初期たわみをもつ円筒殻の胴板座屈圧力 : 第1報
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概要
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An Experimental and analytical invetigation of shell buckling of circular cylindrical shells under hydrostatic pressure was carried out in order to clarify the effect of initial deflection. Fifty-nine models with one bay and two rings, which consisted of 32-models without the initial deflection and 27-models with that, were fabricated with machine tools and were tested. The geometrical characteristics of those models are shown in Table 1. The analyses of shell buckling of those models were carried out by finite element method. The following results were obtained from the experiments and the analyses. 1) It seems, from comparison of the analytical results with the experiments, that the shell buckling strength of the cylindrical shells with fixed ends will be predicted by the finite element method. 2) In the lower range of the thinness factor λ (that is, 0.7<λ<1.0) the buckling strength of the cylindrical shells with the initial deflection being one-half to equel size of the shell thicknness were 30%to 40% Iower than the buckling strength of the perfect cylindrical shells having same geometrical characteristics, but, in the higher range of λ (λ>2.0), the initial deflection did not apeares to be very important. 3) The cylindrical shells, in the lower range of λ (0.7<λ<0.9), could resist to higher pressure than that at which the shell buckling was caused, and those pressure almost equal to the shell buckling pressure of the perfect cylindrical shells having the same geometrical characteristics.
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