728 自己相関ロックイン赤外線サーモグラフィ法の開発とき裂モニタリングへの適用(GS-3 欠陥評価,研究発表講演)

概要

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In the thermoelastic stress analysis, stress distribution is measured by lock-in infrared thermography with reference loading signal. In this study, a self-reference lock-in infrared thermography was newly developed, in which a reference signal was constructed by using the same sequential data on thermoelastic temperature change. Temperature change in a region of interest was correlated with that in a remote area for reference signal construction. The lock-in algorithm based on the least squares method was employed for signal processing under random loading. It enabled us to measure the distribution of relative intensity of applied stress under random loading without using any external loading signal. Proposed self-reference lock-in thermography was applied for crack identification based on the detection of significant thermoelastic temperature change due to the singular stress field in the vicinity of crack tips. It was found that significant temperature change was observed at the crack tip in the self-reference lock-in thermal image, demonstrating the feasibility of the proposed technique
一般社団法人日本機械学会の論文
2005-03-18