三维五向炭纤维/酚醛编织复合材料的压缩性能及破坏机制

针对不同编织角、 不同纤维体积分数的三维五向炭纤维/酚醛编织复合材料在不同温度下进行了纵向(编织方向)压缩和横向压缩试验 , 获得了其主要压缩力学性能 , 分析了编织参数、 温度对材料压缩力学性能的影响。对试件断口进行了宏观及扫描电镜观察 , 从宏、 细观角度研究了材料的变形及其破坏机制。结果表明 , 三维五向炭纤维/酚醛编织复合材料的压缩应力2应变曲线呈现明显的非线性特征 , 且温度效应明显; 编织角和纤维体积分数是影响材料压缩性能的主要参数。三维五向炭纤维/酚醛编织复合材料的纵向压缩与横向压缩具有完全不同的破坏机制。

Compressive properties and failure mechanism of three dimensional and five directional carbon fiber/phenolic braided composites

The compressive experiment s were performed for the three dimensional and five directional carbon fiber/ phenolic braided composites with different braiding angles and fiber volume f ractions in the longitudinal ( braiding)direction and t ransverse direction at different temperatures. The principal compressive properties of the composites were obtained. The influences of braiding parameters and temperature on the compressive properties were also ana2 lyzed. The macro and micro pictures of the f racture surface of specimens were observed in order to understand the deformation and the failure mechanism of the composites. The result s show that the compressive st ress2st rain curves of 3D &; 5D carbon fiber/ phenolic braided composites exhibit the nonlinear characteristics and the effect s of tempera2 ture are apparent . The braiding angle and the fiber volume f raction still were the most important parameters to affect the compressive properties of the composites. The longitudinal compressive failure of the composites is very different f rom the t ransverse compressive failure.