-
Article type: Cover
Pages
Cover1-
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Cover
Pages
Cover2-
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Appendix
Pages
App1-
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Etsuji KAJITA
Article type: Article
Pages
1-10
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
The braking method of launching vessels introduced by the author hereinbelow is an entirely new idea derived from the fact that the turning resistance is by far greater than that of straight running. We pull and turn the launching vessels by means of steel wires fastened to the ground at one end, to let the energy of motion of ships be expended by the turning resistance until the vessel come to a standstill while guiding them onto the prearranged course. The author examined the theory of the similarity of model test regarding the braking method and ascertained the effectiveness of the method by conducting experiments on two kinds of models. In this paper, the outline of the method is introduced.
View full abstract
-
Shiro USHIODA
Article type: Article
Pages
11-18
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
We find difficult to examine the quantity of corrosion in tanks of a ship. For an example, when we examine reduction of thickness due to corrosion by drilling many test holes on the structure of the ship, we find that there are great differences in the result of each test. In the analysis of results of corrosion measurements on longitudinal bulkhead, transverse bulkhead, shell and side longitudinals of two oil tankers, the author recognized the significance of these fluctuations by dividing up and downward fluctuations and fluctuations in each tank from that of the whole, and moreover he investigated into significance in the fluctuations between structures. And he regarded the difference between whole fluctuations and these significant ones. As a result of the consecutive investigations, the following conclusions were obtained: 1. Quantity of corrosion in the same ship changes regularly according to up and downward position and location of each tank. 2. In the same ship, there is no essential difference among quantity of corrosion of each structure except shell. 3. As to the variance when the significant fluctuations are teken off, namely, the error, the rate of the fluctuations of corrosion which is the cause of the error is found to be shown by the normal distribution of the standard deviation σ_o=0.32.
View full abstract
-
Toshio HISHIDA, Norio TANAKA
Article type: Article
Pages
19-26
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
A short guidance is proposed as shown in Fig.6. It is based on the stability standards, of Dr. Watanabe, of Dr. Kato and in the stability regulations now in enforcement. Along these standards, the respective stabilities of many test ships had been examined and therefrom a guidance, which points a relation of critical GM/B and f/d, was reduced. These two factors were reserved after selection from several factors which would principally control the stability. GM, B, f and d contained in the ratios are usually obtainable even in fishing vessels who generally have not their stability data. Thus the guidance will be applicable to the fishing vessels as they are or for some time in fulure. A rough scale is as follows; GM/B> 0.07, f/d> 0.18……for vessel with steel bilge keels, GM/B> 0.08, f/d> 0.20……for vessel without bilge keels.
View full abstract
-
Norio TANAKA, Hiroshi KITAMURA, Toshio HISHIDA
Article type: Article
Pages
27-32
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
Experimental data are presented in this paper. The experiments were worked out by many students of our University in these several years. Rolling resistance of ship models without bilge keels were measured. Four models are related to the present report. The particulars and the test conditions are tabulated in Tables 1-4. The conditions count 220 in total. Together with the data reanalysed from the previous experiments on a cargo ship and an oil tanker, which had been presented in the Journal No.105 of the Society, a series of experiments on general ship form has been got through. In this report, the N-coefficient means N=Δθ/θ_m^2, where Δθ=angle of extinction in degrees due to resistances other than frictional one, θ_m=mean angle of roll in degrees. Δθ is obtained by deducing an angle of extinction due to frictional resistance from a total resistance measured. Frictional one can be calculated by Dr. Kato's formula. The results anaylsed are illustrated in Figs. 1-4. The nomenclatures used are lined up at Section 2. We may draw the following conclusions from these illustrations : 1) N is roughly independent of draft. 2) NZ^n of a particular model is a function of KG/D only. The mean line of NZ^n are superposed in (a) of Fig.6. In this figure, the reanalysed data of the previously reported models are added. 3) They have the minimum values without 0.7-0.8 of KG/D. Heavy curves signify the usual range of KG/D in actual ships. 4) The power index n is a function of Z, which coincides with the Holodilin data. [(b) in Fig.6]. 5) Also it depends on Z only, so long as the present models are concerned. That is to say, the n-curve in (b) is common over the six models. (c) in the same figure is the cross-section at particular KG/D, which is based on the abscissa of C_ν (at d/B=0.4). 6) NZ^n takes the minimum values at about C_ν=0.75. For models finer than this C_ν-value, that is for sharper bottom, NZ^n gets large rapidly. But for ones otherwise it is almost horizontal. The foregoings are data at θ_m=15°. Δθ at θ_m=10° or 20° are plotted against the former in Fig.5. 7) Δθ_<20°> are rather troublesome. But Δθ_<10°> are nearly linear with Δθ_<15°>, and about 2/3 of Δθ_<15°>. In order words, N_<10°> is nearly 1.5 times of N_<15°>. Finally, we add that it may be substituted for N of actual ships without bilge keels by the present data because frictional resistance of actual ships is negligibly small.
View full abstract
-
Yukio UEDA, Wataru YASUKAWA, Masahiro UENISHI, Hajime KAWAKAMI
Article type: Article
Pages
33-40
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
This paper presents the results of theoretical and experimental investigations into inelastic local buckling of welded built-up I-sections with residual stresses under uniaxial compressive loads. Based on the test results on many speciments and the theoretical calculations, the following important matters were pointed out : 1. A newly developed method, the e-δ^2 method, was proposed to determine the critical strain or load of inelastic buckling from test result. When this new method is applied, the critical strain or load is tangiblly indicated without any difficulties and also much less influenced dy individuality than any other methods. 2. The results of numerical calculation showed good agreement with test results. The theoretical calculation is based on the plastic deformation theory and also the assumption that each element of I-section, web or flange, is regarded as a plate with restraint along its support, and the magnitude of restraint is evaluated by the same way as for elastic buckling. 3. According to the results of experiment presented in this paper, such breadth and thickness ratio of web or flange are much smaller than that indicated by G. Haaijer, that the critical strain attains the strain-hardening range without buckling.
View full abstract
-
Yoichiro OKAMURA, Yoshio FUKUMOTO
Article type: Article
Pages
41-48
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
It is a well-known fact that the eccentrically loaded column can sustain a greater load than that at which the maximum fiber stress reaches the yield stress of the material. In this paper, the ultimate strength of eccentrically loaded columns of circular hollow section was calculated and investigations were made into the following items:; 1. the effect of shape of cross section on the ultimate strength, 2. the ratio of the ultimate load to the load at which the maximum fiber stress reaches the yield stress, 3. the range of applicability of this method of calculation of the ultimate strength, with simplified assumption for local buckling, 4. the relation between the ultimate load and weight of the column.
View full abstract
-
Junkichi YAGI, Yukio UEDA
Article type: Article
Pages
49-55
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
In this paper the authors present a new method of analysis on the behavior of steel structures under repeated loading. This kind of problems have been dealt mainly on the basis that impact load can be replaced by a suitable static load. According to this basis, there are some difficulties to explain actual behaviors of structures such as the deformation of a structure under repeated impact loading of constant magnitude is developed and finally reaches a certain definite amount when the magnitude of impact is less than the critical. On contrast with this, the method is based on the concept that the work done by impact load must be equal to the strain energy stored in the structure due to its deformation. This analysis showed that the possible elastic energy to be stored in the structure increases as the plastic deformation becomes larger and consequently when the possible elastic energy becomes equal to the energy of impact loads in magnitude, the deformation does not further proceed. However, if the impact energy is greater than the critical impact energy, the structure will continue to deform under repeated impact loads. The result of analysis was compared qualitatively with the experiment taking into account of the efficiency of impact energy for the deformation.
View full abstract
-
Kazuo TERAZAWA, Junkichi YAGI, Kouji MORIGUCHI
Article type: Article
Pages
56-63
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
In stiffened plates of ship structures, many cracks have been found frequently at their welded parts. In order to clarify causes of occurrence of these damages, fatigue tests were conducted on various fillet-welded specimens and basic data were obtained. Materials which were used for the experiments are mild steel and various kinds of high tensile strength steels of 50kg/mm^2 class to 80kg/mm^2. The fatigue tests were conducted under completely alternative plain bending of constant strain amplitude (ε_a). From these results, the followings were found that the fatigue strength of unsymmetrical fillet-welded specimens has approximately a mean value for plain and symmetrical fillet-welded specimens, the behavior of the elastic fatigue and plastic fatigue are quite different, and the strain amplitude is closely connected with the strain at the highest load under static teosion test.
View full abstract
-
[in Japanese]
Article type: Article
Pages
64-66
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
[in Japanese]
Article type: Article
Pages
67-70
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Appendix
Pages
71-74
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Appendix
Pages
App2-
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Appendix
Pages
App3-
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Appendix
Pages
App4-
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Appendix
Pages
App5-
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Appendix
Pages
App6-
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Appendix
Pages
App7-
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Appendix
Pages
App8-
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Appendix
Pages
App9-
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Cover
Pages
Cover3-
Published: December 30, 1965
Released on J-STAGE: February 25, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
