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通过试验研究了2.5维自愈合C/SiC复合材料(2.5D-C/SiC)的面内弹性性能.基于复合材料的细观结构,建立了2.5D-C/SiC的弹性模量预测模型.预测结果与试验值吻合较好,证明了模型及计算方法的正确性.研究发现,随着纤维束中纤维数的增大,经纱方向纤维的体积含量和拉压模量均增大,面内剪切模量几乎无变化,纬纱方向纤维的体积含量和其余模量均降低.随着经纱编织角度的增加,经纱方向纤维的体积含量和拉压模量均降低,面内剪切模量变化很小,纬纱方向纤维的体积含量和其余模量均增大.保持碳化硅与碳化硼体积分数的总和不变,随着碳化硼与碳化硅体积比的增加,弹性模量均逐渐降低,降低幅度很小.
The in-plane elastic properties of 2.5-D self-healing C / SiC composites (2.5DC / SiC) were investigated experimentally.The elastic modulus prediction model of 2.5DC / SiC was established based on the mesostructures of the composites.The prediction results were in agreement with The experimental results are in good agreement, which proves the correctness of the model and the calculation method.It is found that with the increase of the number of fibers in the fiber bundle, the volume content and tensile modulus of the fibers in the warp direction increase, The amount of fiber in the direction of weft yarn and the remaining modulus decreased.With the increase of warp knitting angle, the volume content and tensile modulus of fiber in the direction of warp yarn decreased, the in-plane shear modulus changed little, The volume content of the fiber in the weft direction and the remaining modulus are all increased, the total volume fraction of silicon carbide and boron carbide remains the same, and the elastic modulus decreases and decreases with the increase of the volume ratio of boron carbide and silicon carbide .