采用ANSYS有限元软件计算涂层法制备的SCS-6 SiC/Ti-6Al-4V复合材料内热残余应力,分析了界面性能对热残余应力的影响。结果表明：较高的热膨胀系数（CTE）导致界面层产生高的应力梯度,使环向残余应力由低热膨胀系数时的压应力转变为较高的热膨胀系数时的拉应力;界面层弹性模量的增加,使得纤维和界面层内径向残余压应力明显增加,但对基体中的残余应力影响并不大;界面层厚度的变化对基体中径向残余应力影响不大,但随着界面层厚度增加,基体中残余应力有所减小。
Effect of interracial properties on thermal residual stress in SCS-6 SiC/Ti-6A1-4V composite was analyzed by finite element method. The results indicate that large residual stress gradient in interfacial layer is obtained due to high coefficient thermal expansion （CTE） and the hoop residual compressive stress at low CTE transfers to the tensile stress at high CTE. Radial residual stress in fiber and interfaeial layer increases with increasing elastic modulus of interracial layer, but little influence on the residual stress of matrix is observed. The increasing of interfacial layer thickness gives a little effect on the residual stress in matrix, but makes the residual stress slightly decrease.
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