レーザ超音波による鋼材料の表面開口亀裂深さ監視

カテゴリ: 論文誌(論文単位)

グループ名: 【C】電子・情報・システム部門

発行日: 2011/07/01

タイトル(英語): Depth Monitoring of Open Surface Cracks in Steel by Laser Ultrasound

著者名: 福地　哲生（電力中央研究所　電力技術研究所），緒方　隆志（電力中央研究所　材料科学研究所）

著者名(英語): Tetsuo Fukuchi (Electric Power Engineering Research Laboratory, Central Research Institute of Electric Power Industry), Takashi Ogata (Materials Science Research Laboratory, Central Research Institute of Electric Power Industry)

キーワード: レーザ超音波，開口亀裂，亀裂深さ，オンライン監視，高温部品，表面波　　Laser ultrasound，open crack，crack depth，online monitoring，high temperature component，surface wave

要約(英語): A method to measure the depth of open cracks in steel by laser ultrasound was developed. Surface waves were measured using a specimen with a slant slit whose depth varied continuously from 0 to 5 mm. The results showed that the time delay of the transmitted wave can be used to monitor the crack depth. When the specimen temperature was varied, the time delay varied because of the change in the propagation speed of the surface wave. In order to remove the effect of temperature change, a method using two surface waves was developed. The time delay of the reference wave, which only includes the effect of temperature change, was used to correct the time delay of the transmitted wave, which includes the effects of temperature change and crack depth. This method was shown to be effective in eliminating the effect of temperature change in the range from 25℃ to 500℃

本誌: 電気学会論文誌C（電子・情報・システム部門誌） Vol.131 No.7 （2011） 特集：平成22年電気学会電子・情報・システム部門大会

本誌掲載ページ: 1275-1280 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejeiss/131/7/131_7_1275/_article/-char/ja/