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首页> 外文期刊>Journal of the European Ceramic Society >Modeling of thermal properties and failure of thermal barrier coatings with the use of finite element methods: A review
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Modeling of thermal properties and failure of thermal barrier coatings with the use of finite element methods: A review

机译：使用有限元方法对热障涂层的热性能和破坏进行建模：综述

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摘要

To understand the thermal insulation and failure problems of the thermal barrier coatings (TBCs) deeply is vital to evaluate the reliability and durability of the TBCs. Actually, experimental methods can not reflect the real case of the TBCs during its fabrication and service process. Finite element modeling (FEM) play an important role in studying these problems. Especially, FEM is very effective in calculating the thermal insulation and the fracture failure problems of the TBCs. In this paper, the research progress of the FEM on the study of the thermal insulation and associated failure problems of the TBCs has been reviewed. Firstly, from the aspect of the investigation of the heat insulation of the TBCs, the thermal analysis via FEM is widely used. The effective thermal conductivity, insulation temperature at different temperatures of the coating surface considering the thermal conduct, convection between the coating and the environment, heat radiation at high temperature and interfacial thermal resistance effect can be calculated by FEM. Secondly, the residual stress which is induced in the process of plasma spraying or caused by the thermal expansion coefficient mismatch between the coating and substrate and the temperature gradient variation under the actual service conditions can be also calculated via FEM. The solution method is based on the thermal-mechanical coupled technique. Thirdly, the failure problems of the TBCs under the actual service conditions can be calculated or simulated via FEM. The basic thought is using the fracture mechanic method. Previous investigation focused on the location of the maximum residual stress and try to find the possible failure positions of the TBCs, and to predict the possible failure modes of the TBCs. It belonged to static analysis. With the development of the FEM techniques, the virtual crack closure technique (VCCT), extended finite element method (XFEM) and cohesive zone model (CZM) have been used to simulate the crack propagation behavior of the TBCs. The failure patterns of the TBCs can be monitored timely and dynamically using these methods and the life prediction of the TBCs under the actual service conditions is expected to be realized eventually. Crown Copyright (C)( 2015 Published by Elsevier Ltd. All rights reserved.
机译：深入了解隔热涂层（TBC）的隔热和故障问题对于评估TBC的可靠性和耐久性至关重要。实际上，实验方法无法反映TBC在制造和维修过程中的真实情况。有限元建模（FEM）在研究这些问题中起着重要作用。特别是，有限元法在计算TBC的绝热和断裂破坏问题方面非常有效。本文综述了有限元法在TBC隔热及相关故障问题研究方面的研究进展。首先，从研究TBC的绝热方面出发，通过有限元法进行的热分析得到了广泛的应用。可以通过FEM计算有效的热导率，考虑到热传导的涂层表面在不同温度下的绝缘温度，涂层与环境之间的对流，高温下的热辐射以及界面热阻效应。其次，还可以通过FEM计算在等离子喷涂过程中引起的或由涂层和基材之间的热膨胀系数不匹配以及实际使用条件下的温度梯度变化引起的残余应力。求解方法基于热机械耦合技术。第三，可以通过有限元法对TBC在实际使用条件下的失效问题进行计算或模拟。基本思想是使用断裂力学方法。先前的研究集中在最大残余应力的位置上，并试图找到TBC的可能失效位置，并预测TBC的可能失效模式。它属于静态分析。随着有限元技术的发展，虚拟裂纹闭合技术（VCCT），扩展有限元法（XFEM）和内聚区模型（CZM）已被用来模拟TBC的裂纹扩展行为。利用这些方法可以及时，动态地监测TBC的失效模式，并有望最终实现实际使用条件下TBC的寿命预测。官方版权（C）（2015），Elsevier Ltd.保留所有权利。

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