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分别对三维四向与三维五向编织C/C复合材料进行了弯曲和压缩试验,观测了两种材料在x向、y向与z向下的位移-载荷曲线,获得了弯曲和压缩的强度和模量数据。结果表明,三维五向C/C复合材料相比于三维四向C/C复合材料,因其本征结构的x向纤维分数增加和z向纤维分数减少使得x方向的弯曲和压缩的强度增加而z方向降低,两种结构的C/C复合材料均表现一种假塑性断裂行为。相比于预制体结构对压缩性能的影响,其对弯曲力学性能的影响更为明显。
The bending and compression tests of three-dimensional four-directional and three-dimensional five-directional braided C / C composites were carried out. The displacement-load curves of the two materials in the x, y and z directions were observed and the flexural and compressive strengths And modulus data. The results show that the three-dimensional five-directional C / C composites increase the bending and compressive strength in the x-direction compared with the three-dimensional four-directional C / C composites due to the increase of the x-directional fiber fraction and the z- While the z direction decreases. Both C / C composites show a pseudoplastic fracture behavior. Compared with the preform structure on the compression performance, its mechanical properties of bending more obvious.