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采用ANSYS软件建立纤维四方排布、四方对角排布和六方排布的三维有限元模型,分析了纤维体积分数对各种纤维排布方式下SiC/Ti-6Al-4V复合材料界面径向、轴向、周向和剪切残余应力的影响规律。结果表明,3种纤维排布方式下纤维一侧界面径向和周向残余压应力均随纤维体积分数的增加而减小,且当纤维体积分数大于25%时界面径向和周向残余应力沿纤维周向分布的不均匀性也随纤维体积分数的增加而增加,但纤维六方排布时这种不均匀性增加的幅度远低于四方和四方对角排布时增加的幅度,即高纤维体积分数下纤维六方排布的优势更为明显;界面轴向残余应力基本不受纤维排布方式和纤维体积分数的影响沿纤维周向始终均匀分布,其大小主要取决于纤维体积分数,体积分数越高,轴向残余压应力越小;各个纤维体积分数下试样端面附近θ=0°位置界面剪切残余应力均大于θ=45°位置,使得纵向拉伸或纤维顶出试验过程中界面的脱粘优先于θ=0°位置。
ANSYS software was used to establish the three-dimensional finite element model of square, square diagonal arrangement and hexagonal arrangement of fiber, and the effect of fiber volume fraction on the radial and axial distribution of SiC / Ti-6Al-4V composite under various fiber arrangement was analyzed. Axial, circumferential and shear residual stress of the law. The results show that the radial and circumferential residual compressive stresses at the fiber-side interface decrease with the increase of the fiber volume fraction under the three fiber arrangement modes, and the radial and circumferential residual stress at the fiber interface when the fiber volume fraction is more than 25% The inhomogeneity along the fiber circumference also increases with the increase of the fiber volume fraction, but the increase of the nonuniformity when arranged in the hexagonal fiber is much lower than that of the tetragonal and tetragonal diagonal arrangement, ie, high The fiber hexagonal arrangement of fiber volume fraction advantage is more obvious; axial residual stress basically independent of the fiber arrangement and fiber volume fraction of the fiber along the fiber is always evenly distributed, its size depends on the fiber volume fraction, the volume The higher the fraction is, the smaller the axial residual compressive stress is; the residual shear stress at the interface θ = 0 ° in the vicinity of the end face of each fiber is larger than that of θ = 45 ° at each fiber volume fraction so that the longitudinal stretching or fiber ejection test Debonding of the interface takes priority over the position of θ = 0 °.