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首页> 外文期刊>International journal of applied mechanics and engineering >MODELING OF RESIDUAL STRESSES DEVELOPED IN THERMAL BARRIER COATINGS DURING THERMAL CYCLING
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MODELING OF RESIDUAL STRESSES DEVELOPED IN THERMAL BARRIER COATINGS DURING THERMAL CYCLING

机译：热循环过程中热障涂层中残余应力的建模

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摘要

Thermal barrier coatings (TBCs) are widely used on Ni-based superalloy components of gas turbine engines. Although several mechanisms for the failure of the TBCs have been suggested, it is largely accepted that the durability of these coatings is primarily determined by the residual stresses that are introduced due to the growth of the TGO during operation. In the present study, the residual stress build-up in a TBC system during thermal cycling is modeled. A two-dimensional plane strain finite element analysis is carried out. The model includes both flat and undulated growth fronts for the TGO layer. The stress distribution pattern in the TBC system in the case of a planar TGO front was found to be markedly different from that of an undulated front. The ceramic layer was found to be prone to delamination at concave undulations.
机译：隔热涂层（TBC）广泛用于燃气涡轮发动机的镍基高温合金部件。尽管已经提出了几种使TBC失效的机制，但人们普遍认为，这些涂层的耐久性主要取决于在操作过程中由于TGO的增长而引入的残余应力。在本研究中，对TBC系统在热循环过程中的残余应力进行了建模。进行了二维平面应变有限元分析。该模型包括TGO层的平坦和波状增长前沿。发现在平面TGO正面的情况下，TBC系统中的应力分布模式与起伏的正面显着不同。发现陶瓷层在凹入的起伏处易于分层。

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