著者

熊谷 正芳

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.9, pp.889, 2018-09-15 (Released:2018-09-20)

著者

田崎 陽介 吉田 郁政 秋元 宏仁 末政 直晃

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.2, pp.190-195, 2018-02-15 (Released:2018-02-20)

参考文献数

18

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Maintenance problem for infrastructures such as bridge, road, airport, etc., attracts keen interest in modern Japan. We have to cope with repair and maintenance for infrastructures with limited financial resources. In airport pavements, repair works are restricted by daily flight operation, so that efficient maintenance planning is required. In this paper, we try to model deterioration of an existing airport runway, which is composed of 100 units. PRI (Pavement Rehabilitation Index) for each unit is obtained by 3 to 8 times of inspection during around 28 years. PRI is an index to provide an objective evaluation of pavement surface condition, with criteria determined for judging the need for rehabilitation work on runway, taxiway, and apron pavements. Many researches and practitioners use PRI for airport pavement maintenance in Japan. The spatial distribution of deterioration in airfield pavement is not discussed in many previous studies. This study discusses deterioration curve for each unit and feature of spatial distribution. The distribution of deterioration based on PRI and the probability of exceedance of each PRI criteria in future are estimated by the proposed method.

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

村瀬 勝彦 ジョーンズ ノーマン

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.483, pp.1420-1426, 1993-12-15

被引用文献数

5 6

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Progressive plastic buckling appears in the axial symmetric behavion of circular tubes subjected to static loads or low velocity impacts,when the inertia effect is neglible.For high velocity impacrs in which imertia cannot be neglected,the studies.However,a series of impact tests on tubes by Florence et al.recorded thephenomenon of dynamic plastic buckling in which the deformation consists of many waves superposed on a uniform plastic deformation.This phenomenon was found for moderately thick circular tubes subjected to high velocity axial impacts.Ren et al. observed that dynami plastic buckling developed on thin circular tubed.Thus,the plastic buckling behavior for high velocity impact tests on circular tubes consist of both progressive plastic buckling and dynamic plastic buckling,but the deraied behavior is not clear yet.The purpose of this study is to clarify the characteristics for the transition process from progressive plastic buckling to dynamic plastic buckling.In particular,the following features are examined:(1) The comparison and consideration of various experimental methods used in the pervious impact test results.(2) The influence of end condition on the static buckling behavior of circular tubes.(3)The consideration of some impact test results.

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

林田 建世 福本 博明 山口 明

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.22, no.243, pp.1104-1109, 1973-12-15

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The stationary viscoelastic properties of general purpose polystyrene (GPPS) and high impact polystyrene (HIPS) melts were measured by means of a screwless extruder. Since the cone rim pressure was not equal to the atmospheric pressure, some theoretical considerations were necessary to derive an approximate relation for calculating the first normal stress difference from the profile of Weissenberg's pressure and the value of pressure at the cone rim. Measurements of Weissenberg's pressure were performed in a stationary state which occur-red at 7〜10 min after the starting of the rotor and continued for about 5 min. The first normal stress difference observed for low density polyethylene (M.I.=2.0, 190℃) showed a fairly good agreement with the literature values. The first normal stress difference for GPPS was slightly greater than that for HIPS at the same shear rate. Some flow properties were measured with an extruder-type rheometer according to both Bagley's and the pressure gradient methods, which gave the same results. The apparent viscosity of HIPS was somewhat greater than that of GPPS at the same shear rate. The rigidity, calculated from the first normal stress difference and the apparent viscosity for HIPS, was considerably higher than that for GPPS at the same shear rate. The correlation between the Weissenberg effect data and the exit pressure data was also examined.

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

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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

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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

鄭 強 荒木 修 瀧川 敏算 高橋 雅興 升田 利史郎

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.45, no.12, pp.1284-1289, 1996-12-15

参考文献数

23

被引用文献数

2

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Mixtures of Poly (metyl methacrylate) (PMMA) and poly (α-methylstyrene-co-acrilonitrile) (αMSAN) exhibit a LCST type of phase behavior. Dynamic rheological properties of PMMA / αMSAN blends of various compositions were measured at temperatures below, near, and above the phase-separation temperature. The time-temperature superposition was tried to obtain the master curves of G′ and G″ at 160℃. The time-temperature superposition principle failed above a certain temperature due to a phase separation. The "breakdown" temperature is close to the cloud temperature T_c of the blend samples. Comparison of log G′ vs. log G″ relation between the two components and the blends was made. The results show that the slopes of log G′ vs. log G″ plots in the terminal region are dependent on the composition of the blends. The rheological measurements have been found to be useful for characterizing the phase-separation of PMMA / αMSAN blends.

著者

矢野 武夫

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.28, no.312, 1979-09-15

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

東 泰助 井上 誠 小野木 伯薫 横田 勝 村田 安規 中平 敦

出版者

The Society of Materials Science, Japan

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.59, no.6, pp.418-422, 2010

被引用文献数

3 1

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The development of low melting temperature coating materials for brazing diamonds was attempted for diamonds wire saw for slicing single crystal silicon.The diamonds wire saw was made by brazing diamonds on SUS-304 wire with high strength for the sawing equipments. Since the degradation of SUS-304 wire was generally generated at higher temperature over 600°C, the high performance coating materials, composed of 47.5 wt.%Ag-25.5 wt.%Cu-27.0 wt.%Sn based materials, was developed by addition of Ni into them to improve the brittleness for SUS-304 wire. These results suggested that the coating material of (47.5 wt.%Ag-25.5 wt.%Cu-27.0 wt.%Sn)-1 wt.%Ni was the suitable brazing of the diamonds SUS-304 wire for sawing equipments.

著者

長嶋 晋一

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.32, no.358, pp.705-715, 1983-07-15

被引用文献数

2 1

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>