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Article type: Cover
Pages
Cover1-
Published: August 20, 1960
Released on J-STAGE: February 24, 2018
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Article type: Cover
Pages
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Published: August 20, 1960
Released on J-STAGE: February 24, 2018
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Seiichi KOSEKI, Yukio SAKAE, Yukio ENDO
Article type: Article
Pages
1-11
Published: August 20, 1960
Released on J-STAGE: February 24, 2018
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Authors investigated some phenomena of paint-film blisters on ship bottom hulls, and obtained experimental data about these blister formations and their characteristics. From these results, we recognized that cathodic currents might produce paint-film failures. So, we experimented various marine tests for several paints and painting systems with cathodic protection. Results of our investigation are as follows: (1)Proper cathodic potential for oil-base paint-films was -900mV, and -1,000mV for vinyl-resin base paint-films (refered to Cu/CuSO_4 electrode). (2)Cathodic current dnsities for active ships would require 10∼15 mA/m^2. (3)Millscale on hull-plates should be removed, and good results were not obtained from our experiments on Bituminous paint systems. (4)Anti-fouling action of A/F paints was not effected by protective currents in actual sea water immersion tests.
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Kazuo ITO
Article type: Article
Pages
12-16
Published: August 20, 1960
Released on J-STAGE: February 24, 2018
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In the previous paper (Journal of this Society, No.92, Dec.1959) the author has introduced the new method of finding cavitation limit of marine screw propellers by using Gutsche's wind tunnel results. After that he tried to find the relation between ζ_a and σ for the cavitation criterion by a proper analysis of actual trial results of ships and obtained the following relation [numerical formula] This relation is in good agreement with that obtained from Gutsche's and Schoen-herr's diagram (as shown in Fig.4). The actual application of this new theory is also explained by a numerical example.
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Kazuo TERAZAWA, Midori OTANI, Toshio YOSHIDA, Kiyoshi TERAI
Article type: Article
Pages
17-28
Published: August 20, 1960
Released on J-STAGE: February 24, 2018
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In order to investigate the characteristics of fracture stress curve of steel by notched bar tension specimen, it is first needed to clarify the range of notch shapes which would cause an initial crack at the center of notched section, not at the contour. Authors carried out the extensive experiments and obtained the results, which are summarized as follows : (1)Initiation of center crack of fibrous type could be observed after sectioning longitudinally the specimens which were strained and unloaded just before their fracture by means of very careful and minute adjustment of load using a rigid and small tension testing machine of screw type (capacity, 5 tons)(cf. Figs. 2∼5). (2)It was proved that "rim effect" could be recognized conspicuously on the flow stress curve of the specimen in which the center crack was initiated. By observing this rim effect, range of notch shapes that would initiate center crack was determined in detail as shown in Fig. 13. (3) It was also proved that no contour crack was found in the case where center crack would initiate and that this phenomenon could also be saind in the reverse way. Moreover it was observed that contour crack grew slowly in comparatively a long period and was quite stable, and that on the contrary, center crack was very unstable and accordingly the specimen broke just after its initiation. The fracture mode was shear at the contour in almost all specimens and fibrous at the center. (4)It was suggested that micro metallurgical defects of steel might strongly influence on fhe initiation of ductile crack.
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Masayuki YAMAMOTO
Article type: Article
Pages
29-38
Published: August 20, 1960
Released on J-STAGE: February 24, 2018
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The problem of thermal stress has been discussed on the elastic body under Hooke's law and many essays have been developed. The author discusses the problem on pseudo elastic bodies such as cast iron, and develops the fundamental equation of thermal stress in the Cartesian, spherical and cylindrical coordinates under the assumptions of (1) the relation of stress and strain given by Cox and Lang's hyperbola previously introduced by Dr. Kakuzen, (2) strains due to stresses being able to be superposed, and (3) the Poisson's ratio being constant. The author calculates the three dimensional stress problem on a thick cylinder with temperature difference between the inner and outer surfaces and with uniform hydraulic pressure on these surfaces.
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[in Japanese]
Article type: Article
Pages
39-45
Published: August 20, 1960
Released on J-STAGE: February 24, 2018
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[in Japanese]
Article type: Article
Pages
46-49
Published: August 20, 1960
Released on J-STAGE: February 24, 2018
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[in Japanese]
Article type: Article
Pages
50-75
Published: August 20, 1960
Released on J-STAGE: February 24, 2018
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Article type: Appendix
Pages
76-
Published: August 20, 1960
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Article type: Appendix
Pages
App1-
Published: August 20, 1960
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Article type: Appendix
Pages
App2-
Published: August 20, 1960
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Article type: Appendix
Pages
App3-
Published: August 20, 1960
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Article type: Appendix
Pages
App4-
Published: August 20, 1960
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Article type: Appendix
Pages
App5-
Published: August 20, 1960
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Article type: Appendix
Pages
App6-
Published: August 20, 1960
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Article type: Cover
Pages
Cover3-
Published: August 20, 1960
Released on J-STAGE: February 24, 2018
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