Multi-objective Global Optimization for Deformation Near a Hole in an Oxide Forming Alloy Foil Subjected to Thermal Cycling

• Published in: International Journal of Precision Engineering and Manufacturing-Green Technology, 5(2) Vol. 5; no. 2; pp. 261 - 269
• Main Authors: Li, Feng-Xun, Li, Zhen-Zhe
• Format: Journal Article
• Language: English
• Published: Seoul Korean Society for Precision Engineering 01.04.2018; Springer Nature B.V; 한국정밀공학회
• Subjects: Deformation; Durability; Energy Efficiency; Engineering; Foils; Gas turbine engines; Gas turbines; Global optimization; High temperature; Industrial and Production Engineering; Mathematical analysis; Multiple objective analysis; Optimization; Plastic buckling; Plastic deformation; Regular Paper; Residual stress; Response surface methodology; Substrates; Superalloys; Sustainable Development; Thermal barrier coatings; Thermal cycling; Thermal expansion; 기계공학; Thermally grown oxide; Gas turbine; Hot corrosion; Optimal design; Thermal barrier coating
• ISSN: 2288-6206; 2198-0810
• DOI: 10.1007/s40684-018-0027-4

The TBC (thermal barrier coating) systems provide protection against high temperature corrosion of the superalloy substrates in the gas turbine engines. However, the lateral growth of TGO (thermally-grown oxide) and the thermal expansion misfit between TGO and BC(bond coat) induce internal stress which can be sufficient to activate plastic deformation or buckling in TGO. In this paper, the analytic and optimization methods were applied for improving durability of the TBC system. First, an analytic method for obtaining the deformation results of TBC system was applied. In the following step, the analysis results were obtained for the experimental points selected by the D-optimal DOE method. Based on these analysis data, the fitting functions for showing the deformation of the TBC system were constructed using the response surface method. Finally, a multi-objective global optimization method was developed for upgrading durability of the TBC system. The developed analytic and optimization methods can be widely used to improve the performance of the TBC system for the gas turbine engines.