著者

三木 五三郎

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.19, no.205, pp.900-904, 1970-10-15 (Released:2009-07-09)

---

Special attention must be paid to the fill construction where coal ashes are used because they have particular geotechnical properties.Coal ashes are sandy coarse silt and have no plasticity. They have such small specific gravity as 2.1. Compacted coal ashes have strong shearing resistance at the optimum moisture content, but loose coal ashes have the risk of liquefaction when they are saturated.In Hisasue valley in Kawasaki city, an extensive flow slide of fill construction where coal ashes were used occurred in June, 1965. The fill consisted of loose dumping ashes and it collapsed just when it had been saturated by the seeping groundwater to the critical state.In Hodogaya in Yokohama city, a large fill construction has been built with coal ashes with special attention paid to the drainage of groundwater and to the compaction of fill material. The work has proved a success.

著者

竹田 憲生 成瀬 友博 河野 賢哉 服部 敏雄

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.52, no.2, pp.204-209, 2003-02-15 (Released:2009-06-03)

参考文献数

9

被引用文献数

4 4 2

---

Silicone gel is usually applied to electrical automotive devices to protect them from corrosion. However, under a vibration environment, the silicone gel vibrates bonding wires in the devices, thus, to evaluate the reliability of the devices, the vibration analysis of the gel/wire structure is indispensable. In this study, we clarify the relation between the fatigue life of gel-protected bonding wires and the geometry of the gel and bonding wires experimentally. It was founded that the diameter of wires and the thickness of the gel have a significant influence on fatigue life. Then, we developed a method, based on a vibration analysis model that takes into account the visco-elasticity of a gel, for predicting the fatigue life of the wires. It was confirmed that the predicted fatigue life showed good agreement with the measured fatigue life. Finally, we developed a design tool for easily calculating the fatigue life of the wires. This tool estimates the strain range by using a response surface, i. e., a neural network. As Bayesian regularization was executed in learning of unknown parameters in the neural network, we could make the response surface and ensure good generalization ability.

著者

中戸 莞二

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.20, no.219, pp.1354-1360, 1971-12-15 (Released:2009-06-03)

参考文献数

25

著者

山本 三三三

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.21, no.224, pp.355-359, 1972-05-15 (Released:2009-06-03)

参考文献数

23

被引用文献数

8 7

---

Hereunder is discussed the applicability of constitutive equations of integral type to some nonlinear non-steady viscoelastic behaviors of concentrated polymer systems. Two types of models based on Lodge's model are considered. One of them is to represent the generalization of the so-called WJFLMB model and has the after-effect function depending on the invariants of the rate-of-deformation tensor at the time of excitation. The other is the generalized WKZ model with the after-effect function depending on the invariants of the relative deformation tensor between the times of excitation and response. Both the models can well explain the rate-of-defomation dependences of the viscosity coefficient and of the normal stress differences for a steady simple shearing flow. The model depending on the rate-of-deformation is simpler and rather good than the relative deformation dependent model in the explanation of some nonlinear non-steady viscoelastic behaviors such as the stress development at the biginning of flow, the stress relaxation after stoppage of the flow, and parallel and orthogonal superpositions of small sinusoidal oscillation on the steady shearing flow. The former model is, however, not efficient enough to give cause to deformation dependence of the relaxation modulus in the stress relaxation in the usual sense for large shearing deformation.

著者

黒田 雅利 島崎 智憲 岩本 達也 秋田 貢一 小林 祐次 水野 悠太

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.72, no.3, pp.154-160, 2023-03-15 (Released:2023-03-20)

参考文献数

13

---

In order to develop the technique to predict the surface characteristics of fatigue specimens of austenitic stainless steels by controlling finishing processing of lathe turning and shot peening, the applicability of the response surface models formerly created by the present authors using experimental design of experiments approaches to the fatigue specimens with different types and/or rolling conditions of austenitic stainless steels have been investigated. The conclusive remarks could be summarized as follows: (1) The predicted surface residual stress obtained by the response surface model of the lathe turning created for the round bars of SUS304 agreed with the observed surface residual stress of the fatigue specimen of SUS316. (2) The response surface model of the shot peening created for the flat plate of SUS316 was applicable to the prediction of the surface roughness RSm, the surface hardness and the surface residual stress of the fatigue specimen of SUS316 in spite of the different processing of the shot peening and the rolling conditions of the material.

著者

加藤 博之 秋津 裕志

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.71, no.4, pp.402-407, 2022-04-15 (Released:2022-04-20)

参考文献数

13

---

Dakekanba is the most popular broad leaf tree in Hokkaido. This study proposed the wood for manufacturing baseball bat. In order to compare the dakekanba wood with the others manufactured historically; sugar maple, aodamo, yellow birch, and white ash, full baseball bats with the same dimension were prepared from these woods. The performance of bat was studied by the impact test with fast pitched ball. The flexural vibration was measured by means of strain gauge. Results of the modal analysis showed that the first natural frequency was around 35 Hz and the second, 233 Hz, which were almost equal among these woods. The amplitudes of these modes increased with increasing the speed of pitched ball. As a result, the maple bat was the hardest in deflection and slowest in damping, and aodamo was the softest in deflection and the fastest in damping. It was concluded that these properties of dakekanba bat were close to those of yellow birch and white ash, which have served as intermediate between maple and aodamo.

著者

冨田 恵之

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.39, no.441, pp.648-654, 1990-06-15 (Released:2009-06-03)

参考文献数

38

被引用文献数

2

著者

小林 英男

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.27, no.297, pp.495-505, 1978-06-15 (Released:2009-06-03)

参考文献数

20

被引用文献数

1

著者

北川 正義 新濃 隆志 若生 豊

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.49, no.9, pp.970-975, 2000-09-15 (Released:2009-06-03)

参考文献数

9

---

As one of serial studies on the mechanical properties of spider threads, the effect of viscid droplet on their deformation behavior was investigated. The viscid droplets are regularly spaced on the spiral thread building orb web for capturing insects. It was shown that 1) the most abundant amino acid of the droplet is prolyne, while the component of the capture thread is not so different from that of dragline, 2) its surface tension is about 65mN/m which is comparable to that of water, and 3) although the capture thread deforms like rubber due to the existence of the viscid droplet, it behaves like dragline if the droplets are removed from it.

著者

野谷 秀雄 本田 浩二

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.1176-1180, 1996-11-15 (Released:2009-06-03)

参考文献数

6

---

Stains on the shell of non-coating rolling stock tend to be conspicuous when compared with rolling stock coated with paint. In some cases these stains sticking to metallic surface remain unremoved in a simple water washing process. In this investigation, an attempt was made to clarify the mechanism of stains. At first, the contents of stains on the non-coating rolling stock shell was examined and it was found that stains principally consisted of iron rust and iron compounds supposed to be the wearing powder of wheel and rail. From this finding, the method of accelerated staining with iron filings was developed. The stains of shell were reproduced on dry and wet cyclic environment tests after iron filings on the test specimen. For cleaning of these stains, normal and high viscosity cleansers were compared. The high viscosity one showed a good result for removing stains.

著者

藤井 朋之 東郷 敬一郎 山本 崇博 鈴木 幸則 島村 佳伸 尾嶋 良文

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.62, no.12, pp.770-777, 2013-12-15 (Released:2013-12-20)

参考文献数

11

被引用文献数

4 5

---

In this paper, fatigue tests and finite element analysis are carried out on spot weld-bonded joints of mild steel (270MPa class) and ultra-high strength steel (980MPa class) in order to investigate influence of strength level of base steels on fatigue strength and fatigue fracture behavior of spot weld-bonded joints. From the fatigue tests and finite element analysis, the following results are obtained : (1) The fatigue strength of the spot weld-bonded specimen is higher than that of the spot welded specimen. (2) The fatigue limit of the spot weld-bonded specimens of the ultra-high strength steel is higher than that of the mild steel. (3) The interfacial debonding propagates from the adhesive edge to a nugget edge, and the fatigue crack initiates at the nugget edge in both steels. (4) The fatigue strength of spot weld-bonded specimens is improved because the stress concentration at the nugget edge is reduced by adhesive bonding during large part of fatigue life.

著者

江島 晋

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.60, no.6, pp.560-566, 2011-06-15 (Released:2011-06-21)

参考文献数

23

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.69, no.9, pp.698, 2020-09-15 (Released:2020-09-20)

著者

島地 謙

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.28, no.310, pp.671-677, 1979-07-15 (Released:2009-06-03)

参考文献数

12

著者

石原 茂久

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.48, no.5, pp.473-482, 1999-05-15 (Released:2009-06-03)

参考文献数

103

被引用文献数

16 16

著者

小倉 敬二

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.32, no.361, pp.1194-1199, 1983-10-15 (Released:2009-06-03)

参考文献数

8

被引用文献数

1 2

著者

千野 靖正 下島 康嗣 山田 康雄 文 翠娥 馬渕 守

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.50, no.11, pp.1228-1232, 2001-11-15 (Released:2009-06-03)

参考文献数

23

被引用文献数

3 2

---

In the present investigation, open die forging tests have been conducted for AZ31 and ZK60 Mg alloys. Microstructure and mechanical properties of the forged Mg alloys have been investigated. Cylindrical specimens with a diameter of 18mm and a height of 18mm were forged in a temperature range of 323 to 673K. The forged specimens of both Mg alloys had good surface quality at high forging temperatures of more than 573K. Microstructural observation revealed that grains were recrystallized by hot forging, though unrecrystallized grains were partially found. The recrystallized grain area for AZ31 was larger than that for ZK60. The mean size of the recrystallized grains decreased with decreasing forging temperature. In particular, a very small grain size of about 3μm was attained by forging at 473K. As a result of tensile tests, it has been found that ultimate tensile strength and 0.2% proof stress of the forged Mg alloys increased with a decrease in forging temperature. This was related to grain refinement by hot forging.

著者

幡 克美

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.777-783, 1967-10-15 (Released:2009-06-03)

参考文献数

68

著者

三木 光範

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.37, no.414, pp.354-355, 1988-03-15

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.8, pp.828, 2018-08-15 (Released:2018-08-20)

参考文献数

3