三维五向碳/酚醛编织复合材料的拉伸性能及破坏机理

 对不同编织角、不同体积含量的三维五向碳/酚醛编织复合材料进行了纵向（编织方向）拉伸实验和横向拉伸的对比实验，获得了这些编织复合材料的主要拉伸力学性能。实验后对拉伸试件的断口进行了照相和扫描电镜观察，分析了材料的变形及其破坏机理。实验结果表明: 编织角仍是影响三维五向编织复合材料拉伸力学性能的主要因素，并且复合工艺的质量对复合材料的力学性能有重要影响。此外,发现三维五向碳/酚醛编织复合材料的横向拉伸与纵向拉伸具有完全不同的破坏机制。

Investigation of the Tensile Properties and Failure Mechanism of Integrally-braided 5D Carbon/Phenolic Composites

Longitudinal(braiding direction)tensile tests were performed for integrally-braided 5D carbon/phenolic composites with different braiding angles and fiber volume fractions,and transverse tensile tests were also done for comparison.The main mechanical properties were obtained.After the test,fracture morphology and microstructure observation were performed to further understand the deformation and the failure mechanism.The experimental results show that the braiding angle still has a primary influence on the mechanical properties of 5D composites,and the processing quality of 5D composites has significant influence on their mechanical properties.In addition,it is found that the longitudinal tensile failure mechanism of the composites is very different from the transverse tensile failure mechanism.