Development of a Self-reference Lock-in Thermography for Remote Nondestructive Testing of Fatigue Crack (1st Report, Fundamental Study Using Welded Steel Samples)

• SAKAGAMI Takahide

  Department of Mechanical Engineering, Osaka University

• NISHIMURA Takashi

  Department of Mechanical Engineering, Osaka University

• KUBO Shiro

  Department of Mechanical Engineering, Osaka University

• SAKINO Yoshihiro

  大阪大学接合科学研究所

• ISHINO Kazushige

  JFE技研

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疲労き裂の遠隔非破壊検査技術の開発（第１報，溶接試験片を用いた基礎的検討）
• 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 ヒロウ キレツ ノ エンカク ヒハカイ ケンサ ギジュツ ノ カイハツ ダイ1ポウ ヨウセツ シケンヘン オ モチイタ キソテキ ケントウ
• 1st Report, Fundamental Study Using Welded Steel Samples
• 第1報, 溶接試験片を用いた基礎的検討

Abstract

In the thermoelastic stress analysis, stress distribution is measured by lock-in infrared thermography, which correlates temperature change due to the thermoelastic effect with reference loading signal. Loading signal from external source, such as load-cell, strain gage or displacement gage, is usually employed as a reference signal in the conventional lock-in technique. 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

Journal

• TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A

  TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A 72 (724), 1860-1867, 2006

  The Japan Society of Mechanical Engineers

Keywords

• Nondestructive Testing
• Self-reference Lock-in Thermography
• Thermoelasticity
• Singular Stress Field
• Crack
• Welded Steel Structure

Details

• CRID: 1390282679454174336
• NII Article ID: 110006153355
• NII Book ID: AN0018742X
• DOI: 10.1299/kikaia.72.1860
• ISSN: 18848338
• ISSN: 03875008
• NDL BIB ID: 8628295
• Web Site: http://id.ndl.go.jp/bib/8628295
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8628295
• Web Site: http://www.jstage.jst.go.jp/article/kikaia1979/72/724/72_724_1860/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed