Design Of High-speed Composite Boat Structure Under Slamming Load And Fabrication On Boat Structure

The development of FRP fast boats can satisfy three demands: the developingdemand of fast shipping and the pleasure actions on the sea, the working requirements ofthe offshore energy exploitation, anti-smuggler and rescue missions, the military offshorepatrol and fast respond at emergency. Although the FRP fast boats can be widely used inmany fields, the present domestic and abroad classifications only emphasize therequirements on the construction design and cannot guarantee the optimum of the hulldesign. Some abroad companies don’t want to share the key design points with the othercompetitors. Therefore, the development of China FRP fast boats must depend on owntechnology. This article is focus on FRP fast boats construction design and manufacture.Considering the boats above30knots mainly bear the slammingload, the main designload of this article is the impact load.Based on the Cohesion model, finite element analysis is performed for the law ofdelamination. During the calculation process, the delamination location of the plate andthe delamination sequence of delamination in thickness direction are studied. Meanwhile,the thickness and ply angle of laminated plate are studied for the effect of delamination,peel strength of the matrix is also investigated in this section.Put forward the concept of the whole ship design of composite structures, and localanti-slamming design is studied in this section. The finite element method is to evaluatethree hull structures, and the calculated results show that foam sandwich structure has thebest performance. In accordance with the structural design, construction1meter longboat structure specimens, the drop test is to elevulate the performation of three structuredesign with the same weight. The results show that foam sandwich structure has the bestperformance of anti-slamming, which mechanical analysis results is confirmed.Meanwhile, mixed woven kevlar fiber and glass can enhance the performance of anti-slamming. The results also show that horizontal stiffeners with artificial secondarybonded aggregate structure lead to discontinuity properties of the structure, largedelamination field occure near horizontal stiffeners.Vacuum assisted resin technology of the hull was studied. During the hull vacuumassisted molding process, resin flow, flow speed and defects are studied in the analysis.According to resin flow, and the design import/export location resin, foam sandwichpanels with vertical stiffeners is successful one-time infusion. Based on curing kineticsmodel and the heat-chemical model, the finite element is performed for temperaturefiled and the degree of cure field during the curing cycle. Based on thermal-elasticmodel, stress and strain field, deformation, are achieved with fininte element analysis. According to the hydrodynamic theory, excellent linear hydrodynamic hull areachieved by drag test pool. The structures are improved for slamming loads by thoughdynamic transient analysis of the hull. And the composite hull was prepared. Drop testshows that the hull with step-fault zone can improve the load capacity of slamming loadwhich is better than the hull. Speed testing is done for the validation of the compositesvessel having70Kn speed.