Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2013.854.861ChuanWang ZhuHongwu WangDingya 62013136Marine 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.]]>Bertini, L., M. Beghini, C. Santus and A. Baryshnikov,2008BSI,1993Buitrago, J., M.S. Weir and W.C. Kan,2003DnV,1984Dickerson, T.L.,1997McMaster, F., J. Bowman, H. Thompson, M. Zhang and S. Kinyon,2007Hasegawa, K., K. Sakata, K. Miyazaki and S. Kanno,2002Kerkhof, K., W. Stoppler, D. Sturm and R. Zirn,1990Varma, A.H., B.W. Russell and B. Wallace,1997Varma, A.H., A.K. Salecha, B. Wallace and B.W. Russell,2002Van Wittenberghe, J., P. De Baets, W. De Waele, T.T. Bui and G. De Roeck,2011