著者

新保 正樹

出版者

The Japanese Society of Snow and Ice

雑誌

雪氷 (ISSN:03731006)

巻号頁・発行日

vol.22, no.2, pp.48-54, 1960 (Released:2009-09-04)

参考文献数

5

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In the case of friction of paraffin and skiing waxes (climbing wax and downhill wax), whose thicknesses were kept constant, μS was found to depend the penetration, whereas μK remained constant in general. (Fig. 1., 2, 3) When the penetration was kept constant and the thickness was varied, μS increased with increasing thickness while μK remained constant. When, kowever, the penetration was made larger or the air temperature was made lower, μK proved to increase slightly with thickness. (Fig. 5, 6, 7, 8, 9, 10) From early days, the behavior of these skiing waxes has been considered to be mysterious, but the above-mentioned data show that climbing ability coincides with the value of μS which varies with their penetration, film thickness or other factos, and that sliding ability depends upon μK on snow.Thus we can obtain a wax with large μS by adjustment of these factors maintaining the value of μK constant. The ability of these paraffin and skiing waxes can be explained from their frictionthickness diagram. (Fig. 7, 8, 11, 13, 12, 14)

著者

新保 正樹

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.7, no.60, pp.474-480, 1958-09-15 (Released:2009-05-26)

参考文献数

11

著者

新保 正樹

出版者

The Japanese Society of Snow and Ice

雑誌

雪氷 (ISSN:03731006)

巻号頁・発行日

vol.22, no.5, pp.147-156, 1960 (Released:2009-09-04)

参考文献数

12

被引用文献数

1 1

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In the preceding paper, the author reported the outdoor observation results on the surface friction of snow. This time, it is recognized from the laboratory experiments that the changes of water content and rheological properties of snow according to air temperature are the dominant factors to control the values of friction coefficient, μs and μk, and also the roughness and film thickness of the sliding surface and penetration affect those values. Moreover, it is proved by using three different methods that the snow crystals are molten by the heat of sliding friction.From these results together with those of the preceding experiments, it is concluded that sliding on the snow surface is able to be considered simply as one of the frictional phenomena of organic or inorganic crystals near melting point and not as a characteriftic phenomena of snow.

著者

新保 正樹 越智 光一 山田 光夫

出版者

公益社団法人 高分子学会

雑誌

高分子論文集 (ISSN:03862186)

巻号頁・発行日

vol.37, no.1, pp.57-63, 1980-01-25 (Released:2010-02-26)

参考文献数

16

被引用文献数

3 8

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ビスフェノール型エポキシ樹脂を促進剤の三級アミンまたはオクチル酸スズの存在する系と存在しない系とで脂肪族α, ω-ジカルボン酸を用いて硬化した. これらの系の硬化促進機構が引張Masaki SHIMBO強さや引張せん断強さ, 官能基の濃度およびゲル量の変化に基づいて検討された. その結果促進剤を添加した系では, 硬化物のエポキシ基反応率, 引張強さおよび引張せん断強さは促進剤を添加せぬ系とほぼ同じ値を示すが, 三級アミンまたはオクチル酸スズの添加によってその硬化時間は短縮された. また, これらの硬化物のけん化および反応率の変化から, 三級アミンによる促進系では硬化物のエステル結合の形成が選択的に促進されエーテル結合の抑制されることが示された.

著者

村上 惇 松下 裕臣 吉識 忠継 新保 正樹

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.34, no.384, pp.1099-1104, 1985-09-15 (Released:2009-06-03)

参考文献数

27

被引用文献数

2 2

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The morphology of phase-separation and the mechanical properties of amine cured rubber-modified epoxy resins were investigated.The results of the dynamic mechanical properties and the microscopic observations indicated that the epoxy-rich matrix phase was plasticized by the dissolved rubber and the rubber-rich domains were dispersed homogeneously in the epoxy-rich matrix.The rubber-modification of epoxy resins enhanced the fracture toughness against crack initiation and caused the crack arrest. The size of the plastic-deformed region at the crack tip was correlated well with the fracture toughness against crack initiation according to Dugdal's equation.From the fatigue crack propagation (FCP) tests at a low frequency it has been shown that the presence of rubber domains introduces the interfacial debonding between the domain and the matrix as the result of stress response, which promotes the FCP at the low stress intensity factor range.