高温ひずみ計によるクリープ損傷オンラインモニタリングシステムの開発

概要

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For residual life assessments of high-temperature parts of boilers, there are problems with accuracy in the late stages of service life, including Type IV damage. During our recent testing, it became clear that the cumulative strain on the surface has a high correlation to the burst life, but, we could not find a microminiature strain gage capable of making highly accurate measurements of strain. We developed the world's first microminiature slide capacitance-type high-temperature strain gage (φ3mm, 600℃ capable, accuracy within ±0.02% [±200μS], and strain range of at least 3%), and developed an on-line monitoring system at the same time. We created residual life assessment software that applied omega method and the Monkman-Grant method; achieved accuracy of approximately ±30%, which is three times that of conventional structural, ultrasonic, and other residual life assessment techniques (30-year history); and succeeded in the development of a revolutionary technique that enables highly accurate, constant observation.
2009-05-25