热障涂层裂纹扩展的数值模拟研究进展  

Research Progress of Crack Growth of Thermal Barrier Coatings via Numerical Simulation

作　　者：胡忠超 王亮[2] 庄铭翔 张桓瑜 李广书 王铀[3] 杨勇[1] HU Zhongchao;WANG Liang;ZHUANG Mingxiang;ZHANG Huanyu;LI Guangshu;WANG You;YANG Yong(School of Materials Science and Engineering,Hebei University of Technology,Tianjin 300130,China;Integrated Computational Materials Research Centre,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201899,China;School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]河北工业大学材料科学与工程学院,天津300130 [2]中国科学院上海硅酸盐研究所集成计算材料研究中心,上海201899 [3]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《中国材料进展》2020年第10期740-753,739,共15页Materials China

基　　金：上海市自然科学基金项目(19ZR1479600);国家自然科学基金项目(51671208,91960107)。

摘　　要：大气等离子喷涂(APS)制备的热障涂层(TBCs)在热循环过程中由于热应力的累积引起热生长氧化物(TGO)界面周围裂纹的扩展,最终导致涂层的失效。深入了解热障涂层的裂纹萌生、扩展问题,对评估TBCs的可靠性和耐久性具有重要意义。实际上,在TBCs的制造和使用过程中,后续的实验表征方法并不能反映其真实情况。有限元计算(FEM)在这些问题的研究中起着重要的作用,特别是在计算热障涂层的隔热和断裂失效问题上非常有效。综述了有限元法在裂纹形态、裂纹位置、裂纹密度对涂层界面应力的影响及相关失效问题研究中的研究进展。随着有限元技术的发展,采用基于虚拟裂纹闭合技术(VCCT)、扩展有限元法(XFEM)和内聚力模型(CZM)研究TBCs的裂纹扩展行为,利用这些方法可以对TBCs的失效模式进行实时动态监测,最终实现TBCs在实际使用条件下的寿命预测。Crack propagation around the TGO(thermally grown oxide)interface are formed by the accumulation of thermal stress during the thermal cycling process,which leads to the failure of thermal barrier coatings(TBCs).To systematically understand the crack initiation and propagation of TBCs are vital to evaluate the reliability and durability of TBCs.In fact,the following experimental characterization methods after coating failure cannot reflect the real situation in the process of manufacturing and using TBCs.Finite element method(FEM)plays a significant role in the study of these problems,especially in the calculation of thermal insulation and fracture failure of TBCs.In this paper,the research progress of finite element method in the study of the influence of interface crack position,crack shape and crack density on the interface stress of coating and related failure problems is reviewed.The fracture mechanics method and the finite element method are used to calculate or simulate the failure of TBCs caused by cracks under the actual conditions.With the development of FEM technology,the crack growth behavior of TBCs has been simulated via the virtual crack closed technique(VCCT),extended finite element(XFEM)and cohesive zone model(CZM).The failure patterns of the TBCs can be monitored timely and dynamically considering these methods and the life prediction of the TBCs under the actual service conditions is expected to be realized eventually.

关 键 词：热障涂层 有限元分析 热力耦合 表-界面裂纹 界面应力 

分 类 号：TG174.44[金属学及工艺—金属表面处理] TG111.3[金属学及工艺—金属学]