三维编织碳/环氧复合材料力学性能测试及破坏机制

Mechanical properties testing and failure mechanism analysis of 3D woven carbon/epoxy composites

通过宏观拉压试验,研究了三维正交编织碳/环氧复合材料的拉伸和压缩力学性能。对试验过程进行了声发射分析,对断口进行了扫描电镜观察分析,给出了该类材料的拉伸和压缩破坏机制。结果表明:三维正交编织碳/环氧复合材料有良好的拉伸和压缩力学性能;三维正交编织复合材料在拉伸和压缩载荷作用下的断裂均为脆性断裂,拉伸试验的主要破坏现象是纤维断裂拔出,而压缩试验则是纤维剪切破坏;通过声发射参数分析可以基本判定该类材料损伤过程中的损伤类型。

The tensile and compressive properties of the 3D orthogonal woven carbon/epoxy composites were studied through the macro tensile and compression test,and acoustic emission（AE） analysis and SEM analysis of the fracture surface of the specimens were adopted in order to realize the failure mechanism of tensile and compression deeply.The results show that 3D orthogonal woven carbon/epoxy composites have superior mechanical performances about the tensile and compression.The damage of both tensile and compression is brittle fracture,and the main damage phenomenon of tensile is the broken and pull-out of the fiber,however,shear destruction of the fiber is the main factor of compression damage.Through the acoustic emission parameter analysis,the types of damage can be determined in the process of destruction.