纤维增强金属基复合材料中轴向热残余应力分析

Analysis on Axial Thermal Residual Stress of Metal Matrix Composites Reinforced by Fiber

采用ANSYS有限元分析软件,通过显微复合材料模型,系统地分析了纤维直径、TiC中间层厚度、纤维体积分数和制备温度等因素对SiC纤维增强Cu基复合材料轴向热残余应力的影响特征。结果表明,纤维直径的变化并不影响热应力的大小,但直径越小应力梯度越大;TiC中间层的厚度变化对自身及基体中的应力影响较小;但制备温度的变化对TiC层中的热应力影响较大;纤维体积分数的变化对纤维和基体中的热应力也有着非常显著的影响。

The effects of fiber diameter, thickness of TiC interlayers, fiber volume fraction and fabrication temperature on the axial thermal residual stresses of the composites were systematically analyzed by the finite element analysis software ANSYS and microcomposite model. The results show that fiber diameter is irrelevant to the magnitude of thermal stresses; but the stress gradient is higher when the fiber diameter is smaller; the thickness variation of TiC interlayer has little impact on the stress in TiC and the matrix, while the fabrication temperature has significant effect on the stress in TiC layers; the variation of fiber volume fraction also has significant effect on the thermal stress in fibers and matrix.