On the efficient time domain stress analysis for the rolling chock of an independent type LNG tank targeting fatigue damage evaluation

This paper targets to develop the procedure of stress analysis of the structural details near the rolling chock by using the time domain modal analysis technique where both the contact and friction behavior can be accurately simulated. In order to perform the time domain analysis focused on the contact and friction, the interaction between hull and tank was modeled via Coulomb friction which were combined with modal analysis technique. Modal analysis using the quasi-static deformation modes is chosen as a cost effective time domain simulation method and this is based on the fact that the structural response of the tank, together with hull, is quasi-static. Based on the developed cost effective time domain simulation method, the long-term fatigue analysis procedure for the structural details near the rolling chock and key of independent type tank is targeted to be established. The developed fatigue assessment procedure takes into account, wave induced stresses and both contact and friction induced stresses without loss of accuracy.