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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

研究了含离聚物夹层的单向CF/环氧树脂层合板在I型和II型载荷下的层间断裂韧性。层间断裂的裂纹路径往往在层间树脂富集区内被阻止。在本研究中，增韧层间树脂扩展到层间/基板界面。由于裂纹路径位于增韧区内，因此这种新的增韧概念有望获得优异的层间性能。利用离聚体的高粘接性能，对脱层复合材料的修复性进行了尝试。（1）层间树脂结构的控制用厚度为12 ~ 200 mm的离聚物夹层模压单向CF/环氧层合板，EPMA分析表明，离聚物层与基体CF/环氧层合板之间形成了界面相。这些界面包含离聚物、环氧树脂和碳纤维的混合物。（2）层间断裂韧性断裂试验 ...更多信息在I型和II型载荷下，离聚物插入的CF/环氧树脂层合板的粗糙度都远高于基体CF/环氧树脂层合板。对于模式I加载，高水平的韧性保持恒定的裂纹扩展。（3）I型层间韧性随离聚物层间距的增加先增加后趋于平稳。对于模式II加载，韧性随着离聚物厚度的增加而不断增加，并达到9至10 kJ/m^2，这是已经报道的结果中最高的一个。（4）Ⅰ型分层疲劳由于裂纹路径位于离聚物/界面区或界面区内部，并受到纤维的阻滞，因此裂纹扩展阻力与裂纹长度的增加无关。（5）可修复性对分层后的试样进行二次热压处理，研究层间韧性的变化。虽然热压没有额外的离聚物膜给出了差的结果，与离聚物膜的修复带来了与原始层压板相当的韧性。少