous study. However, some of the measured values were extremely lower than the comparable values calculated by the FEM. In this study, the sources of the difference between experimental results and numerical values are investigated to improve the accuracy of infrared stress analyses. Since the major source was supposed to be the effect of heat conduction in specimens, the numerical unsteady heat conduction analyses are conducted for three types of similar specimens. According to the comparison between experimental results and numerical values, it is found that the stress distributions in similar specimens differ from each other under the same frequency of cyclic loading due to heat conduction in a specimen and the difference in stress among specimens are remarkable below 10 Hz.
2001-07-25