On oxide growth fracture analysis of thermal barrier coatings based on a three-dimensional chemo-mechanical model
On oxide growth fracture analysis of thermal barrier coatings based on a three-dimensional chemo-mechanical model
复制标题
基于三维化学力学模型的热障涂层氧化物生长断裂分析
DOI：
10.1016/j.mtcomm.2022.103793
复制
发表时间：
2022
影响因子：
3.8
通讯作者：
Q.R. Guo
中科院分区：
文献类型：
--
作者：
D.H. Li;F.Y. You;Y.H. Liu;Q.R. Guo
化学机理是热障涂层（TBC）中热生长氧化物（TGO）的主要驱动力，氧化物生长损伤的重要来源是局部附加的永久膨胀和形状变形。本文建立了基于化学机械扩展分层方法（CM-XLWM）的三维化学机械模型来探索TGO生长，并对有损伤的TBC进行了氧化物生长分析。考虑了化学反应和离子膨胀的贡献。对 TBC 中的高环境温度氧化进行了数值模拟，以证明这种物理现象的机理。建立化学-机械耦合断裂分析，深入探讨TGO生长原理和应力状态。考虑了界面裂纹、横向裂纹及其组合，并研究了TGO生长与TBC断裂之间的相互作用。
The chemical mechanism is the main driven force of the thermally grown oxide (TGO) in thermal barrier coatings (TBCs), and the considerable derives of oxide growth damage are the locally additional perpetual swelling and shape deformation. A three-dimensional chemo-mechanical model is developed to explore the TGO growth based on the chemo-mechanical extended layerwise method (CM-XLWM), and the oxide growth analysis is also carried out for the TBCs with damage in this paper. The contributions of chemical reaction and ionic expansion are taken into account. The numerical simulations of the high-ambient temperature oxidation in TBCs are implemented to demonstrate the mechanism of this physical phenomenon. The chemo-mechanical coupling fracture analysis is established to delve into the principle of TGO growth and the stress states. The interface crack, transverse crack and their combination are considered, and the interactions between the TGO growth and TBC fracture are investigated as well.