著者

久保 司郎 井岡 誠司

出版者

社団法人日本材料学会

雑誌

学術講演会講演論文集

巻号頁・発行日

vol.46, pp.109-110, 1997

著者

坂西 明郎 田中 秀次郎

出版者

社団法人日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.17, no.175, pp.326-328, 1968-04-15

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Studies have been made of the dynamic viscoelastic properties of copolymers of styrene (S) and butadiene (B) in toluene (good solvent for both components) at 30.0℃. the polymers were prepared by the "living polymer" method with the same monomer feed ratio of S 61 mol % and B 39 mol %. The two were block copolymers with three sequences of B-S-B (BSB 1101) and S-B-S (SBS 1102), and the one was a random copolymer (SB 1103). The complex rigidities and the steady shear viscosities were measured by means of torsional crystals at the frequencies of 19.6kc, 39.2kc or 40.15kc, and 117.7kc, and a Ubbelohde dilution type viscometer respectively. The intrinsic rigidities and the generalized limiting relaxation times were obtained by extrapolation to zero concentration. The dimensionless functions of intrinsic rigidities were plotted logarithmically against the generalized angular frequencies together with the theoretical curves of Rouse (free-draining case) and Zimm (non-draining case). In these plots, the experimental points lie between the Rouse and the Zimm theory for the two block copolymers and closely on the Zimm theory for the random copolymer. It means that the random copolymer is nearly non-draining, and the block ones are partial-draining; BSB 1101 seems to exhibit the stronger draining effect than SBS 1102 toluene at 30.0℃. Since the draining effects correlate with the volume expansion, it may be suggested that the random copolymer has more compact conformation than the block sorts in such good solvent as toluene.

著者

川村 正晃

出版者

社団法人日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.28, no.313, pp.993-996, 1979-10-15

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The objective of this study is to clarify the effect of the chemical displacement reaction between Sn-Pb solder and ZnCl_2 binary system fluxes containing fluorides or iodides as a second component on the spreadability of Sn-Pb solder. The results obtained are summarized as follows. (1) when ZnCl_2 binary system fluxes containing fluorides such as AgF, BiF_3 and NiF_2 4H_2O or iodides such as AgI, BiI_3 and NiI_2・6H_2O were used, a remarkable chemical displacement reaction between Sn-Pb solder and the fluxes took place and the spread area of the solder with these fluxes was larger than that with pure ZnCl_2 flux. (2) When ZnCl_2 binary system fluxes containing fluorides such as ZnF_2, MnF_2, KF, NaF, LiF and BaF_2 or iodides such as ZnF_2 and CdF_2 Were used, the chemical displacement reaction hardly took place and the spread area was almost the same as that with pure ZnCl_2.

著者

布村 成具 山崎 泰広 大滝 秀治

出版者

社団法人日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.50, no.10, pp.1102-1107, 2001-10-15

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Fatigue characteristics are of fundamental importance when choosing a structural materials, especially when deciding upon the materials for reactor structure where long-term safety is primary importance. In this field, recently, the propagation behavior of mode II and mode III fatigue cracks has attracted special interest. The mode II and mode III fatigue testings involve greater difficulties compared with the mode I testing and the testing procedure has not been established. SS400 carbon steel was fatigue tested by a torsion fatigue testing machine. In the torsion test, fatigue cracks can propagate in all modes. To identify their behavior, surfaces of the specimen were observed by CCD camera and the behavior of surface cracks were recorded in a time-lapse video recorder which can record up to for 40 days. To reveal the morphology of the mode II and mode III Crack propagation, some of test interrupted specimens were sliced and observed by a two dimension measuring microscope. To investigate the crack morphology three dimension crack demonstrate computer program was developed. In the torsion test of plain surface specimen the mode II crack initiates first, but it transits to mode I in the early stage. However, according to the 3D view a large mode III crack propagates into inside in this stage. Persistent slip band like patterns were observed on the surface and the cross section of the fatigue cracked specimen and all mode III cracks propagate in the band. Some of them grew across the center of the specimen. The da/dN – ΔK diagram of the surface mode II fatigue crack propagation was compared with that of mode I by CT type specimen of the same material. Mode II Propagation rate agreed with mode I propagation rate where the stress intensity factor range was converted as ΔK_I= 2ΔK_II. It means that to design the structure by mode I crack propagation data alone may be acceptable under above conversion. To establish this relationship and to elucidate the behavior of mode III fatigue cracking, more investigations are required.

著者

矢野 浩之 椋代 純輔 大西 一広

出版者

社団法人日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.39, no.444, pp.1207-1212, 1990-09-15

被引用文献数

3 8

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The top plate of guitar is usually ismade from two wood species which belong to different genus,that is german spruce (picea abies) and western redceder (Thuja plicata). To clarify the characteristics of these species and of the wood materals for the top plat were measaured by means of free-free flexural vibretion method.The resulta were compared with the evaluation by ezpert of guitar mannufacture.The mean zalues of sapecific dynamic Young's modulus(Ε/γ)and tan δof german spruce were higher than those of western redceder,whileamong various wood species these twe had higher Ε/γand lower tan δ in the longitudinal direstion.These characteristics were particularly pronounced in the specimens which were judged by the ezpert to be high grade.Moreover,the standard deviation of the acouatia properties of the high grade sapecimens were smaller than of the medium or low grade ones regardless of the species. The value of Ε/γin the longitudinal direction,which can be obtained easily,seemed to be a convenient criterion for selecting the wood material suitable for guitar top plate.Because it correlated highly with tan δ in the longitudinal direction,and also with the ratio of tan δ in the radial direction was more appropriate,because the experimental values of Ε/γ and tan δ in any grain angle agreed with the values calaulated based on Hankinson's equation.

著者

高松 洋 生駒 英也

出版者

社団法人日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.53, no.11, pp.1170-1174, 2004-11-15

著者

沢井 郁太郎 田代 仁

出版者

社団法人日本材料学会

雑誌

材料試験 : journal of the Japan Society for Testing Materials (ISSN:03727971)

巻号頁・発行日

vol.6, no.49, pp.638-644, 1957-10-15

著者

斎藤 博

出版者

社団法人日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.40, no.449, pp.249-250, 1991-02-15

著者

守屋 慶隆 太田 晃

出版者

社団法人日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.43, no.491, pp.919-929, 1994-08-15

被引用文献数

3 7

著者

吉田 真悟 橋本 淳 棚橋 満 行本 正雄 武田 邦彦

出版者

社団法人日本材料学会

雑誌

学術講演会講演論文集

巻号頁・発行日

vol.54, pp.436-437, 2005-05-20

出版者

社団法人日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.31, no.351, 1982-12-15

著者

渡辺 孝司

出版者

社団法人日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.28, no.309, pp.529-534, 1979-06-15

被引用文献数

1

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Yield behavior of low-carbon steel sheets (0.07% C) has been examined under the strain rate of 10^<-4> to 10^<-1>/sec at room temperature using an Instron tensile machine. Stress-strain curves have been recorded by using a transient converter (NF, E-5001:8 bits×1024 wards) , since the response of a X-Y, T recorder is not sufficient for the measurements under high strain rates. The experimental results by the transient converter show that the upper and lower yield points appear clearly before the crosshead speed reaches to a given value of high strain rate. The transient converter is found most desirable in order to observe the yield behavior under high strain rates, The results also show another break point of the strain rate dependence of yield stress at the strain rate of 〜3×10-3/sec, which is different from M. J. Manjoin (1944)'s strain rate i.e. 〜10^<-1>/sec. The strain rate dependences of yield stress, yield point elongation, and tensile strength in the range of high strain rate above 〜3×10^<-3>/sec are larger than those at lower strain rates. The yield stress is much more sensitive to the strain rate as compared with the tensile strength.

著者

中野 詔彦 長谷川 澄子 中尾 幸道

出版者

社団法人日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.42, no.480, pp.1072-1076, 1993-09-15

被引用文献数

2

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The effect of reinforcement of elastic modulus in polymer composite materials filled with ultramicroscopic particles has been investigated by taking an example of polymethyl methacrylate-palladium cluster composites.The singularity that makes the elastic modulus increase twice has been indicated by filling up the microscopic fine particles of 10〜20A in spite of a little volume which is 05%.This singularity is caused by the fact that the microscopic particles and the matrix,are perfectly unificated in the materials.The reinforcement of elastic modulus can be explained by the perfect parallel model in consideration of the interface restriction regions.It is clearly shown that such singularity is brought in only by the relative size effect of microscopic particles in such perfect composite materials.

著者

池尻 忠夫

出版者

社団法人日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.16, no.165, pp.394-400, 1967-06-15

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高電圧小電流アークによる劣化の性質を放電形式、電極配置、絶縁材料の種類を種々変えた場合について調べた。そしてアーク劣化ではいくつかの劣化の形式が存在することを明らにした。またその劣化機能についても考察した。その結果、次のような結論を得た。(1)アーク劣化は放電形式により影響されるところが大で、孤光状花火では劣化は大きく、せん光状火花の場合では劣化の程度はきわめて小さく炭化は起こらない。(2)アーク劣化は電極配置により異なり、特異焼損図形を伴いトラッキングにより劣化する場合、電極軸にほぼ直角方向に生成される炭化侵食部を生じ、最終的にはトラッキングに進展する場合、アークの腹により燃焼蒸発を起こし内部に向かい劣化する場合などのいくつかの形式がある。(3)絶縁材料の種類により、劣化は炭化する場合、溶融炭化する場合、溶融するが炭素を遊離しない場合の三つの形式が存在する。そして、絶縁材料の分子構造中のフェニール基の有無やC/H,C/F(個数比)などとこれらの劣化形式がかなり関係あることが推察される。(4)高電圧小電流アークによる劣化では高電界の影響が存在する。

著者

大路 清嗣 中井 善一 塩谷 昇史 久保 司郎 Kacou P.A.T. 根岸 聖司

出版者

社団法人日本材料学会

雑誌

学術講演会前刷

巻号頁・発行日

vol.41, pp.25-27, 1992-05-22

著者

斉藤 秀雄 田中 穆 林 実 鴨先 実 渡辺 忠彦 田中 孝男

出版者

社団法人日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.13, no.132, pp.711-716, 1964-09-15

被引用文献数

1

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Studies were carried out on the improvement of radiographic relative fault sensitivity, and attempts were made to find out a suitable penetrameter in order to establish a technique on the radiographic inspection by X-rays for solid composite propellants up to 400 mm in diameter. The solid rocket propellants have small absorption coefficient for X-rays, so it is necessary to use lower energy X-rays in comparison with the thickness of the metals and to perform the testing in as low W-ray voltage as possible. The relative fault sensitivity thus obtained is 0.5 to 1.0 percent for the solid composite propellants of 400 mm in diameter. It has been found that the hole type penetrameter is the most suitable for the solid composite propellants among various sorts.

著者

佐々木 哲也 酒井 信介 岡村 弘之

出版者

社団法人日本材料学会

雑誌

学術講演会前刷

巻号頁・発行日

vol.38, pp.231-233, 1989-05-23

著者

堀川 教世 中山 英明 境田 彰芳 田中 道七

出版者

社団法人日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.49, no.4, pp.426-432, 2000-04-15

被引用文献数

2 3

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Load-controlled fatigue tests were carried out on PAN-based monofilament carbon fibers under cyclic tensile load conditions at a frequency of 10Hz.Fatigue strength data are obtained under pre-determined maximum load P_max with three different stress ratios of R(=P_mix/P_max)=0.1, 0.5 and 0.7.The maximum load P_max is not an appropriate parameter to evaluate the fatigue strength behavior because the cross-sectional area of monofilament carbon fiber is not constant and varies along the longitudinal direction.This fact results in a large scatter of fatigue lives when the data are plotted on P_max-N_f diagram.In order to evaluate the evaluate the fatigue strength behavior more precisely, the fatigue strength data must be plotted on S-N diagram by using the maximum tensile stress σ_max determined from the crosssectional area of the fracture surface.It is found that S-N properties of monofilament carbon fibers clearly show the fatigue behavior, depending on the stress ratio R.It is also found that the fatigue strength of monofilament carbon fiber is governed by two parameters such as the maximum stress σ_max and the stress amplitude σ_a, and that the combined stress parameter σ_max~(1-α)×σ_a~α is useful to describe the fatigue strength behaviors of the different stress ratios.

著者

桃谷 政順 松本 幸雄

出版者

社団法人日本材料学会

雑誌

材料試験 : journal of the Japan Society for Testing Materials (ISSN:03727971)

巻号頁・発行日

vol.10, no.92, pp.319-321, 1961-05-15

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Experiments have been made with two kinds of O/W type emulsions. Compositions of the emulsions are shown in Table 1. The flow properties of these emulsions and their dispersion mediums have been studied in the range of low rates of shear. Effect of the flow properties due to addition of salts or lower alcohols are also observed. The two kinds of emulsions stated above, reveal different behaviours under shearing stress. One of them (emulsion I) reveals the Newtonian flow in the range of low dispersion concentrations. The other (emulsion II) behaves as the non-Newtonian fluid over all the range of concentrations. In the former, the dispersed particles may retain the dispersion state comparatively similar to that in the case of the static condition and this structure may be destroyed under shearing stress. This difference may be caused by the difference in the thickness and character of the hydration layer of the particles. These results may be well explained by assuming that the thickness and the character of hydration layer depend on the kind of the hydrophilic group of the emulsifying agent.

著者

石栗 太 川島 麻里 飯塚 和也 横田 信三 吉澤 伸夫

出版者

社団法人日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.55, no.6, pp.576-582, 2006-06-15

被引用文献数

2 14

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In the present study, to clarify the relationship between stress-wave velocity of standing trees and their wood quality, stress-wave velocity of 122 standing trees in 27-year-old Hinoki (Chamaecyparis obtusa Endle.) plantation were measured by using a commercial hand held stress-wave timer (FAKOPP). Ten trees were cut down for examining the anatomical properties, static bending properties of small-clear specimen, and quality of square timber (1700 by 55 by 55mm). Stress-wave velocity of standing trees appeared to be affected by wood quality, especially by basic density and Young's modulus in juvenile wood. Significant relationships between stress-wave velocity of standing trees and dynamic Young's modulus or modulus of elasticity in static bending of square timber were found. However, it was very difficult to evaluate the modulus of rupture in static bending of square timber by stress-wave velocity of standing trees, because square timber had some defects such as knots. These results suggested that modulus of elasticity in static bending of square timber can be predicted by the stress-wave velocity.