巻号一覧
33 巻 (2007)
- 6 号 p. 205-
- 5 号 p. 161-
- 4 号 p. 121-
- 3 号 p. 79-
- 2 号 p. 41-
- 1 号 p. 1-
33 巻, 6 号
選択された号の論文の6件中1～6を表示しています
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岡部 朋永, 石井 健介, 西川 雅章, 武田 展雄2007 年 33 巻 6 号 p. 205-212
発行日: 2007/11/15
公開日: 2009/08/11
ジャーナル フリーTensile strength of unidirectional CFRP composites was predicted by the numerical simulation plus size scaling technique. The fiber strength distribution used in the numerical simulation was determined from the fragmentation process in a single fiber composite. Since the experimental data was obviously not fitted with the normal Weibull distribution, we fitted them with the Weibull of Weibull (WOW) model considering the statistical distribution of scale parameters of fiber strength in normal Weibull model. Moreover, the constitutive law of the matrix was derived from the stress-strain curves of the angle ply laminates utilizing the micromechanics approach proposed by Tohgo et al. Based on these parameters, we simulated the tensile fracture of unidirectional CFRP composites with the spring element model. The predicted tensile strength by the numerical simulation plus size scaling has a good agreement with the experimental data.抄録全体を表示PDF形式でダウンロード (8141K) -
末益 博志2007 年 33 巻 6 号 p. 213-218
発行日: 2007/11/15
公開日: 2009/08/11
ジャーナル フリーA damage growth mechanism in a hoop layer of a cylindrical portion of a composite pressure vessel was analytically studied. The cylindrical portion was produced by winding finite width prepreg tape, and made of two layers which consist of a circumferentially wound hoop layer and an almost axially reinforced base angle-ply layer. The fibers of the hoop layer were slightly inclined from the circumferential direction for the tape to be wound without gap and overlapping each other. So, the hoop layer forms a very low angle-ply laminate. High tensile strains generated in both axial and hoop directions due to the high internal pressure may produce matrix cracks in the full depth of the hoop layer, because the surface unevenness of the damage due to the different fiber angle is very small as the crack just initiates. However, the damage growth is not simple in this case because the unevenness increases with the crack growth without fiber breakages. The growth of uneven damage was examined through a fracture mechanical study based on the channeling crack assumption, but found to be difficult. It is concluded that the crack growth must accompany some fiber breakages or fiber peel-off from the cracked surface.抄録全体を表示PDF形式でダウンロード (6273K) -
横関 智弘, 小笠原 俊夫2007 年 33 巻 6 号 p. 219-226
発行日: 2007/11/15
公開日: 2009/08/11
ジャーナル フリーThe energy release rate associated with crack growth in adhesive double cantilever beam (DCB) specimens, including the effect of residual stresses, was formulated using a beam theory. Because of the rotation of the unsymmetric arms in the adhesive DCB specimens due to temperature change, it is necessary to modify the evaluated fracture toughness of DCB specimens, particularly in the case of the large temperature change. In this study, it was shown that the difference between the apparent toughness and the true toughness due to the residual stresses can be calculated for the given specimen geometry and the thermo-mechanical properties, such as the coefficient of thermal expansion. The calculated difference of the energy release rates based on the present modification method is compared with that from FEM to verify the method. The residual stress effects on the evaluation of the adhesive fracture toughness are discussed.抄録全体を表示PDF形式でダウンロード (6276K) -
第2章構成素材と種類 不飽和ポリエステル樹脂今井 恒雄2007 年 33 巻 6 号 p. 227-231
発行日: 2007/11/15
公開日: 2009/08/11
ジャーナル フリーPDF形式でダウンロード (1364K) -
第2章構成素材と種類 エポキシ樹脂岸 肇2007 年 33 巻 6 号 p. 232-237
発行日: 2007/11/15
公開日: 2009/08/11
ジャーナル フリーPDF形式でダウンロード (2935K) -
第2章構成素材と種類 ビニルエステル樹脂今井 恒雄2007 年 33 巻 6 号 p. 238-242
発行日: 2007/11/15
公開日: 2009/08/11
ジャーナル フリーPDF形式でダウンロード (460K)
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