GENERAL INSTABILITY OF CYLINDRICAL SHELLS WITH NON-UNIFORM STIFFENERS
TECHNION - ISRAEL INST OF TECH HAIFA DEPT OF AERONAUTICAL ENGINEERING
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The work is a further step towards optimization of stiffened cylindrical shells. Rings and stringers of non-uniform cross-section are analysed as a means of obtaining higher structural efficiencies. For lateral pressure loading, rings with non-uniform height or width are compared. The gain in general instability pressure relative to the uniformly stiffened shell of the same weight amounts to 70-80. For prescribed loading, 10-20 weight savings are obtained. For axially compressed cylinders, stringers with sinusoidal and linear height variation are studied and compared. Gains in load and weight savings of 30 and 10, respectively, are obtained, and the sinusoidal variation is found to be superior to the linear variation. Finally, cylinders under hydrostatic pressure stiffened by a combination of uniform stringers and non- uniform rings are analysed. Different configurations are checked in order to obtain the highest possible efficiencies.