Defects and damage in a structural joint can trigger a critical degradation or collapse of the structure. Among joints, welded joints have many uncertainties, such as remaining stress, initial defects, and heat-affected zone. Such uncertainties in a welded joint can also induce a strain fluctuation, when they are subjected to a load. Conversely, the strain fluctuation along the weld line may represent the presence of uncertainties in the welded joint. This means that monitoring strain distribution along the weld line can be good way to assess their integrity and improve reliability of the structure. We have developed a novel distributed strain measurement technique which can measure strain distributions along fiber Bragg gratings (FBG) in an optical fiber and has the high spatial resolution and we applied it to strain monitoring of a welded tubular joint. The spatial resolution o is less than 1 mm and it was confirmed by measurement simulations and experiments. Then, we measured the strain distributions along the weld line of the tubular joint of a steel pipe subjected to a tensile load by the developed measurement system. We could successfully measure the development of the strain distribution along the weld line, where the sharply fluctuating strain distributions resulting from some defects were observed. In this paper, we describe the measurement principle and performance of the optical fiber sensor, and then show the results of strain monitoring in the welded joint.
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ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
June 15–20, 2008
Estoril, Portugal
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4822-7
PROCEEDINGS PAPER
Novel Measurement System With Optical Fiber Sensor for Strain Distributions in Welded Tubular Joints
Hideaki Murayama,
Hideaki Murayama
University of Tokyo, Tokyo, Japan
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Kazuro Kageyama,
Kazuro Kageyama
University of Tokyo, Tokyo, Japan
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Kohei Ohara,
Kohei Ohara
University of Tokyo, Tokyo, Japan
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Kiyoshi Uzawa,
Kiyoshi Uzawa
University of Tokyo, Tokyo, Japan
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Makoto Kanai,
Makoto Kanai
University of Tokyo, Tokyo, Japan
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Hirotaka Igawa
Hirotaka Igawa
Japan Aerospace Exploration Agency, Mitaka, Tokyo, Japan
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Hideaki Murayama
University of Tokyo, Tokyo, Japan
Kazuro Kageyama
University of Tokyo, Tokyo, Japan
Kohei Ohara
University of Tokyo, Tokyo, Japan
Kiyoshi Uzawa
University of Tokyo, Tokyo, Japan
Makoto Kanai
University of Tokyo, Tokyo, Japan
Hirotaka Igawa
Japan Aerospace Exploration Agency, Mitaka, Tokyo, Japan
Paper No:
OMAE2008-57713, pp. 439-446; 8 pages
Published Online:
July 27, 2009
Citation
Murayama, H, Kageyama, K, Ohara, K, Uzawa, K, Kanai, M, & Igawa, H. "Novel Measurement System With Optical Fiber Sensor for Strain Distributions in Welded Tubular Joints." Proceedings of the ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. Volume 5: Materials Technology; CFD and VIV. Estoril, Portugal. June 15–20, 2008. pp. 439-446. ASME. https://doi.org/10.1115/OMAE2008-57713
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