著者

中西 洋一郎 木本 正樹 淡路 敏夫

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.45, no.10, pp.1125-1130, 1996-10-15 (Released:2009-06-03)

参考文献数

15

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In order to obtain fundamental knowledge on the thermal recycling of FRP, the TG and DTA of FRP under air flow were measured. The influences of types of fiber and matrix resin, resin fraction and additive on the thermal degradation and combustion processes were examined for GFRP and CFRP. The following results were obtained.(1) The decomposition and ignition temperatures of GFRP made from UP resin were lower than those of the FRP made from Ep resin. (2) The ignition temperature of FRP was lower than that of matrix resin. (3) Carbon fiber in a CFRP burned at lower temperature than the non-composite carbon fiber itself. (4) The powder form samples of resin and FRP decomposed and burned at lower temperature than the block form samples. (5) The addition of calcium carbonate did not influence the thermal degradation and combustion processes of GFRP.

著者

西村 六郎 八木 雅之 山川 宏二

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.45, no.11, pp.1186-1191, 1996-11-15 (Released:2009-06-03)

参考文献数

7

被引用文献数

1

---

The effects of carbon dioxide on corrosion rate, polarization curve and hydrogen content have been investigated for carbon steels in acetate solutions and sodium carbonate solution with a pH range of 2 to 9 at 313K under carbon dioxide and nitrogen atmospheres. In the acidic solutions less than pH4 both general corrosion and hydrogen content are accerated by the existence of carbon dioxide. In the solutions more than pH7 little corrosion is observed with or without carbon dioxide, where as hydrogen content is detected only at the existence of carbon dioxide. The anodic and cathodic polarization curves with or without carbon dioxide show that their reaction overpotentials are affected by carbon dioxide, effect of which changes depending upon pH. The results obtained are qualitatively explained in terms of the formation of iron carbonate, the adsorption of carbonate ions and so on.

著者

浅見 克敏 橘内 良雄

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.35, no.392, pp.550-556, 1986-05-15 (Released:2009-06-03)

参考文献数

55

被引用文献数

2

著者

八代 浩二 栗村 隆之

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.67, no.4, pp.493, 2018-04-15 (Released:2018-04-20)

著者

安川 昇一 大谷 眞一 熊谷 正芳 菊地 拓哉

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.67, no.3, pp.375-382, 2018-03-15 (Released:2018-03-20)

参考文献数

10

被引用文献数

1

---

Shot peening, which imparts compressive residual stress, is a very effective means for improving the fatigue strength and is widely used for manufacturing process such as automobile industry and aircraft industry. In this study, with the aim of clarifying experimentally the microscopic residual stress distribution of a single dent by projecting a fine ceramic ball with a diameter of 3 mm onto an aluminum alloy material, and the existence of shear stress is clarified by triaxial stress analysis. Furthermore, the change of the residual stress distribution when multiple shots are given to the same position of single dent is also clarified. Obtained results are summarized as follows: (1) The central portion of the dent has a tensile residual stress in both radial and circumferential directions of the dent. A residual stress in the radial direction of the dent has a peak of compressive residual stress outside the dent mark, and a compressive residual stress is given up to an area up to about four times the dent diameter. On the other hand, a tensile residual stress is generated in the circumferential direction of the dent to the region of four times the dent diameter, and the peaks of the tensile residual stress are present on the central part of the dent and outer of the dent. (2) The macroscopic residual stress in the radial direction gradually changes to compressive stress in accordance with the number of shot projections, but does not change substantially in the circumferential direction. (3) As a result of triaxial stress analysis on a single dent, shear stress components σ12 and σ23 does not exist, but it became clear that shear stress σ13 is generated at the dent boundary.

著者

加藤 真示 平野 裕司 岩田 美佐男 佐野 泰三 竹内 浩士

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.52, no.6, pp.560-565, 2003-06-15 (Released:2009-06-03)

参考文献数

22

被引用文献数

2 2

---

TiO2 photocatalytic filters are utilized for various fields of environmental purification, such as decomposition of stench substances and harmful chemicals, etc. However, it turned out that the decomposition rate of sulfide chemicals, such as hydrogen sulfide (H2S) and methylmercaptan (CH3SH), were very slow to react on TiO2 under UV irradiation. In order to improve the decomposition ability of sulfide chemicals, this Ag-deposited Photocatalytic filter has been developed. The Ag-deposited photocatalytic filter was fabricated by coating TiO2 on the porous ceramics body, and successively depositing nano-sized Ag particles on TiO2 by means of photodeposition method. It was observed that Ag deposition on TiO2 improved the adsorption ability for H2S gas and CH3SH gas. Consequently, the Ag-deposited photocatalytic filter could remove H2S gas and CH3SH gas with an 8.0 times, and an 8.7 times effectiveness, respectively, in comparison with conventional TiO2 photocatalytic filter.

著者

高谷 克彦

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.54, no.3, pp.346-351, 2005 (Released:2006-04-07)

参考文献数

51

被引用文献数

2 2

著者

板東 舜一

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.59, no.8, pp.653-657, 2010-08-15 (Released:2010-08-20)

参考文献数

2

著者

林 知行

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.53, no.3, pp.345-350, 2004-03-15 (Released:2009-06-03)

参考文献数

19

著者

林 眞琴

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.46, no.4, pp.432-437, 1997-04-15 (Released:2009-06-03)

参考文献数

7

被引用文献数

4 4

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The effect of fluctuating stress on the fatigue strength of type 304 stainless steel in air at 288°C was examined. In any of the 2 step increasing stress, 2 step decreasing stress, repeated 2 step stress (high to low), repeated 2 step stress (low to high) and gradual increasing stress, the cumulative usage factor calculated based on the linear damage law exceeds 1. In the 2 step increasing or decreasing stress, the usage factor for the decreasing stress type is larger than the increasing stress type. On the other hand, the cummulative usage factor for the repeated 2 step stress (low to high) is larger than the repeated 2 step stress (high to law), and the usage factor increases with increasing number of cycles at the first stress. The smaller the difference between the first stress and the second stress, the larger the usage factor. In the gradual increasing stress, the usage factor increases with increasing number of cycles at each stress.

著者

片柳 賢一 大西 哲也

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.51, no.1, pp.118-122, 2002-01-15 (Released:2009-06-03)

参考文献数

9

著者

山下 亮 廣井 幸夫 荒添 正棋 山本 貴士 宮川 豊章

出版者

公益社団法人 日本材料学会

雑誌

材料

巻号頁・発行日

vol.66, no.8, pp.559-565, 2017

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<p>Creep behavior of the epoxy resin anchor for CFRP sheet embedded in concrete was studied. Creep tests in 20°C and 40°C with the sustained loads of 3.0kN and 4.5kN were conducted for 42 days (1000 hours), where 3.0kN corresponded to the design load for the anchor. As a result, it was found that the creep displacement in the 40°C test was very large at the beginning of loading compared to the 20°C test. The glass transition temperature, Tg, was assumed to be the reason for the large creep displacement in the 40°C test. Therefore, Tg, tensile strength, and tensile modulus of elasticity were measured with various curing conditions for the epoxy resin. The measured Tg was 41°C with 23°C-7days curing and it increased up to 57°C for 7 days in case the curing temperature was increased from 23°C to 40°C. In addition, it was found that the tensile strength and the tensile modulus of elasticity showed linear relationship with Tg in the range of 41°C to 57°C, and the tensile modulus of elasticity in 40°C was 40% of that in 20°C when Tg was 45°C. The curing condition for 45°C of Tg was equivalent to the beginning of the 40°C creep test. Thus, it was concluded that the reason for the large displacement in the 40°C creep test was because Tg was relatively close to the test temperature.</p>

著者

都築 一雄 山田 直人 野村 健

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.32, no.359, pp.864-868, 1983-08-15 (Released:2009-06-03)

参考文献数

3

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In this study, six species of wood and four wood based materials were tested in bending from -180 to +20°C, and the influence of temperature on bending strength (Fb) and Young's modules (Eb) was discussed. In the case of wood, not only the effect of temperature but also that of specific gravity on Fb and Eb were discussed. The moisture content of specimens was controlled to about 4% at 20°C in a vacuum, and the temperature during bending tests was regulated with liquid nitrogen and nitrogen gas.The results obtained are as follows.(1) In the case of wood, Eb and Fb are representable by the equations (3) and (4) respectively, containing two factors, specific gravity (ρ) and test temperature (θ°C).(2) The effect of temperature on Eb for wood based materials tested is illustrated on Figures 1 to 6. As the results, Eb increases as temperature falls, and their relation can be expressed approximately by a regression straight line for each wood based material.(3) Figure 7 shows the relation between Fb for wood based materials and test temperature.

著者

袖山 研一 友寄 篤 野口 貴文 東 和朗

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.66, no.8, pp.574-581, 2017-08-15 (Released:2017-08-20)

参考文献数

15

被引用文献数

6

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“Shirasu” is a whitish sand found in pyroclastic flow deposits that includes a crystal mineral and an amorphous silicate. It has the properties of both a fine aggregate and a mineral admixture owing to its pozzolanic reaction. To utilize Shirasu as industrial resource, separation of the amorphous silicate and the crystal mineral is required. It is shown in this study that dry gravity classification is effective for dividing Shirasu into the crystal mineral and pumice, and can be used to obtain the amorphous silicate. This paper reports fundamental experiments on a high-strength concrete with a pulverized fine Shirasu powder used as a mineral admixture. In particular, fine Shirasu powder comprising the amorphous silicate pulverized to a particle size of 1μm exhibited high performance as mineral admixture equivalent to that of silica fume.

著者

綾野 克紀 藤井 隆史

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.66, no.8, pp.588-593, 2017-08-15 (Released:2017-08-20)

参考文献数

6

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Many concrete deck slabs of bridges have been deteriorated by heavy traffic, and freezing and thawing action. The water through the broken waterproof layer promotes the deterioration of concrete much more. Concrete used in replacements should have high resistance against freezing and thawing attack and fatigue in water. In this study, it is shown that the resistance to freeze and thaw attack can be improved by granulated blast furnace slag sand even without AE agent. The resistance to freeze and thaw attack of non-AE concrete with granulated blast furnace slag is almost same as that of AE concrete with the ordinary crushed sand. The fatigue of concrete suffered from freeze and thaw attack depends on the type of binder. When the crushed sand is used, the fatigue of concrete with high early strength Portland cement suffered from freeze and thaw attack is lower than that with ordinary Portland cement. When blast furnace slag sand is used, the tendency is almost same as when crushed sand is used. However, when blast furnace slag sand is used, the fatigue of concrete suffered from freeze and thaw attack can be improved with water curing period. It is also shown in this paper that blast furnace slag sand reacts with water and improve the durability of concrete.

著者

島村 真介 須賀 一博 江澤 良孝 青木 繁

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.57, no.10, pp.1043-1048, 2008-10-15 (Released:2008-10-18)

参考文献数

6

被引用文献数

1 1

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The impact characteristics of a cue in billiards are investigated for the case where a ball is hit on the right or the left part to give a spin. The efficient computational method developed in the previous paper is extended for this investigation. The extended method is verified with an experiment using a high speed camera, i,e., the ball trajectory calculated with the extended method is shown to agree well with that measured using a high speed camera. It is shown from a numerical simulation that the impact force, the ball velocity, the spinning velocity and the deviation of the ball trajectory from the hitting direction increase with increase in the Young's modulus and density of a shaft. Because the proposed analytical method can predict quantitatively these impact characteristics of a cue, it is useful for designing an easy-to-use cue.

著者

金澤 健二 山口 弘二 佐藤 守夫 鈴木 直之 金尾 正雄

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.30, no.332, pp.454-460, 1981-05-15 (Released:2009-06-03)

参考文献数

16

被引用文献数

1 1

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In order to obtain basic data for high-temperature, high-cycle fatigue properties of S45C(0.45C) and SCM435 (0.35C, 1Cr, 0.15Mo) steels, rotating bending fatigue tests were carried out up to 108 cycles on smooth and two kinds of notch specimens at room temperature, 200, 300, and 500°C with a frequency of 125Hz.The fatigue strength at 108 cycles and the S-N curves up to 108 cycles were found to change depending upon test temperature and stress concentration factor. The temperature and material dependences of fatigue strength of the smooth specimen were explained qualitatively by the blue brittleness phenomenon of the materials used.Cracks were observed on the cross section of specimens endured 108 cycles sometimes depending on the test condition. The temperature dependence of the change in fatigue strength due to the variation of stress concentration factor corresponded to the existence of such cracks. The notch root curvature for branch point at 400∼500°C was larger than that at room temperature to 300°C. It is considered that oxidation film formed at the surface of crack plays an important role in delaying for crack to propagate.

著者

森田 辰郎

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.64, no.7, pp.S4, 2015-07-15 (Released:2015-07-20)

著者

関口 久美 西村 正己 土師 正一

出版者

公益社団法人 日本材料学会

雑誌

材料試験 (ISSN:03727971)

巻号頁・発行日

vol.5, no.30, pp.172-179, 1956-03-15 (Released:2009-05-26)

参考文献数

7

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Hevea stocks have been used to produce vibration isolators but recently they are using many synthetic rubbers. Each of them has its own merits and demerits, so by vibration tests we intended to explain and compare their characteristics employing hevea stock F.A.Q. No. 3, neoprene G.N.-A., hycar-OR-25 and silicone, so that we may obtain data to decide what sort of rubber should be used to design isolators.The followings were examined: (a) influence of temperature, (b) amplitude dependency, (c) oil resistancy, (d) after effect, and (e) others.

著者

玉野 富雄 西田 一彦 Bimal SHRESTHA 金岡 正信 森本 浩行

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.53, no.1, pp.5-8, 2004-01-15 (Released:2009-06-03)

参考文献数

2

被引用文献数

2 2

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Japanese Castle masonry walls constructed from the end of sixteen century to the middle of seventeen century hold a historical heritage in the construction culture and are famous worldwide for their uniqueness with mortar-less construction. Present investigations on these walls have shown bulging at various locations and the engineering evaluation on the wall stability needs to be urgently required. Based on this viewpoint, this paper presents the FEM analysis results on the stability and deformation behavior with parametric analyses on Osaka Castle masonry wall. It is found that the cobble plays a significant role in reducing the stresses of stone wall and that the masonry wall structure ratio adds stability by the arching effect action on the masonry wall.