碳纤维增强树脂基复合材料压缩失效机理研究

为分析基体性质和纤维铺设方式对碳纤维树脂基复合材料(CFRP)压缩性能的影响，设计两种基体（耐高温环氧树脂基体和PA6 基体） 和两种碳纤维铺设方式45/0/-45/90]s和45/-45]2s]，共4 类盒型碳纤维试件．采用轴向压缩实验，研究低应变速率下碳纤维复合材料的极限载荷、压缩量和刚度等力学性能．研究表明试件的失效形式主要由基体性质决定，损伤区域及裂纹方向主要由碳纤维铺设方式决定．利用X射线显微镜(XRM)对试件典型的损伤区域进行三维扫描，并对扫描图像进行重构与渲染，获得破坏区域的内部损伤细节．根据损伤扫描结果，得到材料内部的损伤类型及破坏程度．归纳所获得的损伤测试特征，分析不同类型试件压缩时的损伤规律与失效机理．

Study on Compression Failure Mechanism of Carbon Fiber Reinforced Resin Matrix Composites

In order to analyze the influence of matrix properties and fiber laying schemes on the compression performance of carbon fiber reinforced plastics (CFRP), two matrixes (high temperature resistant epoxy resin matrix and PA6 matrix) and two carbon fiber laying schemes (45/0/-45/90]s and 45/-45]2s), a total of 4 types of box-type carbon fiber specimens are designed. The axial compression experiment is used to study the mechanical properties of carbon fiber composites such as the ultimate load, the compression ratio and the stiffness at low strain rates. The results show that the failure mode is mainly determined by the properties of the matrix. The damage area and crack direction are mainly determined by the laying scheme of carbon fibers. X-ray microscope (XRM) is used to scan the typical damage area of the specimen in three dimensions, and the scanned image is reconstructed and rendered to obtain the internal damage details of the damaged area. According to the damage scan results, the type and extent of damage inside the material can be obtained. The obtained characteristics of the damage test are then summarized to analyze the damage law and the failure mechanism of different types of specimens when they are compressed.