Detection of Through-Deck Type Fatigue Cracks in Steel Deck by Self-reference Lock-in Thermography

• IZUMI Yui

  Department of Mechanical Engineering, Graduate School of Engineering, Osaka University

• SAKAGAMI Takahide

  神戸大学大学院工学研究科

• KUBO Shiro

  Department of Mechanical Engineering, Graduate School of Engineering, Osaka University

• TAMAKOSHI Takashi

  国土技術政策総合研究所

Bibliographic Information

Other Title

• 自己相関ロックイン赤外線サーモグラフィ法による鋼床版デッキ貫通型疲労き裂の検出
• ジコ ソウカン ロックイン セキガイセン サーモグラフィホウ ニ ヨル コウ ショウバン デッキ カンツウガタ ヒロウ キレツ ノ ケンシュツ

Abstract

A new remote nondestructive inspection technique, based on thermoelastic temperature measurement by infrared thermography, is developed for detection and evaluation of fatigue cracks propagating from welded joints in steel bridges. Fatigue cracks are detected from localized high thermoelastic temperature change at crack tips due to stress singularity under variable loading from traffics on the bridge. Self-reference lock-in data processing technique is developed for the improvement of signal/noise ratio in the crack detection process. The technique makes it possible to perform correlation processing without an external reference signal. In this paper, self-reference lock-in thermography is applied for crack identification based on the detection of the singular stress field in the vicinity of crack tips. Experiments are conducted using steel deck specimen, which simulates an actual steel bridge using steel deck in crack propagation test. It is found that significant stress concentration zone can be observed near the crack front, which enabled us to detect through deck type fatigue cracks.

Journal

• TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A

  TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A 76 (766), 723-729, 2010

  The Japan Society of Mechanical Engineers

Keywords

• Thermoelastic Stress Measurement
• Self-reference Lock-in Thermography
• Experimental Stress Analysis
• Nondestructive Inspection
• Fatigue
• Steel Deck

Details

• CRID: 1390001204478386432
• NII Article ID: 110007642518
• NII Book ID: AN0018742X
• DOI: 10.1299/kikaia.76.723
• ISSN: 18848338
• ISSN: 03875008
• NDL BIB ID: 10757067
• Web Site: http://id.ndl.go.jp/bib/10757067
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10757067
• Web Site: https://www.jstage.jst.go.jp/article/kikaia1979/76/766/76_KJ00006441031/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed