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Journal of Applied Sciences
  Year: 2013 | Volume: 13 | Issue: 6 | Page No.: 854-861
DOI: 10.3923/jas.2013.854.861
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Test System and Model for Fatigue Performance Evaluation of Marine Riser

Wang Chuan, Hongwu Zhu and Dingya Wang

Marine risers that connect the surface floating facilities and the subsea wells are generally made of heavy duty girth welded tubulars. When experience dynamic loads, weld defects can cause the marine risers to fail prematurely due to fatigue cracks initiation. In order to investigate the fatigue performance of marine risers, a fatigue test system was designed. The components of the test setup part and the data measurement part were described. A mathematical model of free massive beam is built to find the natural frequencies and natural modes of the testing specimen of marine riser to guide the test. Adding end masses is an effective method to control the natural modes and stress amplitude. Based on this system, the fatigue performance of a specimen of marine riser with flange joint is evaluated and the principle and process of the test were illustrated. The mathematical model was used to predict the lateral displacement and the bending moment of the excitated specimen. The maximum error between the test and the theoretical results of bending stress is +4.93%, which verified the model. This study brought promotional values for fatigue performance evaluation of marine risers with different welded tubulars and connections.
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How to cite this article:

Wang Chuan, Hongwu Zhu and Dingya Wang, 2013. Test System and Model for Fatigue Performance Evaluation of Marine Riser. Journal of Applied Sciences, 13: 854-861.

DOI: 10.3923/jas.2013.854.861






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