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针对局部受强瞬态热冲击作用下的四层热障涂层系统,采用非Fourier热传导定律,建立二维线弹性热力耦合方程组及相应边界条件和初始条件。对热障涂层的温度场和应力场进行模拟,并分析其可能产生破坏的原因。结果表明,热在涂层中是以波的形式传播的,并在界面上产生反射和叠加,具体给出了热波波前的传播路径。最高温度和最大应力总是出现在热波波前区域。由于材料性质不同,陶瓷层和氧化层界面产生热失配现象,可能会使界面处发生剥离,使涂层失效。
Aiming at the four-layer thermal barrier coating system under locally intense transient thermal shock, a two-dimensional elastic-plastic coupling equations and corresponding boundary conditions and initial conditions are established by using the non-Fourier heat conduction law. The temperature field and stress field of the thermal barrier coatings were simulated and the possible causes of the damage were analyzed. The results show that the heat propagates in the form of waves in the coating, and the reflections and superpositions are generated at the interface. The propagation paths before the wave are given. The maximum temperature and the maximum stress always appear in the front region of the thermal wave. Due to the different material properties, the thermal mismatch between the ceramic layer and the oxide layer may cause the interface to peel off, rendering the coating ineffective.