NDLI: Fatigue and Fracture Reliability of Articulated Tower Joint Under Random Loading

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Zaheer, Mohd Moonis Islam, Nazrul
Copyright Year	2009
Abstract	An articulated tower is one of the compliant offshore structures connected to the sea bed through a universal joint. In the random sea environment, this joint is subjected to reversal of shear stresses, which makes it susceptible to fatigue damage. In this study, fatigue damage accumulation in articulated joint under random loading is studied. The dynamic analysis of the tower has been carried out for twelve simulated sea states under random wave alone and random wave with wind. Nonlinearities due variable submergence, instantaneous position of the tower and hydrodynamic loading have been taken into account in the derivation of equation of motion. Fatigue life of the joint has been determined by S-N curve and fracture mechanics (F-M) approaches. Advanced First Order Reliability Method (FORM) and Monte Carlo Simulation method have been used for the reliability estimation. The results of the analyses are presented in terms of probability of failure and reliability indices. Sensitivity analysis is carried out to study the effect and participation of various random variables on the joint reliability. Most probable point (MPP) or design points have been located on the failure surface. Important parametric studies have been carried out which yield important information for reliability based design. The results of the study indicate that Miner’s rule, which is generally used in the design against fatigue in steel structures, yields a conservative estimate of probability of failure as compared to the fracture mechanics approach.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
Starting Page	277
Ending Page	283
Page Count	7
File Format	PDF
ISBN	9780791843420
DOI	10.1115/OMAE2009-79360
e-ISBN	9780791838440
Volume Number	Volume 2: Structures, Safety and Reliability
Conference Proceedings	ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2009-05-31
Publisher Place	Honolulu, Hawaii, USA
Access Restriction	Subscribed
Subject Keyword	Fatigue life Wind Fracture mechanics Seas Sensitivity analysis Dynamic analysis Offshore structures Probability Fatigue Fracture (materials) Equations of motion Steel Waves Seabed Design Fracture (process) Simulation Shear stress Reliability Universal joints Failure Fatigue damage
Content Type	Text
Resource Type	Article

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