著者

上田 太郎 朝倉 健二

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.9, no.78, pp.192-199, 1960

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This investigation was planned for researching the effect of the repeated stress upon the longitudinal residual stress existing in the cold drawn carbon steel wire. For the specimen, 0.65% carbon steel wires drawn with 60% and 80% reductions were used, and the diameter of these wires was 1.3mm.<BR>For the measurement of the longitudinal residual stresses existing in these fine steel wires, the present writers adopted the mechanical method and electro-magnetic method.<BR>Hunter fatigue testing machine was used in this investigation, and from S-N curves of these wires the fatigue limit stress and three stresses over the fatigue limit were chosen as the repeated stress to research the behavior of residual stress. The fatigue test specimens were taken out from the fatigue testing machine at 10<SUP>7</SUP> and 10<SUP>6</SUP> cycles for the fatigue limit stress and at the number of cycle just before the break down cycle for each stress over the fatigue limit, and then the specimens for measurement of residual stress were cut out from the middle part of these fatigue test specimens. The distributions of longitudinal residual stresses of these specimens subjected to the repeated stresses were measured and those were compared with that of the standard specimen not subjected to the repeated stress.<BR>From the results obtained by this investigation, it was made clear that if the longitudinal tensile residual stress existing in the outer part of the wire was about 20-30kg/mm<SUP>2</SUP>, the distribution of longitudinal residual stress of the cold drawn steel wire was little affected by the repeated stress under rotating bending over the fatigue limit, and that which is equal to the fatigue limit, either.

著者

日下 一也

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.63, no.5, pp.S9, 2014-05-15 (Released:2014-05-20)

著者

渡辺 孝章

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.11, no.105, pp.352-357, 1962-06-15 (Released:2009-05-26)

参考文献数

21

被引用文献数

1 1

著者

田中 聡一 三木 恒久 関 雅子 重松 一典 金山 公三

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.5, pp.369-374, 2015-05-15 (Released:2015-05-20)

参考文献数

6

被引用文献数

6 6

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To control the amount of solute in cell walls of solution impregnated wood using the conditioning process, the mechanisms of solute diffusion into the cell walls and of solvent evaporation from wood under the process were verified. The effect of relative humidity (RH) on temporal variability of swelling, shrinkage, and mass of wood impregnated with an aqueous solution of polyethylene glycol (PEG1540) was examined. The impregnated wood specimen swelled under the conditioning at the RH over 75%. The specimen was indicated to swell when the amount of the PEG polymers in the cell walls increase in this RH range. On the basis of this indication, the temporal variability of increasing rate of the polymers in the cell walls and of evaporating rate of water from the specimen under the conditioning was well explained by the mechanisms of the solute diffusion and the solvent evaporation, respectively. In the RH range, the increasing amount of the polymers in the cell walls increased with the evaporating amount of the water, which increased with the decrease in the RH. These results were supported by the mechanisms of the solute diffusion and the solvent evaporation, respectively. The diffusion mechanism also supported the effect of the history of the RH on the polymer amount in the cell walls throughout the conditioning and subsequent drying in a vacuum. It was concluded from these findings that the solute diffusion into cell walls is able to be controlled by the surrounding vapor pressure of solvent when the polymers (PEG1540) and water are employed as the solute and solvent, respectively.

著者

吉原 浩 川村 拓司

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.56, no.4, pp.311-315, 2007 (Released:2007-04-20)

参考文献数

27

被引用文献数

6 7

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In this work, we examined the validity of four methods for measuring the mode I fracture toughness of wood; double cantilever beam (DCB), compact tension (CT), single edge notched tension (SENT), and single edge notched bending (SENB) tests, which have been frequently conducted. In the fracture tests, the crack length was variously changed, and the validity of each method was evaluated by the dependence of fracture toughness on the crack length. From the comparisons of fracture toughnesses obtained by the different four methods, the DCB test was more recommended than any other methods because the fracture toughness could be appropriately obtained in the wide range of crack length.

著者

川久保 昌平 平島 健一

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.46, no.9, pp.1011-1016, 1997-09-15 (Released:2009-06-03)

参考文献数

7

被引用文献数

3 3

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Elliptical ring subjected to arbitrary load has not been studied until now, although the solution for circular ring is easy to obtain. The analysis of elliptical ring enclosed by conforcal two elliptical boundaries is much complicated. In this paper, the general solutions of isotropic elliptical ring for stresses and displacements are obtained by the method of Laurent series expansion of complex stress functions and some numerical examples are shown. The accuracy and the rate of convergence of the present method are then discussed based on these solutions.

著者

荒木 健一 小澤 正邦

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.69, no.7, pp.532-537, 2020-07-15 (Released:2020-07-20)

参考文献数

36

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Effect of La2O3-Y2O3 additives on coating and thermal stability of alumina layer on FeCrAl-alloy substrate was investigated. The stable alumina catalytic coat layer is required and its processing parameters are important in practical technology to fabricate automotive honeycomb-type catalytic converters. The two-step modification in La2O3-Y2O3-modified Al2O3 induced better slurry regarding with surface charge as colloid dispersion and rheological properties with lower viscosity and low stress under moderate shear rate condition. Surface Y2O3 controls zeta potential to high pH region so that alkaline solution can be applied to metal and alloy substrates. The newly modified Al2O3 coat layer can react with alumina interlayer grown on FeCrAl alloy surface. In conclusion, the optimal coating stability was attained with present La2O3-Y2O3 co-doped Al2O3.

著者

小原 二郎

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.10, no.98, pp.894-899, 1961-11-15 (Released:2009-05-26)

被引用文献数

2 2

著者

山田 文二郎

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.16, no.169, pp.800-808, 1967-10-15 (Released:2009-06-03)

参考文献数

31

著者

安藤 桃子 杉村 和紀 上高原 浩

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.70, no.7, pp.547-553, 2021-07-15 (Released:2021-07-20)

参考文献数

30

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Liquid crystallinity of (hydroxypropyl)cellulose (HPC) derivative in aqueous solution was examined to develop eco-friendly liquid-crystalline system. Bulky adamantoyl group (adamantyl ester) was introduced as a substituent on HPC, and the effects of the degree of adamantoyl substitution (DSAd), polymer concentration, and temperature on the chiroptical properties, especially coloration and turbidity, of the aqueous lyotropics were investigated by circular dichroism, CD, and ultraviolet–visible–near-infrared, UV–Vis–NIR, spectrophotometry. Adamantates of HPC (Ad- HPCs) with extremely low DSAd (< 0.1) were successfully synthesized by acylation of HPC with 1-adamantanecarbonyl chloride in tetrahydrofuran. Ad-HPCs of DSAd ≤ 0.08 were highly soluble in water, and the concentrated aqueous solutions formed a right-handed cholesteric liquid-crystalline phase to impart vivid reflective colorations. The cholesteric helical pitch P, comparable to the wavelength of maximal reflectance λmax, increased with increasing DSAd of Ad-HPC and with decreasing polymer concentration. Wide-angle X-ray diffractometry, WAXD, revealed that the increases of P were attributable to the decrease of the twist angle ϕ between adjacent thin nematic layers. The aqueous Ad-HPC lyotropics were phase-separated and became turbid at an elevated temperature of > ∼30°C. Such a lower critical solution temperature (LCST)-type phase separation behavior of the Ad-HPC/water system was also affected by the hydrophobic adamantoyl group; the observed cloud point Tc was shifted to lower temperature side with increase in DSAd, presumably due to the heightening of hydrophobic interactions between the solute Ad-HPCs in water.

著者

山田 直樹

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.10, pp.943-949, 2018-10-15 (Released:2018-10-20)

参考文献数

19

被引用文献数

2

著者

鎌田 浩毅

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.5, pp.444-451, 2003-05-15 (Released:2009-06-03)

参考文献数

41

被引用文献数

1 1

著者

井上 真澄 Khamhou Saphouvong 児島 孝之

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.56, no.12, pp.1183-1188, 2007

被引用文献数

1

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Recently, the concern with acrylic resin as a new repair material has been growing. The acrylic resin is characterized by high quality, low viscosity, highly elongation percentage and so on. Several studies have been made on the crack repair by using acrylic resin, but little is known about the effect of acrylic resin as a crack repair material for concrete.<br>The purpose of this study is to examine the applicability of acrylic resin for using as a crack repair material for the concrete structures. The fundamental mechanical properties of acrylic resin by using super lightweight powder were examined. And the repair effects of acrylic resin as crack repair material were examined by the flexural loading test of the concrete member repaired by crack injection technique. As a result, acrylic resin could adjust the viscosity by using super lightweight powder, and the elongation percentage of acrylic resin was superior to epoxy resin. The crack repair effects of acrylic resin were equivalent to the epoxy resin under drying condition of the crack surface of concrete member.

著者

菊池 将一

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.64, no.6, pp.501-502, 2015

著者

米澤 政昭 奥田 昇也 朴 永太

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.47, no.12, pp.1204-1209, 1998-12-15 (Released:2009-06-03)

参考文献数

12

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This paper describes a new numerical integration method for evaluating structural failure probability. The proposed method utilizes the centerline directional vectors, which are related to the specified numbers of finite element meshes divided on the surface of the unit hypersphere. The failure probability is evaluated numerically by using the values of hyperareas of the finite element meshes and conditional failure probabilities on the centerline directions of the meshes. To save computational efforts, the calculation of the conditional failure probabilities is restricted in the effective directional regions, where all the distances from the origin to limit state surfaces are short enough and within the limit of the effective distance range. The effective distance range is determined in the preliminary search procedure to get the information about the limit state surfaces situation.Numerical examples are presented to illustrate the validity of the proposed method to evaluate the structural failure probabilities.

著者

河村 進 大畑 敬 村田 功二

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.58, no.4, pp.280-285, 2009

被引用文献数

1 1

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It is known that the shear performance of plywood depends on the grain direction of veneer sheets, and if veneer sheets are oriented 45 degree against the lateral sides, it indicates highest shear performance. Authors produced experimentally the diagonal plywood, which were laminated parallelogram veneers oriented diagonally against the lateral sides. The in-plane shear performance of the bearing wall, which joined diagonal plywood to the frame with the nail spaced 50mm to 150mm apart, was evaluated by racking test. When the nail space was shortened, load at yield point increased, but maximum load of diagonal plywood was almost equal to standard plywood. The comparable result was also obtained from the lateral nail resistance test.<br>In conjunction with this, shear strain distribution of panel was measured by digital image correlation (DIC), and approximate shear modulus of panel could be calculated from load-strain curve. Shear strain of diagonal plywood was lower than that of standard plywood. The bearing wall using diagonal plywood indicated large initial stiffness. As a result, it was concluded that bearing wall using diagonal plywood indicates higher reference shear strength. In order to increase the shear strength that is added to diagonal plywood, it is effective if the interval of nail is to some extent shorter than 150mm, which is the specification of wall index 2.5 of bearing wall using standard plywood. Shear modulus of full-sized diagonal plywood was about 4 times as much as that of standard plywood.

著者

張 学超 森 敬祐 真壁 朝敏 井上 晋一 安藤 新二

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.70, no.6, pp.473-478, 2021

被引用文献数

1

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<p>Push-pull fatigue tests of rolled magnesium alloys AZ31 and AZX912 were performed with a side-notch plate specimen to examine the effect of a single overload on the crack growth behavior under a stress ratio of -1. The behavior in retardation of crack growth was unclear in the case of AZ31 because the crack growth rate was relatively higher at the overload point. However, this was observed clearly, when the branching of the crack tip happened in the case of AZX912. The geometry of the fracture surface and the changes in crack growth path were related to the crack growth behavior. The crack opening level became higher when the crack growth rate was lower. Therefore, the crack closure is related to the retardation of the crack growth rate. When the branching of a crack tip occurred, not only the residual compression stress at crack front but also the variation of local crack growth direction after overload affected the fatigue crack growth behavior. </p>

著者

西野 孝

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.1, pp.97-103, 2008 (Released:2008-01-20)

参考文献数

26

被引用文献数

3 4

著者

矢野 浩之

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.46, no.8, pp.996-1002, 1997-08-15 (Released:2009-06-03)

参考文献数

43

被引用文献数

1

著者

林 高弘

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.69, no.8, pp.593-598, 2020-08-15 (Released:2020-08-20)

参考文献数

13