Improvement of fatigue life of plain-woven carbon fiber composite by highly polymerization of thermoplastic epoxy

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  • 熱可塑性エポキシ母材の高分子量化による平織炭素繊維複合材料の疲労寿命の向上に関する研究
  • ネツ カソセイ エポキシ ボザイ ノ コウブンシリョウカ ニヨル ヒラオリ タンソ センイ フクゴウ ザイリョウ ノ ヒロウ ジュミョウ ノ コウジョウ ニカンスル ケンキュウ

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The purpose of current study is to investigate the effect of weight-average molecular weight of the thermoplastic epoxy matrix on the fatigue life and its internal crack growth along carbon fiber bundle of the plain-woven CFRTP (Carbon Fiber Reinforced Thermo-Plastic). States of interlaminar and fiber/resin interface were observed after the bending fatigue test. Interlaminar fracture toughness and interfacial shear strength between fiber and resin were measured by ENF (End Notched Flexure) test and micro droplet test, respectively. To discuss the behavior of matrix crack propagations around reinforcing carbon fiber, the probability for connecting two matrix cracks initiated in the both sides of model specimen was measured after critical failure, when the molecular weight of the matrix was changed. The bending fatigue property was improved by increasing the molecular weight of the thermoplastic epoxy matrix. It was found that the interlaminar fracture toughness was improved by increasing the weight average molecular weight of the matrix, and the state of fracture surface was varied depending on the condition of weight average molecular weight of the matrix. Interfacial strength between fiber and matrix was also improved, when the weight average molecular weight of the matrix was elevated. The probability for connecting two off-set matrix cracks in the model specimen was reduced according to the elevation of molecular weight. It was found that the crack propagation along the interfacial between fiber and matrix was prevented due to the increase of interfacial shear strength, when the weight average molecular weight of the matrix was elevated.

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