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

基本信息

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

项目摘要

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

在本内部裂缝中，研究了II和II下的骨折。，这种新的结果是较高的层间特性在离子层和碱基层中形成了相比，这些相互作用的混合物含有离子，环氧树脂和碳纤维的混合物。，高水平的韧性与裂纹生长有关。保持裂缝长度的额度不尊重，因为裂纹路径是在纤维上再次被固定的离子或相间区域的界面。 Anomer Film电影给出了不良的孔隙结果，用离子片的修复使Tougness与Virgin Laminates相当。