Ichiro Shiota

Salesian Polytechnic

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Hitoshi Kohri

Kogakuin University

Atsushi Yumoto

Shibaura Institute of Technology

Isao Nishida

Salesian Polytechnic

Naotake Niwa

Shibaura Institute of Technology

Hiroshi Hatta

Tokyo University of Technology

Fujio Hiroki

Keio University

Isao J. Ohsugi

Salesian Polytechnic

Masahiko Katô

Sugiyama Jogakuen University

H.T. Kaibe

Komatsu (Japan)

Osamu Watanabe

Toyo Suisan (Japan)

Cooperative Institutions

Tohoku University

Sorbonne Université

Argonne National Laboratory

Institute of Mathematics and Mathematical Modeling

Australian National University

Advisory Board Company (United States)

University of Pittsburgh

The University of Tokyo

Kogakuin University

Tokyo Institute of Technology

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2725 Tensile Strength of C/C Composites

The proceedings of the JSME annual meeting (2006)

Jun Koyanagi Yurika GOTO Hiroshi Hatta Yasuo Kogo Ichiro Shiota

Strength of carbon-carbon composites (C/Cs) is extremely lower than that of CFRP. One of the main factors of this fact is that the fiber/matrix interfacial strength of C/Cs is too high. The strong interface causes high stress concentration owing to load transfer from broken fibers onto adjacent intact fibers resulting in tensile fracture units into large bundles and low tensile strength in C/Cs. In author's previous work, it has been verified that the C/C with poor interface was improved the tensile strength. This was only qualitative insight, so that the results should be quantified. In this paper, an elementary model describing the C/Cs' tensile fracture is presented. The model has two steps ; 1) the tensile strength of bundle C/Cs is derived from Weibull distribution of the single fiber strength as a function of the bundle thickness, 2) C/C specimen strength is estimated using the bundle strength distribution. Thus, the model expresses the failure stress of C/Cs in terms of the Weibull distribution of the single fiber strength and the size of the fracture bundle. The analytical result show reasonable agreement with the experimental results in spite of several rough assumptions adopted in this model.

Weibull modulus

10.1299/jsmemecjo.2006.1.0_179

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Tribology of Babbitt Metal with Solid Lubricants

Ichiro Shiota Atsushi Yumoto Hitoshi Kohri Naotake Niwa

Babbitt

Metal working

Dry lubricant

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Coating with Supersonic Free-Jet PVD

Materials science forum (2007)

Naotake Niwa Atsushi Yumoto Takahisa Yamamoto Fujio Hiroki Ichiro Shiota

Recently, requirements for structural materials become increasingly severe. A coating is one of the most promising methods to achieve the requirements. However, conventional coating processes generally have technical problems. We apply Supersonic Free-Jet PVD (SFJ-PVD) to coating. The SFJ-PVD is a technique to deposit nanoparticles with supersonic gas flow and to form a thick coating film without a crack or a void. This method is composed of “gas evaporation” and “vacuum deposition”. In a gas evaporation chamber, a source material is evaporated to form nanoparticles in an inert gas atmosphere. The nanoparticles are then carried to a substrate in a deposition chamber with an inert gas flow through a transfer pipe. The gas flow is generated by the pressure difference between the chambers and accelerated through a supersonic nozzle. With SFJPVD, We obtain uniform several hundreds micron meter-thick, high-density coatings.

Inert gas

Inert

Deposition

Physical vapor deposition

10.4028/www.scientific.net/msf.561-565.981

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Research trend of metal base composite materials.

Journal of the Japan Society for Composite Materials (1987)

Ichiro Shiota

Base (topology)

Base metal

10.6089/jscm.13.51

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2318 Interface strength measurement technique for Carbon-Carbon composites

The proceedings of the JSME annual meeting (2005)

Miho ISHII Ken Goto Hiroshi Hatta Ichiro Shiota

The fiber bundle push-out method was proposed as a simple measurement method for inter facial mechanical properties of carbon-carbon composites (C/Cs). Effects from the experimental conditions (size of an indenter, specimen thickness) were investigated in detail. Size of an indenter had strong effect on interface debonding stresses but not on interface sliding stresses. Specimen thickness did not show large influence on the interfacial mechanical properties within the range of less than 400μm. Interfacial mechanical properties of various C/Cs were successfully obtained by the fiber bundle push-out test. The obtained results showed that C/Cs with pith-derived matrices showed large influence of heat treatment temperature on interface bonding strength than C/Cs with resin derived matrices. This tendency could be explained by the difference of increase in number of inter facial debondings by the increase of heat treatment.

Carbon fibers

Reinforced carbon–carbon

10.1299/jsmemecjo.2005.1.0_697

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Analysis of Time-resolved Spectra of Ejecta from Hypervelocity Impacts

JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES (2020)

Yuki Mando Ichiro Shiota Sunao Hasegawa Koji Tanaka

Ejecta from hypervelocity impact includes not only fragments but also luminous vapor cloud with plasma. The plasma (i.e. plasma density) is an important parameter for estimating the risk of discharge on solar array paddle or power harness of spacecraft. We carried out hypervelocity impact experiments using a two-stage light gas gun to analyze luminous vapor cloud and plasma from impacts of the different projectile and target materials. We measured luminous vapor cloud and plasma by using a high-speed video camera and a streak camera spectroscopy, which gives time-resolved spectra and a plasma probe. From the time-resolved spectra, the temperature of the luminous vapor cloud was calculated by fitting the black body radiation from a continuous spectrum of the luminous vapor cloud. Also, we compared and investigated the temporal change of each emission line spectrum from impacts of different target and projectile materials.

Hypervelocity

Streak camera

10.2322/jjsass.68.133

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SiC pc 繊維強化ニッケルの作成と性質

Transactions of the Materials Research Society of Japan (2004)

T Kuwahara H Kohri M Kato T Yagasaki Yukihro Kimura

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Temperature dependence of the figure-of-merit of Ag/sub 0.208/Sb/sub 0.275/Te/sub 0.517/

S. Yoneda Yoshihiro Ohno E. Ohta Nobuhiro Yuhashi Ichiro Shiota

The p-type Ag/sub 0.208/Sb/sub 0.275/Te/sub 0.517/ boule was unidirectionally grown using a Bridgman furnace and subsequently rapidly cooled by Ar to form a Widmannstatten structure of a high temperature phase AgSbTe/sub 2/, which could be desirable for power generation. Though the boule looked a homogeneous Widmannstatten structure, XRD patterns revealed that some precipitates of Ag/sub 2/Te and Sb/sub 2/Te/sub 3/ were contained in the boule and increased in volume in the growth direction. The figure-of-merit Z of the p-type Ag/sub 0.208/Sb/sub 0.275/Te/sub 0.517/ boule have been evaluated in the temperature range from 300 to 700 K. The maximum figure-of-merit Z/sub max/ was different in the portions of the boule. The value of 2.0/spl times/10/sup -1//K was at 620 K for the former half portion of the boule and that of 1.7/spl times/10/sup -3//K was at 585 K for the latter half portion. The Ag/sub 0.208/Sb/sub 0.275/Te/sub 0.517/ boule with less precipitates showed higher Z at higher temperatures.

Figure of Merit

10.1109/ict.2002.1190294

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Effects of alloying elements in aluminum on compatibility between SiC fibres from precursors and the matrices.

Journal of the Japan Society for Composite Materials (1988)

Denis Béchet Ichiro Shiota Osamu Watanabe Sumito Kojima Takahito Shirota

There are two kinds of SiC fibres from precursors. One of them is made from a precursor named polycarbosilane (SiC(PC)>) and the other is made from polytitanocarbosilane (SiC(PTC)). Compatibility between these SiC reinforcements and four different aluminium alloys in composites was investigated. The composites were fabricated by using a squeeze casting technique. All alloying elements, Cu, Si, Mg, Zn, promoted deterioration of the reinforcements. In comparison of the fibres which were extracted from as-fabricated composites, SiC(PC) had a higher strength than SiC(PTC). On the other hand, SiC(PTC) fibre maintained a higher strength than SiC(PC). which were extracted from the heat treated composites.

10.6089/jscm.14.188

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Study on bonding mechanism of carbon fiber/carbon matrix interface in C/C by fundamental model

Hiroki Kurita Hiroshi Hatta Ken Goto Hitoshi Kohri Ichiro Shiota

Carbon fibers

Matrix (chemical analysis)

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