????-FGM-???EFBF?????????????

为研究金属-FGM-陶瓷 EFBF 复合板的稳态热应力，从热传导规律出发，结合热应力计算公式，建立了该复合板稳态热应 力的研究模型，用有限元和辛普生法分析了T_a=500K和T_b=1800K时，该 复合板的稳态热应力分布并与无梯度两层复合板的结果进行了比较. 结果表明：FGM梯度层的厚度、组分和孔隙率对该EFBF复合板的热应力有不同程度的影响， 此外，有梯度三层复合板的热应力比较缓和，最大拉应力减小29.18%. 此结果为该复合板的设计和应用提供了准确的计算依据.

STEADY THERMAL STRESSES IN CERAMIC-FGM-METAL COMPOSITE PLATE UNDER EFBF MECHANICAL BOUNDARY CONDITIONS

In order to study the steady thermal stresses in ceramic-metal three-layered composite plate with an interlayer of FGM under EFBF mechanical boundary conditions,the analytical model for the steady thermal stresses in the composite plate was established,from heat conduction law and calculation formulas of thermal stresses.When T_a=500 K and T_b=1800 K,the steady thermal stress distribution of the composite plate was analyzed by the FEM and the Simpson method,and results were compared with that of nongraded two-layered plate.The paper gives the effects of thickness and composition and porosity in FGM gradient layer on thermal stresses of the composite EFBF plate,and it is shown that the thermal stress in graded three-layered plate is not significant and the maximum tensile stress reduces by 29.18%.The results provide a reference for the design and applications of the composite plate.