| Tension leg platform(TLP),as a kind of offshore platform suitable for deep and middle sea oil exploitation,its main feature is that the connection between the platform body and the submarine anchorage system through the tendon system,which has good stability.At present,the platform has not been used for oil exploitation in China.The main work of this paper is the structure design of tendon connector and the deep fatigue performance analysis and experimental study of its bearing parts.According to the actual working condition of tendon connector,the structural design of tendon connector is completed.In order to obtain the mechanical properties of the flexible joint more accurately,the flexible joint was designed for the scale reduction model,which facilitated the test verification.Aiming at the calculation and analysis of fatigue life of flexible joint of tension tendon connector,the material parameters of the Yeoh constitutive model of the rubber material were obtained.According to the rubber fatigue analysis method and the crack propagation test of rubber test piece,the expression of rubber fatigue life with crack growth rate and strain energy as variables is established.According to the uniaxial tensile fatigue test of rubber,the ?-N curve is obtained,and the fatigue life of the crack initiation of the flexible joint is obtained.The crack length of the crack propagation to fatigue failure is determined by simulation analysis,and the fatigue life of the flexible joint crack propagation is obtained.The Palmmgren-Miner linear fatigue damage accumulation rule is used to verify that the theoretical calculation life meets the design requirements.In order to accurately verify the fatigue life prediction results of the flexible joint,a new fatigue test device is proposed.The location of the bearing capacity concentration in the mechanical structure of the fatigue test device was studied.The mechanical simulation analysis of the fatigue test device verified the structural strength.Based on the load analysis of the fatigue test,the design of the hydraulic control system was determined.This paper presents the research method of the ground and underwater installation test of the tendon connector.The installation test of the land pool was completed,and the rationality of the tendon connector structure and the feasibility of the installation was verified.The fatigue life prediction result of the flexible joint of tension tendon connectorwas obtained.The fatigue test of the flexible joint is carried out.The theoretical results are analyzed and compared with the experimental results.The accuracy of the fatigue life prediction results was verified.Based on the design of tension-tendon connector structure and the fatigue performance analysis of the load-bearing parts,this paper lays a good foundation for the follow-up research and engineering application of tension-tendon connector on tension-leg platform. |
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