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

Izumi, Yoshiharu; Sakagami, Takahide; Mori, Nobuhiko; Kubo, Shiro; Tamakoshi, Takashi

doi:10.1080/09500340.2010.514066

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…In this respect, the author of this paper observed that measurements of dissipated energy emission caused by the generation and motion of slip bands were effective for the prediction of fatigue crack initiation . For crack detection, both a temperature gap detection technique and a thermoelastic stress evaluation technique can be employed . For the evaluation of fatigue crack propagation after crack initiation, a thermoelastic stress measurement technique can then be effectively applied for the full‐field stress distribution measurement around crack tips, followed by a fracture mechanics evaluation .…”

Section: Development Of Life Cycle Ndt and Nde Using Infrared Thermogmentioning

confidence: 99%

“…69,70 For crack detection, both a temperature gap detection technique and a thermoelastic stress evaluation technique can be employed. 43,[71][72][73] For the evaluation of fatigue crack propagation after crack initiation, a thermoelastic stress measurement technique can then be effectively applied for the full-field stress distribution measurement around crack tips, followed by a fracture mechanics evaluation. 74,75 Finally, after the repair or reinforcement of a steel bridge, it is essential to confirm the reduction in the severity of the stress distribution around the defect portion.…”

Section: E V E L O P M E N T O F L I F E C Y C L E N D T a N D N D mentioning

confidence: 99%

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Remote nondestructive evaluation technique using infrared thermography for fatigue cracks in steel bridges

Sakagami

2015

Fatigue Fract Eng Mat Struct

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Long‐standing infrastructure is subject to structural deterioration. In this respect, steel bridges suffer fatigue cracks, which necessitate immediate inspection, structural integrity evaluation or repair. However, the inaccessibility of such structures makes inspection time consuming and labour intensive. Therefore, there is an urgent need for developing high‐performance nondestructive evaluation (NDE) methods to assist in effective maintenance of such structures. Recently, use of infrared cameras in nondestructive testing has been attracting increasing interest, as they provide highly efficient remote and wide area measurements. This paper first reviews the current situation of nondestructive inspection techniques used for fatigue crack detection in steel bridges, and then presents remote NDE techniques using infrared thermography developed by the author for fatigue crack detection and structural integrity assessments. Furthermore, results of applying fatigue crack evaluation to a steel bridge using the newly developed NDE techniques are presented.

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Section: Development Of Life Cycle Ndt and Nde Using Infrared Thermogmentioning

confidence: 99%

Section: E V E L O P M E N T O F L I F E C Y C L E N D T a N D N D mentioning

confidence: 99%

Remote nondestructive evaluation technique using infrared thermography for fatigue cracks in steel bridges

Sakagami

2015

Fatigue Fract Eng Mat Struct

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“…Considering industrial processes, temperatures are commonly measured locally at selected positions within apparatuses, vessels or pipes or at the surface of components. However, monitoring of temperature fields is beneficial to identify critical surface temperatures, to detect thermal shocks and temperature endurance of plant components, and thus, to prevent early safety shutdowns [1–4]. Furthermore, measuring surface temperature fields allows derivation or even reconstruction of inner surface temperature history or internal flow conditions [5,6] and gives indications of process-related temporal material stress or the development of process runaway conditions [7–9].…”

Section: Introductionmentioning

confidence: 99%

Temperature Grid Sensor for the Measurement of Spatial Temperature Distributions at Object Surfaces

Schäfer

Schubert

Hampel

2013

Sensors

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This paper presents results of the development and application of a new temperature grid sensor based on the wire-mesh sensor principle. The grid sensor consists of a matrix of 256 Pt1000 platinum chip resistors and an associated electronics that measures the grid resistances with a multiplexing scheme at high speed. The individual sensor elements can be spatially distributed on an object surface and measure transient temperature distributions in real time. The advantage compared with other temperature field measurement approaches such as infrared cameras is that the object under investigation can be thermally insulated and the radiation properties of the surface do not affect the measurement accuracy. The sensor principle is therefore suited for various industrial monitoring applications. Its applicability for surface temperature monitoring has been demonstrated through heating and mixing experiments in a vessel.

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Monitoring and detection of steel bridge diseases: A review

Cui,

Zhang,

Zhang

et al. 2024

Journal of Traffic and Transportation Engineering (English Edit

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

Cited by 5 publications

References 7 publications

Remote nondestructive evaluation technique using infrared thermography for fatigue cracks in steel bridges

Remote nondestructive evaluation technique using infrared thermography for fatigue cracks in steel bridges

Temperature Grid Sensor for the Measurement of Spatial Temperature Distributions at Object Surfaces

Monitoring and detection of steel bridge diseases: A review

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