巻号一覧
20 巻 (1994)
- 6 号 p. 215-
- 5 号 p. 173-
- 4 号 p. 131-
- 3 号 p. 91-
- 2 号 p. 57-
- 1 号 p. 1-
20 巻, 5 号
選択された号の論文の5件中1～5を表示しています
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スポーツ材料と感性:スキー板の開発とその評価方法田中 浩1994 年 20 巻 5 号 p. 173-177
発行日: 1994/10/15
公開日: 2009/08/11
ジャーナル フリーPDF形式でダウンロード (1881K) -
棚橋 良次1994 年 20 巻 5 号 p. 178-186
発行日: 1994/10/15
公開日: 2009/08/11
ジャーナル フリーThe use of dissimilar materials and the design of rigidity distribution are effective in improving the performance of skis. The complication of the composite structures makes it extremely difficult to apply the generally known Saint Venant's torsion theory to skis. Therefore, an approximate calculation method derived from the theory of the thin-walled close structure is proposed as a calculation method of solving a complicated structural problem instead of using Saint Venant's torsion theory. The calculation method is applicable to the structure composed of the multiple high-elasticity layer skins and a low-elasticity core. Then, six different experiments were conducted on a simplified model and skis to prove the usefulness of the formula. As a result, this formula was proved to be useful enough. Thus, the conventional trial-anderror method of research and development has been improvement greatly.抄録全体を表示PDF形式でダウンロード (6897K) -
早川 栄太, 塩谷 正俊, 斎藤 徹, 高久 明1994 年 20 巻 5 号 p. 187-194
発行日: 1994/10/15
公開日: 2009/08/11
ジャーナル フリーAn apparatus measuring the compressive behavior of single fibers in the transverse direction conveniently with sufficient accuracy was developed. In this apparatus, a single fiber was compressed between two glass plates, and the compressive displacement of the fiber was determined by applying the optical interference occurring between the two glass plates. By using this apparatus, the compressive behavior of a series of PAN-based and pitch-based carbon fibers were investigated, and the following features were ascertained : 1) carbon fibers can be deformed reversibly by the transverse compression up to a displacement corresponding to about 10% of diameter ; 2) as the fiber is compressed in the transverse direction, the compressive deformation becomes more difficult for PAN-based carbon fibers, while for pitch-based carbon fibers, the compressive deformation becomes easier; 3) the transverse modulus tends to decrease with increasing crystallite orientation to the fiber axis direction. The experimentally observed relationship between the transverse modulus and the crystallite orientation can not be explained by the fiber structure models assuming that uniform stress or uniform strain is applied to the crystallites randomly distributed in a fiber cross-section. This suggests that the transverse modulus changes dependently on the fiber texture composed of crystallite aggregates. The transverse compressive strength of pitch-based carbon fibers decreased with increasing crystallite orientation. The SEM photographs of the fractured fibers are shown.抄録全体を表示PDF形式でダウンロード (6714K) -
下河 利行, 濱口 泰正, 角田 義秋, 三本木 茂夫, 森野 美樹, 山本 昌孝1994 年 20 巻 5 号 p. 195-204
発行日: 1994/10/15
公開日: 2009/08/11
ジャーナル フリーThe objective of this study is to statistically evaluate tensile mechanical properties of two kinds of carbon/polyimide composites, i.e., Celion 6K/PMR-15 and T800H/PMR-15 with a quasi-isotropic stacking sequence. Tensile tests were conducted under room temperature using about thirty smooth specimens each. Mechanical properties measured are ultimate strength, failure strain, elastic modulus, and Poisson's ratio. Statistical analyses use four kinds of distribution models such as normal, log-normal, type-I extreme-value, and two-parameter Weibull distributions. These analyses derive the estimates of central tendencies and scatter parameters, and B allowables. Moreover, the modified Kolmogorov-Smirnov goodness-of-fit test for the four kinds of distribution models is applied for the data of each mechanical property. Correlation between mutual mechanical properties is examined, and a multiple regression analysis applied to predict the ultimate strength.抄録全体を表示PDF形式でダウンロード (1192K) -
武田 展雄1994 年 20 巻 5 号 p. 214
発行日: 1994/10/15
公開日: 2009/08/11
ジャーナル フリーPDF形式でダウンロード (174K)
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