首页|Frequency Domain Fatigue Evaluation on SCR Girth-Weld Based on Structural Stress
Frequency Domain Fatigue Evaluation on SCR Girth-Weld Based on Structural Stress
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原文链接
NETL
NSTL
万方数据
维普
The Steel Catenary Riser(SCR)is a vital component for transporting oil and gas from the seabed to the floating plat-form.The harsh environmental conditions and complex platform motion make the SCR's girth-weld prone to fatigue failure.The structural stress fatigue theory and Master S-N curve method provide accurate predictions for the fatigue damage on the welded joints,which demonstrate significant potential and compatibility in multi-axial and random fatigue evaluation.Here,we propose a new frequency fatigue model subjected to welded joints of SCR under multi-axial stress,which fully integrates the mesh-insensitive structural stress and frequency domain random process and transforms the conventional welding fatigue technique of SCR into a spectrum analysis technique utilizing structural stress.Besides,a full-scale FE model of SCR with welds is established to obtain the modal structural stress of the girth weld and the frequency response function(FRF)of modal coordinate,and a biaxial fatigue evaluation about the girth weld of the SCR can be achieved by taking the effects of multi-load correlation and pipe-soil interaction into account.The research results indicate that the frequency-domain fatigue results are aligned with the time-domain results,meeting the fatigue evaluation requirements of the SCR.
NETL
NSTL
万方数据
维普
