弯曲纤维对SiO2f/SiO2复合材料拉伸强度的影响

Effect of Bending Fiber on Tensile Strength of SiO_(2f)/SiO_2 Composites

以SiO_(2f)织物作为增强相,采用循环浸渍固化工艺,制备了SiO_(2f)/SiO_2复合材料。在制备过程中,通过对SiO_(2f)织物进行模压处理,使SiO_(2f)呈现出不同程度的弯曲,测定了纤维弯曲后复合材料的拉伸强度,研究了纤维弯曲时复合材料的断裂过程。结果表明:弯曲纤维将导致复合材料的拉伸强度下降,最低拉伸强度仅为5.5 MPa,纤维弯曲时复合材料的断裂过程为逐层断裂,断裂应变增加,最大断裂应变达到1.19%。

SiO2f/SiO2 composites were prepared through repeated infiltration and solidification process,using quartz fabric. Quartz fiber waviness was generated by molding. The tensile strength of SiO2f/SiO2 composites with bending fibers were tested. The fracture process was studied. The results showed that bending fiber will lead to the decrease of tensile strength. The minimum tensile strength was 5. 5 MPa. The composites with curved fibers fractured layer by layer. The bending fiber will lead to the increase of fracture strain,the maximum fracture strain was 1. 19%.