【摘要】 用有限元方法对热障涂层倒圆和倒角结构进行优化设计,研究倒圆和倒角的尺寸以及倾斜角对涂层中最大等效应力的影响。结果表明,过渡类型对涂层中最大等效应力影响极大。当在喷涂后对热障涂层边沿进行倒圆和倒角处理时,小角度倒角处理最好;当在喷涂前对基底边沿进行倒圆和倒角处理时,45°角倒圆处理具有最优的结果;但当在喷涂后对热障涂层局部区域进行倒圆和倒角处理时,小的倾斜角又是最安全的。此外,在倾斜角保持45°不变的前提下,当倒圆和倒角在厚度方向的长度等于涂层总厚度时涂层中的最大等效应力最小。更多还原

【Abstract】 Optimization design of chamfering and rounding structure for Thermal Barrier Coatings(TBCs) is investigated by the finite element analysis. The effect of the size and inclination angle on the residual stress of the TBCs is taken into consideration. The numerical results show that the value of the maximum equivalent stress is greatly affected by the types of transition. A small inclination angle in the rounded model is the best if chamfering or rounding the TBCs after spraying,while the value of 45° in the chamfered model is the safest when chamfering or rounding the substrate at the corner before spraying. But when chamfering or rounding the substrate at a local area,the smaller the inclination angle is,the safer the TBCs are. In addition,the maximum equivalent stress in the TBCs reaches the minimum when the removal length L in thickness direction is equal to the total thickness of coatings under conditions that the inclination angle is equal to 45°.更多还原