碳/环氧复合材料管失效分析

Failure Analysis of Carbon Fiber/Epoxy Composite Pipe

碳/环氧复合材料管在弯曲疲劳试验时发生开裂,疲劳次数远低于设计要求。管子的成型工艺为碳布缠绕成型。对碳/环氧复合材料管裂纹部位进行了宏观、微观观察,对环氧树脂基体采用红外光谱分析。观察和分析结果表明:碳/环氧复合材料管的失效性质为低周疲劳;复合材料管发生早期疲劳失效的主要原因是由于安装孔附近存在分层缺陷,导致该区域层间结合强度及抗疲劳性能降低,分层缺陷产生的原因是由于该区域富集较多的环氧树脂用粉末状固化剂。

Carbon fiber/epoxy composites pipe cracked during bending fatigue test. The fatigue life is far lower than that of design requirement. Carbon fiber/epoxy composites pipe was made by wrapping carbon clothes. In order to find out the failure cause, macro and micro observation and infra-red spectrum analysis were carried out. The results show that there existed delamination defect near the mounting holes, resulting in the decrease in interlayer bond strength and fatigue property of this area. The reason for the delamination defect was that there existed a high amount of powder solidified agent at this area.