Effect of interlaminar and intralaminar structure on fracture of high strength CFRP and optimization of mesoscopic structure

层间、层内结构对高强CFRP断裂的影响及细观结构优化

• 批准号: 08650106
• 负责人: HOJO Masaki
• 金额: $ 1.6万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650106/
• 关键词: Composite materials; Interlaminar fracture; Intralaminar fracture; Fatigue strength; Fracture toughness; Mesoscopic structure; Interface; Resin

Effects of interlaminar and intralaminar mesoscopic structures on the fracture toughness and fatigue crack growth resistance were investigated for CFRP laminates. In the present study, resin layrs at the prepreg interfaces and fiber/matrix interfacial strength were controlled. Comparison of interlaminar and intralaminar fracture properties was carried out to find out the role of resin rich layrs at the prepreg interface. A new type of heterogeneous resin for resin rich layrs which is composed of thermoplastic fine particles and epoxy of base lamina was also investigated. Finally, the effect of thickness and toughness of the resin rich layrs at the prepreg interface was separately analyzed, and the optimization of the resin rich layrs was discussed. The results are summarized as follows :1.Mode II interlaminar properties of CFRP laminates with heterogeneous resin at prepreg interfaceFracture toughness and fatigue crack growth resistance were improved up to the level of CFRP laminates wi … More th tough thermoplastic resin. This high toughness was kept with the increment of crack growth.2.Mode I and II interlaminar properties of thermoplastic resin interleaved CFRPPolyethylene base thermoplastic resin was put at the prepreg interface of CFRP laminates. The mode I fracture toughness was almost the same as that for CFRP laminates with thermoplastic resin matrix. This high toughness was kept with the increment of crack growth. For the case of mode II,the toughness was more than 10kJ/m^2, which was much higher than that for CFRP laminates with thermoplastic resin matrix.3.Effect of fiber/matrix interfacial strength on interlaminar and intralaminar fracture propertiesThe fracture toughness for mode I intralaminar tests increased with increasing surface treatment levels. The effect of the surface treatment on the fracture toughness for mode II interlaminar tests was smaller than that for mode I intralaminar tests. The fracture toughness for mode I interlaminar tests was insensitive to the surface treatment level for CF/epoxy laminates. The mesoscopic fracture mechanism was well correlated to the effect of the surface treatment on the basis of SEM observation. Less

研究了层间和层内细观结构对CFRP层合板断裂韧性和疲劳裂纹扩展抗力的影响。在本研究中，控制了预浸料界面的树脂层数和纤维/基质界面的强度。比较了层间和层内的断裂性能，以找出富树脂层在预浸料界面上的作用。研究了一种新型的由热塑性微粒和基片环氧树脂组成的富树脂层用多相树脂。最后，分别分析了预浸料界面富树脂层厚度和韧性的影响，并讨论了富树脂层的优化。主要研究结果如下：1.含非均质树脂的碳纤维复合材料层合板在预浸料界面具有II型层间性能，其断裂韧性和抗疲劳裂纹扩展性能均提高到…复合材料的水平。比热塑性树脂更坚韧。热塑性树脂交织CFRP聚乙烯基热塑性树脂的I型和II型层间性能放置在CFRP层压板的预浸料界面。其I型断裂韧性与热塑性树脂基碳纤维复合材料层合板的断裂韧性基本相同。随着裂纹扩展的增加，保持了较高的韧性。对于II型层合板，其韧性大于10kJ/m^2，远高于热塑性树脂基碳纤维复合材料层合板的韧性。3.纤维/基体界面强度对层间和层间断裂性能的影响I型层合板的断裂韧性随表面处理水平的增加而增加。对于II型层间试验，表面处理对断裂韧性的影响小于I型层间试验。碳纤维/环氧层压板的I型层间断裂韧性对表面处理水平不敏感。在扫描电子显微镜观察的基础上，细观断裂机制与表面处理效果密切相关。较少

项目成果

松田 聡: "先進CFRPのモードII層間はく離疲労に及ぼす樹脂靱性の効果" 強化プラスチックス. 42. 49-53 (1996)

Satoshi Matsuda：“树脂韧性对高级 CFRP 的 II 型分层疲劳的影响”《增强塑料》42. 49-53 (1996)。

北條正樹: "破壊力学とその特性評価" 材料. 46巻・5号. 568-574 (1997)

Masaki Hojo：“断裂力学及其特性的评估”材料，第 46 卷，第 5 期，568-574。

松田聡: "層間高靱化CFRPのモードII層間はく離疲労のメゾ破壊機構" 日本機械学会論文集,A編. 63巻603号. 39-45 (1997)

Satoshi Matsuda：“具有高层间韧性的 CFRP 的 II 型分层疲劳的细观断裂机制”，日本机械工程学会会刊，A 版，第 63 卷，第 603 期。39-45（1997 年）。

北條正樹: "一方向強化CF/PEEK積層板のモードII層間はく離疲労き裂伝ぱの破壊機構" 材料. 46巻4号. (1997)

Masaki Hojo：“单向增强 CF/PEEK 层压板中 II 型分层疲劳裂纹扩展的断裂机制”，第 46 卷，第 4 期（1997 年）。

日下 貴之: "層間高靱化CFRP材のモードI層間破壊じん性の負荷速度依存性" 日本機械学会論文集,A編. 63. 2359-2365 (1997)

Takayuki Kusaka：“具有高层间韧性的 CFRP 材料的 I 型层间断裂韧性的加载率依赖性”日本机械工程师学会会刊，A 版 63. 2359-2365 (1997)。