环状针刺C/C复合材料的压缩性能及破坏机理

以碳纤维针刺毡为预制体,采用CVI致密工艺制作准三维C/C薄壁回转体,具有各向异性的力学性能.本文主要对三个主方向的材料压缩性能及破坏机理进行了研究讨论.结果表明:轴向压缩与环向压缩性能相似具有较高的压缩模量.材料的径向压缩表现为假塑性断裂行为,在材料的断裂面上具有大量纤维及基体碎屑,材料发生剪切破坏及基体压溃破坏.材料的轴向压缩与环向压缩表现为脆性断裂行为,材料主要以分层劈裂方式破坏.

CompressivePropertiesandFractureMechanismofCylindricalNeedledFeltCarbon/CarbonComposites

The carbon/carbon composites ring prepared by chemical vapor infiltration(CVI) with needled felt as preform is anisotropy.Their compressive properties and fracture mechanism of three principal directions were studied.The results show that the axial compressive properties are similar to the hoop compressive properties with higher compressive modulus.The needled felt carbon/carbon composites exhibit quasi-ductile fracture behavior under radial compression.Many small fragments of fibers and matrix carbon on th...