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

基本信息

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

项目摘要

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

在本研究中研究了内部和腔内介质结构对裂缝的影响，并控制了纤维/纤维的树脂层。还研究了在预处理的斑点粒子和层层的环氧树脂。 CFRP的层压与异质性树脂在预处理和疲劳ACK增长耐药性下得到了提高，但CFRP层压层的水平更高了...尽管如此，虽然虽然不过，虽然虽然虽然不过，虽然虽然虽然不过，虽然虽然虽然不过，虽然虽然虽然虽然虽然虽然虽然不过，否虽然虽然虽然虽然虽然虽然是虽然的虽然虽然虽然虽然虽然虽然虽然虽然虽然虽然虽然虽然虽然虽然虽然是虽然虽然的，又虽然虽然虽然虽然虽然虽然虽然虽然虽然虽然虽然虽然虽然虽然仍然是裂纹生长的递增）。但仍将热塑性树脂的跨层间特性保持在裂纹生长的增量中。在CFRP的预处理中，模式I骨折与CFRP层压板的固定量相同，带有热塑性树脂矩阵。与CFRP相比，与热塑性树脂基质相比，纤维/基质界面强度对模式I I II的表面处理水平的影响增加了。对于II模式，用于模式I的韧性是II模式的固定测试