基于格林函数的热障涂层结构热力耦合场分析

doi:10.7527/S1000-6893.2025.31764

Abstract

Abstract:

Thermal Barrier Coatings （TBCs） are one of the core technologies that ensure the service of high-performance aero-engine turbine blades， rocket engines thrust chamber walls， and other advanced equipment in extreme high-temperature environments. However， accurately calculating the structural thermo-mechanical coupled field remains a core challenge due to the interface complexity and discontinuity in TBCs. To address the bottle-neck problems such as poor convergence and low efficiency existing in the analysis of interface discontinuous fields by traditional numerical methods， we propose a refined calculation method for the thermo-mechanical coupled field of TBC structures based on the Green’s function theory. Utilizing the general solution of the material， a concise harmonic function containing undetermined constants is constructed and substituted into the general solution. The undetermined constants are determined by boundary conditions， interface conditions， and thermo-mechanical equilibrium conditions， yielding a comprehensive analytical solution for the thermo-elasticity of TBC structures. Based on the solution， the sensitivity analyses of parameters such as coating thick-ness and thermal expansion mismatch effect were systematically carried out， revealing the influence laws of coating thickness and thermal parameter mismatch on the interfacial stress field. This study provides a theoretical foundation for the precise design of TBC structures and for investigating interface failure mechanisms.

Key words: thermal barrier coatings, double-layer coating, thermal stress, Green’s function, transversely iso-tropic

CLC Number:

V259

Qiuhua LI. Thermal coupling field analysis of thermal barrier coating structure based on Green’s function[J]. Acta Aeronautica et Astronautica Sinica, 2025, 46(22): 431764.

Figures/Tables 10

Fig.1

Fig.2

Table 1

Material parameters of thermal barrier coatings

材料属性	基体	黏结层	热障涂层
$E z$ /GPa	211	200	60
$ν$	0.33	0.30	0.26
$α$ /（10^-6 ℃^-1）	14.8	13.6	10.4
$β$ / （W·m^-1·℃^-1）	21	16.2	4.53

Table 1

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

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Thermal coupling field analysis of thermal barrier coating structure based on Green’s function

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