讲座时间：2026年11月6日上午10:00

讲座地点：X30280

讲座题目：Failure and damage evaluation of thermal barrier coatings in gas turbine engines: multi-physics modeling

主讲 人：Xin Wang

个人简介：

Xin Wang is currently a Chancellor’s Professor (since 2024) and Professor (since 2011) in the Department of Mechanical and Aerospace Engineering at Carleton University (Ottawa, Canada), following earlier academic appointments there and industrial experience as a Senior Design Engineer in Nuclear Engineering at Babcock and Wilcox Canada. His key achievements include being listed among Stanford University’s Top 2% Most Highly Cited Scientists for 2021-2026, receiving the Carleton University Research Achievement Award (2007-2008) and the ASME OMAE 2020 Conference Appreciation Award, and serving as a guest editor for Metals, an associate editor for Frontiers in Materials (Mechanics of Materials section), and an editorial board member for Advances in Bridge Engineering.

讲座内容：

Under high-temperature adverse environments, the premature failure of air plasma spray thermal barrier coatings (APS-TBCs) is a phenomenon that can significantly limit the application of TBCs in gas turbine engines. The delamination failure of TBCs typically occurs at the interfaces between the topcoat and bond coat due to thermal mismatch stress and thermal gradient, resulting in crack propagation and final spallation failure of the coating. This seminar will discuss our recent work on the delamination of TBCs using multi-physics methodologies. Heat transfer was cyclically implemented into the TBC model, resulting in a thermal gradient, to simulate the in-service operation of the TBC system. A variational-based sintering model for a topcoat of TBCs is incorporated into the simulation. The high-temperature creep model of the topcoat, thermal growth oxide (TGO) and bond coat is included. The stress field across the TBCs was calculated during the thermal cycles, with the location of high-stress concentration selected as the potential crack initiation site. Phase field damage modelling was conducted to study crack propagation, initially located at the high tensile stress off-peak interface. Results indicate that at the off-peak interface, the crack propagates rapidly in the top right direction during the first few cycles, then stops propagating as the TGO thickens. This study demonstrates the feasibility of using the phase field damage model to predict crack growth in TBC during the thermal cycles, based on which a life estimation framework can established.