merged

Fatigue Crack Propagation Prediction for Spar Platform
Nur Eliza Marlina Binti Mohd Hanapi
Supervisor: Prof. Dr. Wan Mohd Norsani Bin Wan Nik
Bachelor of Applied Science (Maritime Technology)
School of Ocean Engineering
Universiti Malaysia Terengganu
SPAR platform is a type of offshore oil platform used to extract and process oil from
the deep sea which is cylindrically constructed. The large cylinder structure is used to
stabilize the platform and helped to maintain its position in the water. However, the
platform is exposed to drastic changes in seas and long-term wave loads. The main
source of fatigue damage is wave induced stresses. Thus, this paper analyses crack
propagation using a spectral-based fracture mechanics approach that combines
hydrodynamic response analysis, spectral stress intensity factor calculation, load
spectrum and fatigue-crack propagation model. Besides, AQWA is used to obtain the
response amplitude operators (RAOs) and wave loads for the platform. Quasi-static
method has been adopted in this paper for analyses response of the SPAR platform in
waves. Hence, the unique curve model is introduced and the crack growth for the
platform can be predict.
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