赤外線法による溶接止端に発生する疲労き裂の検出と応力拡大係数範囲の評価

概要

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The theromoelastic stress analysis system, which is a stress analysis technique based on the measurement of infrared emission from the surface of a body, was applied to inspection of a fatigue crack initiated at a weld toe in a welded joint and to evaluation of stress intensity factor ranges at crack tips in order to assess the validity of this technique as a nondestructive inspection method. As a result, the fatigue crack was detected from 0.75mm in length by this technique, and the values of crack length estimated from the stress images were agreed with those measured by the optical microscope within 3%. Also, stress intensity factor ranges ΔK evaluated from stress distributions around a crack tip measured by this system coincided with comparable numerical values within 3%.
一般社団法人日本機械学会の論文
2007-11-25