Abstract
Boat or yacht hull has been built mainly by FRP composite materials. FRP boat hull manufacturing begins to be restricted after 2000 under international regulation on ocean environment safety. Therefore, alternatives of FRP has been proposed by many boat builders and high strength aluminium is consdiered as its standard material. But, high strength aluminium is very expensive as boat hull material. In this study, Boat hull was built by high density polyethylene and its structural strength was estimated by longitudinal strength test method in small craft. Tensile strength of polyethylene boat hull material is less than tensile strength of FRP boat hull material. But Safety factor of polyethylene boat hull is more than safety factor of FRP boat hull. This results indicate structural integrity and quality control of polyethylene boat is better than FRP boat.
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