Journal of Zosen Kiokai

[title in Japanese]

[in Japanese], [in Japanese], [in Japanese]

1943 Volume 1943 Issue 72 Pages 5-15
Published: December 30, 1943
Released on J-STAGE: January 22, 2010

DOIhttps://doi.org/10.2534/jjasnaoe1903.1943.5

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[title in Japanese]

[in Japanese], [in Japanese]

1943 Volume 1943 Issue 72 Pages 17-43
Published: December 30, 1943
Released on J-STAGE: September 04, 2009

DOIhttps://doi.org/10.2534/jjasnaoe1903.1943.17

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Ice-Breaker

M. Namba

1943 Volume 1943 Issue 72 Pages 45-99
Published: December 30, 1943
Released on J-STAGE: January 22, 2010

DOIhttps://doi.org/10.2534/jjasnaoe1903.1943.45

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The purpose of this paper is to explain a portion of the experience on design and construction of Ice-Breakers. The author is pleased to express his wish to expect further theoretical and experimental research to be made by the experts on various points mentioned in this paper.

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On the Strength of Thin Shells under Finite Deformation. (1)

Fundamental Theory

Zirô Suhara

1943 Volume 1943 Issue 72 Pages 101-114
Published: December 30, 1943
Released on J-STAGE: January 22, 2010

DOIhttps://doi.org/10.2534/jjasnaoe1903.1943.101

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The general theory of thin shells was formerly investigated by A.E.H. Love, and has been applied to many problems of stability of thin shells and their calculated results compared with the experiments by various investigators. Generally it made clear to be some regular discrepancies between results deduced from Love's theory and the experimental evidences.
Th. V. Kármán pointed out that Love's theory based on infinitely small deformation of shells is not realized in many cases, actual deformations of shells by external or end pressure are so called “durchschlag”, and consequently the stability of thin shells must be discussed taking into account of finite deformation based on non linear differential equations of equilibrium. But his theory has not yet been completed.
The author at first investigated the general theory of elasticity took account of finite displacement, then obtained the general theory of thin shells under large deformation which forms the generalization of Love's thin shell theory, and as its special case fundamental equation of “durchschlag”, lastly showed on the method of derivation of equations refered to some shapes of shells.

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Allowance Thickness of Shell Platings for the Corrosion and Wear considered from the Strength Point-of-view

Yoshihiro Watanabe

1943 Volume 1943 Issue 72 Pages 115-128
Published: December 30, 1943
Released on J-STAGE: September 04, 2009

DOIhttps://doi.org/10.2534/jjasnaoe1903.1943.115

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If the allowance thickness be somewhat constant, independent of the size of the ship, the induced stress, which depends on the thickness of the shell platings, will approach towards some asymptotic value, when the ship's size be made indefinitely large, as the allowance thickness becomes infinitesimally small compared with the thickness, necessary for strength only.
The so-obtained value may be considered as the allowable stresses purely necessary for the strength of the ship. Then, using this value, the thickness necessary only for the strength can be calculated for the ship of usual size, and the allowance thickness for corrosion may be determined. Such a method is applied to the bottom shell platings, and reasonable values for allowance thickness are obtained.

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On a New Method of Electric Arc Welding

S. Akasaki

1943 Volume 1943 Issue 72 Pages 129-134
Published: December 30, 1943
Released on J-STAGE: September 04, 2009

DOIhttps://doi.org/10.2534/jjasnaoe1903.1943.129

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The new method introduced by the author provides for covering of sand all over the electrode on the weld line of the base metal, and completing the welding from the tip to the end of the electrode.

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Results of Some Rolling Experiments on Merchant Ship Models

Hirosi Kato

1943 Volume 1943 Issue 72 Pages 135-160
Published: December 30, 1943
Released on J-STAGE: September 04, 2009

DOIhttps://doi.org/10.2534/jjasnaoe1903.1943.135

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For the purpose of investigating the resistance to the rolling of ships and the apparent moment of inertia, four merchant ship models were made to roll in still water with the moment of inertia varied but with the displacement and the metacentric height kept constant. Experiments on the rolling among waves were also carried ont with these models in their original conditions, the maximum surface wave slope being kept nearly constant for one series of tests. From these experiments it was found that : -
1. The coefficients of passive resistance to the rolling among waves varies with the period of roll or waves;
2. The effective coefficient of equivalent passive resistance assumed to vary as the angular velocity is approximately expressed in the form
α_w=1/T_s (T_s/T_w) ⁿ·δθ_m/θ_m;
3. The apparent moment of inertia of ships rolling among nearly synchronous waves is approximately written as
I_w=I_o {1+ψ (δθ_m/θ_m -α)/1-ψ δθ_m/θ_m T_s²/T_w²};
4. The parameters of the active resistance vary irregularly with the ratio Tw/To, but in general this resistance increases the angle of roll when Tw/To is less than unity and vice versa;
5. The angles of synchronous rolling calculated by neglecting the active resistance are nearly equal to the experimental values.

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[title in Japanese]

[in Japanese]

1943 Volume 1943 Issue 72 Pages 161-195
Published: December 30, 1943
Released on J-STAGE: September 04, 2009

DOIhttps://doi.org/10.2534/jjasnaoe1903.1943.161

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