Detection of fatigue cracks in steel bridges by self-reference lock-in thermography

被引：4

作者：

Izumi, Y. ^{[1
]}

Sakagami, T. ^{[2
]}

Mori, N. ^{[1
]}

Kubo, S. ^{[1
]}

Tamakoshi, T. ^{[3
]}

机构：

[1] Osaka Univ, Grad Sch Engn, Dept Mech Engn, Osaka, Japan

[2] Kobe Univ, Grad Sch Engn, Dept Mech Engn, Kobe, Hyogo 657, Japan

[3] Natl Inst Land & Infrastruct Management, Rd Dept, Bridge & Struct Div, Ibaraki, Japan

来源：

JOURNAL OF MODERN OPTICS | 2010年 / 57卷 / 18期

基金：

日本学术振兴会;

关键词：

nondestructive inspection; thermoelastic stress measurement; self-reference lock-in thermography; fatigue crack; steel bridge; STRESS INTENSITY FACTORS;

D O I：

10.1080/09500340.2010.514066

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A new remote nondestructive inspection technique that is based on thermoelastic temperature measurement by infrared thermography was developed for the evaluation of fatigue cracks propagated from welded joints in steel bridges. Fatigue cracks were detected from localized high thermoelastic temperature changes observed at crack tips induced by stress singularity under variable loading resulting from traffic on the bridge. A self-reference lock-in data processing technique was developed for improving the signal/noise ratio of the thermal images recorded in the crack detection process. In this study, remote and nondestructive detection of fatigue cracks in an actual steel bridge in service was performed by the self-reference lock-in thermography method. The accuracy of this method was improved with a motion compensation technique.

引用

页码：1747 / 1751

页数：5

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