外圧を受ける円筒殻の軸対称圧潰強度(その2)

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Collapsing of the circular cylindrical shell under external pressure can be divided into three modes, namely, shell buckling, axisymmetrical collapse (or stress failure) and general instability. In this paper, the load carrying capacity and the behaviors of the shell were investigated when the shell failed in the axisymmetrical collapse. Thirty four models with three bays and twelve models with five bays were tested. Those models were fabricated with machine tools on a mandrel having out side diameter 113 mm, and had the dimensions and the mechanical properties shown in the Table 1. The collapsing pressure of those models obtained from the experiment are shown in Table 2, but twelve models of those resulted in the general instability. On the other hand, the theoretical collapsing pressure of the tested models were calculated by finite element method, and the collapsing pressure of the shell varying systematical]y these characteristics were calculated. The following conclusion were obtained from the experimental result and the calculation. (1) The collapsing pressure of the cylindrical shell under external pressure can be predicted from Fig. 13. (2) The average of the ratio between the experimental result and the theoretical value on the collapsing pressure is 95 percent. (3) The axisymmetrical collapsing pressure is in proportion to yield strength of the material.
社団法人日本船舶海洋工学会の論文