Crack prediction in EB-PVD thermal barrier coatings based on the simulation of residual stresses

2016 Global Conference on Polymer and Composite Materials

材料科学;化学

Chen, J.W.^1 ; Zhao, Y.^1,2 ; Liu, S.^1 ; Zhang, Z.Z.^1 ; Ma, J.^1

NDT Lab, Laser Institute of Shandong Academy of Sciences, LISADA, Jinan, China^1

Centre of NDT Engineer and Technique in Shandong, Jinan, China^2

关键词: Crack prediction;    Elastic-Plastic;    Electron beam-physical vapor deposition;    Failure mechanism;    Failure prediction;    Interface model;    Interface morphologies;    Interfacial roughness;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/137/1/012068/pdf
DOI  :  10.1088/1757-899X/137/1/012068

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Thermal barrier coatings systems (TBCs) are widely used in the field of aerospace. The durability and insulating ability of TBCs are highly dependent on the residual stresses of top coatings, thus the investigation of the residual stresses is helpful to understand the failure mechanisms of TBCs. The simulation of residual stresses evolution in electron beam physical vapor deposition (EB-PVD) TBCs is described in this work. The interface morphology of TBCs subjected to cyclic heating and cooling is observed using scanning electron microscope (SEM). An interface model of TBCs is established based on thermal elastic-plastic finite method. Residual stress distributions in TBCs are obtained to reflect the influence of interfacial roughness. Both experimental and simulation results show that it is feasible to predict the crack location by stress analysis, which is crucial to failure prediction.