巻号一覧
39 巻 (2013)
- 6 号 p. 212-
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- 3 号 p. 89-
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39 巻, 3 号
選択された号の論文の4件中1～4を表示しています
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研究論文
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金崎 真人, 斉藤 博嗣, 田中 基嗣, 北條 正樹, 金原 勲2013 年 39 巻 3 号 p. 89-98
発行日: 2013年
公開日: 2014/06/25
ジャーナル フリーIn this paper, the effect of thinning in ply-thickness on improvement of compression after impact (CAI) strength and the mechanisms in carbon fiber reinforced thermoplastics (CFRTP) was investigated. This improvement with thinning in ply-thickness was achieved by reduction of growth of fiber/matrix debondings inside each ply to transverse crack. Higher fracture toughness of matrix resin itself was also expected to contribute arresting the crack growth. By combining thinning in ply-thickness and higher fracture toughness of matrix, internal impact damage in CFRTP was dramatically suppressed. Two kinds of CFRTP laminates, in which one had 40 μm ply-thickness and the other had 120 μm ply-thickness, were prepared in order to observe the difference of morphology in internal impact damage and to evaluate the relation between CAI strength and projected impact damage area. Here, thickness of the both laminates was 3 mm. The projected impact damage area was measured with ultrasonic inspection. The effect of ply-thickness on initiation and propagation of internal impact damage, such as fiber/matrix debonding, delamination, and transverse crack, was discussed based on detailed cross-sectional observation of these internal damage with optical and laser microscope. In this study, polyamide 6 was used as matrix resin of CFRTP. Impact energy applied to CFRTP laminates was 1.5 J/mm.抄録全体を表示PDF形式でダウンロード (2556K) -
吉川 暢宏, 小笠原 朋隆, 中川 幸次郎, 岡崎 順二, 松本 隆之2013 年 39 巻 3 号 p. 99-105
発行日: 2013年
公開日: 2014/06/25
ジャーナル フリーThe spreading tow technique seems promising in application to filament wound or woven composites with advantageous strength enhancement mechanism. The effect of the tow spreading on the cure progress and the residual stress of resin is investigated in this study. We hypothesize that the homogeneous distribution of fibers realized by the spreading tow technique causes suppression of stress concentration of resin in the vicinity of close-packed fibers. The hypothesis is examined through the finite element simulation using micro-scale model with definite separation of fiber and resin. The residual stress and strain after cure process are investigated by means of newly developed simulation system.抄録全体を表示PDF形式でダウンロード (5045K) -
轟 章, 荒井 政大2013 年 39 巻 3 号 p. 106-112
発行日: 2013年
公開日: 2014/06/25
ジャーナル フリーAlthough an electrical-resistance-change method is useful for monitoring delamination cracking of Carbon Fiber Reinforced Plastics (CFRP) laminates, the method requires a lot of experiments or FEM analyses to obtain relationship between the electrical resistance changes and delamination cracking. In the previous studies, the author proposed the anisotropic electric potential function to analyze electric current density of CFRP laminates. The function was applied to thick CFRP laminates. In the present study, the method is expanded to thin CFRP laminates using an image method. The number of images is determined using the electric current analysis of thick CFRP laminates here. Electric potential changes caused by delamination cracking can be calculated using anisotropic doublet line. The anisotropic doublet method is applied here to calculate the electric voltage change at the surface of a thin CFRP laminate and the results are compared with FEM analysis. As a result, the method is shown to be very effective.抄録全体を表示PDF形式でダウンロード (962K) -
平野 啓之, 村松 秀隆, 井上 隆2013 年 39 巻 3 号 p. 113-119
発行日: 2013年
公開日: 2014/06/25
ジャーナル フリーCarbon fiber reinforced polypropylenes often exhibits poor mechanical properties because of short of bonding between fiber and matrix. Therefore, to fix the interfacial properties are important for material design. In this report, interfacial properties are studied quantitatively by interfacial share strength (IFSS) and evaluated the relationship between IFSS, composite strength and impact resistance. Composite strength and impact resistance are improved by increasing IFSS for fiber length is sufficiently short (like an injection molding). On the other hand, for composite with longer fiber length a superior impact resistance was observed with decreasing IFSS. Because longer fiber with low IFSS requires higher energy to pull out fiber from matrix than interfacial debonding.抄録全体を表示PDF形式でダウンロード (1644K)
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