Study on dynamic fatigue test method of subsea cable
The submarine cable is subjected to long-term and complex dynamic load during installation and operation,and is prone to fatigue failure.Aimed at the complex dynamic behavior of free spanning subsea cable and the lack of test method simulating the fatigue problem of the seabed separation point,the prototype fatigue device of free spanning subsea cable considering the seabed contact was built in this paper.The fatigue test method of free spanning subsea cable was developed,the measurement method of dynamic strain information of internal fatigue failure occurrence layer was studied.The result shows that:the dynamic fatigue test can accurately simulate the fatigue stress state and restore the structural response of free spanning subsea cable under vibrating load,the error of loading tension was below 15%and the error of loading curvature was below 10%during the test,the errors of stress measurement of lead sheath were below 10%compared to the numerical results.The dynamic fatigue test method proposed in this paper has an important engineering significance for the structural failure verification of subsea cable.
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