FRP高速艇船底ロンジ構造部の損傷とその対策

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Using our design manuals which were published, the reason why damages occurred on bottom longitudinal structures of a small high speed FRP boat was examined that the bottom hull is built by G/C Hybrid-FRP, and the bottom longitudinal by GFRP. In the first chapter damages were examined: Damages such as delamination, buckling and fracture were all examined to result from the fact that safety factors fall below required magnitudes when bow accelerations become high. It is, therefore, certified from the view-point of safety factors that why such kinds of damages occurred. In the second chapter the more reasonable safety standards were proposed based upon safe crusing results after repaired, and then in the third chapter another safety standards were discussed which are considered useful as an examination of results due to 2.5 meters dropping tests on the water which are required at the initial design phase. As the safety standard it results that (1) in the second chapter longitudinal deflection coefficient N_L≧250 and bending stress safety factor F_L≧2.5 based upon the beam theory, stress safety factor of flange delamination F_1≧1.5, shear buckling safety factor of hat web F_2≧1.5 and bending buckling safety factor of hat crown F_3≧1.25 based upon the plate theory; (2) in the third chapter N_L≧100 and F_L≧1.25, then F_1, F_2 and F_3 are all the same as in the second chapter. Following our newly proposed safety standard all damages were repaired. Since then, we haven't heard any damage reports occurred while running on the sea.
社団法人日本船舶海洋工学会の論文
1989-08-25

FRP高速艇船底ロンジ構造部の損傷とその対策

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