衝撃圧力を受ける薄肉円筒殼の強度に就て

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The strength of thin cylindrical shell subjected to external static pressure has been investigated by Dr. Tokugawa but no research has been made as yet for its strength subjected to impulsive pressure. The author has commenced with the investigation on the characteristics of the impulsive pressure due to underwater explosion of an explosive and made various experiments with explosives of small charges and instruments having necessary precisions, formeriy not well studied, for measuring the impulsive pressure. It was found that the impulsive pressure due to underwater explosion of an explosive continues for a brief period forming solitary sine waves proportional to the diameter of the expiosive or the cube root of the volume of the charge. Then the analysis of the indication of a crusher gauge, which was used widely for its simplicity for measuring implusive pressure although of its defect of ambiguity, was made in regard to the problem of deformation of an elastic body subjected to impulsive pressure. It was acertained that the characteristics of the indication of the crusher gauge obtained from experimental results were in consistence with the theoretical researches. The experiments were further expanded to the study of strength of thin cylindrical shell, making close observation to the fact that the mode "n" of vibration of a cylindrical shell and the number of lobes "n" appearing at the collapsing state of the cylinder subjected to external pressure were a common factor. Considering for the collapsing state of n-th order, the equation p_n (s) =p_n (d)・T_n (t)_<max> gives the critical impulsive pressure, where pn (s) and pn (d) are statical and impulsive pressures respectively and Tn (t)_<max> is the magnification factor of impulse depending upon the relation between the frequency of vibration of the cylinder and the impulsive pressure wave form acting on the cylinder externally. Thus the calculation of the critical impulsive pressure can be made by the use of the above equation selecting "n" to minimize p_n (d). On the other hand, a method of systematic experimental study was made with many model cylinders and explosives of various charges to compensate for the theoretical results by which it was difficult to analyze some complicated conditions in actual case. Hence, it was proved that the experimental results showed the same tendency as the theoretical studies.
社団法人日本船舶海洋工学会の論文

衝撃圧力を受ける薄肉円筒殼の強度に就て

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