日本複合材料学会誌

自動車の安全設計と信頼性向上に貢献する複合材料技術―III

NEDOプロジェクト:革新的温暖化対策技術プログラム「自動車軽量化炭素繊維強化複合材料の研究開発動向」の概説

北野彰彦, 山口晃司

2006 年 32 巻 5 号 p. 193-197
発行日: 2006/09/15
公開日: 2009/08/11

DOIhttps://doi.org/10.6089/jscm.32.193

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縫合CFRP積層材の引張負荷下における損傷進展挙動

吉村彰記, 矢代茂樹, 岡部朋永, 武田展雄

2006 年 32 巻 5 号 p. 198-207
発行日: 2006/09/15
公開日: 2009/08/11

DOIhttps://doi.org/10.6089/jscm.32.198

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This study investigated the tensile damage progress in stitched laminates experimentally and numerically. Particularly, the effects of stitching on the damage progress was focused. First, it was experimentally confirmed that ply cracks and delamination appeared under loading regardless of the stitching. We then performed damage extension simulation for stitched laminate using a layer. wise finite element model with beam elements as stitch threads, in which the damage (ply cracks and delamination) was represented by cohesive elements. The detailed comparison between the observa-tion and the simulated results confirmed that stitching has few effects on the onset and the accumula-tion of the ply cracks. Furthermore, we demonstrated that the stitch threads significantly suppresses the extension of the delamination.

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埋め込みFBGセンサを用いた有孔積層板の損傷同定に関する数値解析および実験結果への適用

矢代茂樹, 村井一恵, 岡部朋永, 武田展雄

2006 年 32 巻 5 号 p. 208-217
発行日: 2006/09/15
公開日: 2009/08/11

DOIhttps://doi.org/10.6089/jscm.32.208

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This study proposes two new approaches for estimating the damage patterns in a holed CFRP cross-ply laminate using an embedded fiber Bragg grating (FBG) sensor. It was experimentally confirmed that the reflection spectrum from the embedded FBG sensor drastically changed as the damage near the hole, i.e. splits, transverse cracks and delamination, extended. The damage patterns were predicted using forward analysis (a damage analysis and an optical analysis) with strain estimation and the proposed damage-identification method as well as the forward analysis only. The forward analysis with the strain estimation then to be yielding the best prediction from the viewpoint of the accuracy in estimating the damage pattern and the computational efficiency. Furthermore, the proposed damage identification achieved a significant reduction in the computational time and the equivalent accuracy compared to the conventional identification procedure, adopting the damage pattern obtained by the damage analysis as the initial estimation.

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PLA/PCLポリマーブレンドの相構造制御と破壊特性

高山哲生, 東藤貢, 新川和夫, 辻秀人

2006 年 32 巻 5 号 p. 218-225
発行日: 2006/09/15
公開日: 2009/08/11

DOIhttps://doi.org/10.6089/jscm.32.218

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Phase morphology of blends of biodegradable polymers, PLA and PCL, was controlled by introducing an additive, LTI, to improve the mechanical properties of the mixture. Fracture properties such as the J-integral at initiation J_in, and the total fracture energy J_f, of PLA/PCL blends with different LTI contents were evaluated, and were compared to assess the effect of LTI content on these properties. Both J_in and J_f values were dramatically improved by LTI addition. Fracture surfaces were also examined using SEM to characterize the effect of LTI addition on the fracture mechanism. It was confirmed that the size of PCL spherulites became smaller due to the activation of LTI as a surface-active agent. As a result, void formation was inhibited, and plastic deformation to be larger, resulting the improvement of fracture properties.

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書評

島村佳伸

2006 年 32 巻 5 号 p. 228
発行日: 2006/09/15
公開日: 2009/08/11

DOIhttps://doi.org/10.6089/jscm.32.228

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