Analysis of Steady Thermal Stress in a ZrO2/FGM/Ti-6Al-4V Composite ECBF Plate with Temperature-Dependent Material Properties by NFEM

A NFE model is constructed to analyze the heating steady thermal stress in a ZrO₂/FGM/Ti-6Al-4V composite ECBF plate considered temperature dependency. From numerical calculation, when T₀ = 300 K T_a = 670 and T_b = 1 070 K, the stress distributions in the plate were obtained. The results are as follows. The change of the FGM layer thickness is little effect on the stress in metal layer. Compared with M = 0.1, when M = 10, the stress difference on the ceramic surface is 133.9 MPa, and the tensile stress at the interface between FGM and ceramic layers reduces by 52.3%. Compared with A = 3.99, when A = 0, the tensile stress on the ceramic surface reduces by 96.2%. When T₀ = 300 K, T_a = 700 K, compared with T_b = 1 800 K, when T_b = 1 050 K, the tensile stress in the plate reduces by 84.1%, and the maximum stress difference on the surface of ceramics is 1610.8 MPa. Compared with the nongraded two-layered ceramic/metal composite plate, the thermal stress of ZrO₂/FGM/Ti-6Al-4V composite ECBF plate is very gentle and smooth. The stress in graded three-layered composite plate considered temperature dependency becomes small obviously, and the maximum tensile stress on the metal surface reduces by 30.1%, and the maximum compressive stress on the ceramic surface reduces by 9.49%. The results provide the foundations of theoretical calculation for the design and application of the composite plate.