Evaluation and Monitoring of Initial Core Damage Mechanical effects in Sandwich Longitudinal Stiffeners of Composite Ship Hull Structutre

In this paper, the effects of the presence or initiation of damage in the core of sandwich beams of a ship hull are investigated in terms of variations in mechanical behavior.This type of damages is difficult to detect due to the presence in depth of the laminate and is essential to predict their mechanical effects.As one of the measures of mechanical behavior, the effect of damage characteristics on Hotspots of the structure of longitudinal stiffeners of sandwich beam is determined by the buckling response changes.Firstly, the beam model is simulated through ABAQUS 6-14 finite element software and the Hotspots and their stress states are determined by static analyses. By evaluating the measures of mechanical criteria parameters of the beam structure in Hotspots, initial core damage effects are described as a result of analyses and determination of critical buckling loads.The accuracy and validation of the simulation and analyses results from ABAQUS finite element software has been confirmed by comparing the results of buckling analyses from the software in different modes with the experimental and analytical theory(formula) results.Therefore, by knowing the sensitivity of the structure response to the damage properties, the design of beams and stiffeners in the hull of ships based on damage tolerant philosophy has been possible.