SPECTRAL FATIGUE ANALYSIS OF A SHIP PART 2: USING FEM BASED STRUCTURAL RESPONSES

摘要

The present paper discussed about the Spectral Fatigue Analysis (SFA) using FE based approach to determine Stress Transfer Functions STFs. Full stochastic spectral fatigue analysis is performed through the process of hydrodynamic response analysis, interaction of direct loads to finite element (FE) model, structural analysis and prediction of fatigue damage. As explained in Part-1, one of the most crucial aspect of SFA, is to obtain STFs. Beam theory based STFs are used in Part-1 while FE based structural responses (STFs) are used in PAR.T-2. It is a computationally intense and expensive approach An intermediate compute program is used to transfer the motions and hydrodynamic loads to FE model efficiently. Complexities involved in the load application on FE model are discussed in detail Eventually a comparison of FE based SFA is made with other fatigue assessment approaches as discussed in Part-1 of this paper