S-N Curve Model for Assessing Cumulative Fatigue Damage of Deep-Water Composite Riser

2021 ◽  
Author(s):  
Manander Singh ◽  
Dr. Suhail Ahmad ◽  
A. K. Jain
Keyword(s):  
Fatigue Damage ◽  
Deep Water ◽  
Curve Model ◽  
Cumulative Fatigue Damage

S-N Curve Model for Assessing Cumulative Fatigue Damage of Deep-Water Composite Riser

2020 ◽  
Author(s):  
Manander Singh ◽  
Suhail Ahmad ◽  
A. K. Jain
Keyword(s):  
Fatigue Life ◽  
Fatigue Damage ◽  
Deep Water ◽  
Deterministic Model ◽  
Flexural Stress ◽  
Stress History ◽  
Bending Stresses ◽  
Stress Signals ◽  
Cumulative Fatigue Damage ◽  
Related Stress

Abstract Random stress produces fatigue damage due to fluctuation in the presence of high bending stresses gets enhanced and leads to the primary failure of the production composite riser. The main problems with the fatigue deterministic model are related to the fact that not all waves have the same period. The second problem is due to the assumption that all waves are regular and do not into account the stochastic nature of the marine environment. The wave data is provided on a statistical basis. Work attributed to damage related stress distribution and interaction of composite along with integral difficulties in fatigue is challenging task. Resulting flexural stress history is random in nature. The purpose of this study is to present a methodology for assessing cumulative fatigue damage using MATLAB of the deep-water composite riser. The simulation of 12 random sea states is examined for the purpose of estimation of accumulated damage. Using the recommended method by DNV-OS-C501, fatigue life of composite riser is determined for different conditions. Damage induced by stress signals of varying amplitudes is calculated using Palmgren-Miner’s rule. Total fatigue life for stress history is estimated by the summation of damage fractions. Estimation of fatigue damage over riser’s entire service life is done taking into consideration the entire expected sea area. Extreme flexural stress random fluctuations are estimated with and without currents.

Fatigue Life Assessment of Crane Reel

2011 ◽  
Vol 383-390 ◽  
pp. 2941-2944
Author(s):  
Wei Ming Du ◽  
Fei Xue
Keyword(s):  
Finite Element Method ◽  
Fatigue Life ◽  
Fatigue Damage ◽  
Residual Life ◽  
Life Assessment ◽  
Life Estimation ◽  
Fatigue Life Assessment ◽  
Weld Fatigue ◽  
Simulation Results ◽  
Cumulative Fatigue Damage

The crane reel is generally manufactured by section welding method when the diameter is over 380mm. With the cumulative fatigue damage principle which is based on stress S-N curve, the fatigue damage of one crane reel is analyzed by finite element method, the reel weld fatigue strength and fatigue life are calculated, and the simulation results are proved to be reliable. This method provides an efficient reference for crane reel design and residual life estimation.

Sign in / Sign up

Export Citation Format

Share Document