In this study, optimum design algorithm for composite ship structures is applied to a 52-ft. yacht to conduct comparative analyses by life cycle assessments, through which a material design method is proposed to cope with environmental regulation of the ship. Through the case study, the weight of the ship was reduced, and life cycle assessments of the original and lightweight vessels were performed using SimaPro 8. Weight was reduced by 10.47%. Also, at ‘In Production’, global warming and ozone layer depletion indicators decreased by 26.3 and 42.9%, respectively. At ‘In Use’, global warming and ozone layer depletion indicators decreased by 3.81%, with the ship operating for 20 years. Environmental impact of unit weight glass fiber and resin (raw materials used in composite structures) were compared. It was found that resin has higher impact on global warming and ozone depletion than glass fiber by factors of two and eight, respectively. Consequently, it was confirmed that a material design that preferentially reduces content of resin improves the eco-friendly performance of the composite ship.
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