ASPECTS CONCERNING THE STRAINS AND STRESSES DEVELOPED IN THE REAR PLATE OF A MOTOR BOAT HULL

Camelia Cerbu
2006 unpublished
In this paper, the rear plate of a motorboat hull made of randomly E-glass fibres reinforced polymeric resin is analysed. A numerical model of the rear plate of a motorboat hull is proposed by using the method of finite elements. Stresses and strains occurred due to the action of the drag force developed by the motor of the boat, were analysed in case of four kinds of composite materials. Then, the strains about three directions in five points of the rear plate of the motorboat hull made of
more » ... at hull made of E-glass / Polylite 440-M880 composite, were measured by using five bonded strain gauges. The experimental strains and theoretical strains measured in the same points on the numerical model, were compared in case of the drag forces of 294.3 N and 392.4 N. The experimental errors were less than 5-6 % (only four errors were between 5 and 6 %). The results lead us to the conclusion that the theoretical model of the rear plate, may be used to optimise it. From rigidity point of view, it is shown that E-glass / epoxy composite material should not be used to manufacture the motorboat hull.
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