The influence of axial loading on the interface stresses of thermal barrier coatings

被引：18
|
作者：
Baeker, M. [1 ]
Roesler, J. [1 ]
Affeldt, E. [2 ]
机构：
[1] Tech Univ Carolo Wilhelmina Braunschweig, D-38106 Braunschweig, Germany
[2] MTU Aero Engines, D-80995 Munich, Germany
来源：
COMPUTATIONAL MATERIALS SCIENCE | 2009年 / 47卷 / 02期
关键词：
Thermal barrier coating; Finite element modeling; Thermo-mechanical fatigue; Failure mechanism; DELAMINATION; MECHANISMS;
D O I：
10.1016/j.commatsci.2009.09.012
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this paper, a thermal barrier coating system is studied numerically using finite elements. If the system is isothermally compressed, large stresses at the coating interface may develop due to the differences in Young's modulus. Since the coefficient of thermal expansion of the substrate differs from those of the coating materials, axial loading of the coating system is also relevant upon cooling. By artificially changing the coefficient of thermal expansion of the coating materials, the effect of axial loading and of stresses due to thermal differential strains in radial direction can be evaluated. Consequences for mechanical loading are discussed, showing that out-of-phase loading of a TBC system unloads critical regions of the TBC on the microscale. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：466 / 470
页数：5
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