碳纤维三维编织复合材料的结构对拉伸和弯曲性能的影响

研究了碳纤维四步法三维四向、三维五向编织结构复合材料的拉伸和弯曲性能,以及结构参数-编织角的变化对其拉伸和弯曲性能的影响,并与层合复合材料作了对比性研究.结果表明,三维编织复合材料具有良好的力学性能,其拉伸强度可达810MPa、拉伸模量可达95.6GPa,弯曲强度可达829.03MPa、弯曲模量可达67.5GPa.同时,编织角和编织结构对复合材料性能有较大的影响.随着编织角的增大,复合材料的拉伸、弯曲强度和模量均减小;三维五向结构的拉伸、弯曲强度和模量均高于四向结构;在纤维体积含量相近的情况下,通过对编织角的设计,可以设计三维编织复合材料的性能.

Influence of Structures of Carbon Fiber Three Dimensional Braiding Composites on Their Tensile and Bending Properties

WT5BZ]The tensile and bending properties of 4-step three-dimensional four-direction and five-direction braiding composites were studied. The influence of the structural parameter-braiding angle on their mechanical properties were discussed.The mechanical properties of three-dimension braiding composites were compared with that of laminated composites. The results showed that 3-D braiding composites had better mechanical properties than laminated composites. The tensile strength of three-dimension braiding composites reached 810MPa, the tensile modulus was 95.6GPa, the bending strength was 829.03MPa, and the bending modulus was 67.5GPa. The braiding angle and braiding structure had a great influence on their mechanical properties. The strength and modulus of tensile and bending decreased with increase of the braiding angles. The strength and modulus of tensile and bending properties of 3-D five-direction structures were higher than that of 3-D four-direction structure. The mechanical properties of 3-D braiding composites were determined by designing their braiding structure.