Toughening and repairability of high-strength CFRP by interlayer resin structure control

层间树脂结构控制高强CFRP的增韧及修复性

• 批准号: 10650085
• 负责人: HOJO Masaki
• 金额: $ 2.5万
• 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: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650085/
• 关键词: Composite Materials; Delamination; Fracture toughness; Fatigue crack growth; Mesoscopic structure; Mode I; Mode II; Interphase; 樹脂; Composite Materials; Delamination; Fracture toughness; Fatigue crack growth; Mesoscopic structure; Mode I; Mode II; Interphase; 樹脂

Interlaminar fracture toughness under mode I and II loadings was investigated for unidirectional CF/epoxy laminates with ionomer interleaf. Crack path of interlaminar fracture is often arrested within the interlayer resin rich region. In the present study, the toughened interlayer resin was expanded to the interlayer/base lamina interphase. Since the crack path was located inside the toughened region, excellent interlaminar properties are expected by this new toughening concept. Using the high bonding properties of ionomer, the repairability of delaminated composites was also tried. The results are summarized as follows :(1) Control of interlayer resin structureUnidirectional CF/epoxy laminates was molded with ionomer interleaf of the thickess of 12 to 200 mm. EPMA analysis revealed that interphases were formed between the ionomer layer and the base CF/epoxy laminas. These interphases contain a mixture of ionomer, epoxy and carbon fibers.(2)Interlaminar fracture toughnessThe fracture t … More oughness of ionomer interleaved CF/epoxy laminates was much higher than that of base CF/epoxy laminates both under mode I and II loadings. For mode I loading, the high level of the toughness was kept constant with the crack growth.(3)Ionomer thickness effectMode I interlaminar toughness initially increased with the increase of ionomer interleaf, and then leveled off. For mode II loading, the toughness continuously increased with the ionomer thickness, and reached 9 to 10 kJ/m^2, which is one of the highest among already reported results.(4)Mode I delamination fatigueHigh crack growth resistance was kept without respect to the increment of the crack length because the crack path was at the interface of the ionomer/interphase or inside the interphase region, arrested by fibers.(5)RepairabilityThe delaminated specimen was hot-pressed again, and the interlaminar toughness change was investigated. Although hot-pressing without additional inomer film gave poor results, the repair with ionomer film brought the toughness comparable to the virgin laminates. Less

研究了模式I和II载荷下的层间断裂韧性，用于用离子层层次的单向CF/环氧层压板进行离子层层次。层间骨折的裂纹路径经常在层间富含树脂富区域内被捕。在本研究中，将硬化的层间树脂扩展到层间/底层层间相。由于裂纹路径位于韧性的区域内，因此这种新的韧性概念可以预期出色的层间特性。使用离子体的高键合特性，还尝试了分层组成的可修复性。结果总结如下：（1）控制层间层结构的CF/环氧层压板的控制，用12至200 mm的厚度的离子体杂交模制。 EPMA分析表明，离子层和基础CF/环氧层片之间形成了相互作用。这些相互强度含有离子体，环氧和碳纤维的混合物。（2）层间断裂韧性骨折t…离子体交织的cF/环氧层压板的更多伴侣远高于基础CF/Epoxy在模式下和II和II载荷下的基础CF/环氧树脂的层压板。对于MODI I负载，随着裂纹的生长，高水平的韧性保持恒定。（3）离子厚度效应I Interlaminar韧性最初随着电离剂中断的增加而增加，然后升级。模式II载荷，韧性随着离子厚度的持续增加，达到9至10 kJ/m^2，这是已经报道的结果中最高的。（4）模式I I分层疲劳裂纹的抗裂纹耐药性不得保持裂纹长度，因为裂纹的长度是在裂纹路径上的增加，因为裂纹是在维修界面的界面，而在Irompase的界面上，限制了（限制），该区域的界面是限制的（限制），该区域是限制的（限制），（标本再次受到热压，并研究了层次韧性的变化。尽管没有额外的录制膜的热压效果不佳，但带有离子膜的维修使韧性与维京层层覆盖物相当。较少的