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通过提取2.5维C/SiC复合材料经纱边界曲线,采用鲁棒最小二乘拟合得到了经纱轴向函数表达式,对拟合后的曲线进行合理简化,建立了参数化的2.5维C/SiC复合材料的有限元模型.采用双尺度模型对2.5维C/SiC复合材料进行刚度预测,分别为考虑纤维/基体/孔隙的微观尺度和考虑经纱/纬纱/孔隙的单胞尺度模型,刚度预测的方法采用刚度平均法和能量法.最后讨论了微观尺度的孔隙率对2.5维C/SiC复合材料弹性模量的影响.结果表明,刚度平均法和能量法的计算结果差异较小,考虑微观孔隙率后,计算结果与试验结果吻合得更好.
By extracting the warp boundary curves of 2.5-dimensional C / SiC composites, the expression of axial function of warps was obtained by using the robust least squares fitting, and the fitting curve was reasonably simplified. The parameterized 2.5-D C / SiC The finite element model of the composite was established.The two-dimensional model was used to predict the stiffness of the 2.5-dimensional C / SiC composites, respectively, considering the microscopic scale of fiber / matrix / pore and the single-cell scale model considering warp / weft / The influence of micro-scale porosity on the elastic modulus of 2.5-dimensional C / SiC composites was discussed.The results show that there is little difference between the calculated results of the stiffness averaging method and the energy method, considering the microscopic pores After the rate, the calculated results are in good agreement with the experimental results.