Modeling and simulation of coupled phase transformation and stress evolution in thermal barrier coatings

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2020

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Pergamon-elsevier Science Ltd

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Mechanical Engineering
(2009)
The Atılım University Department of Mechanical Engineering started education in 2009, and offers graduate and doctorate degree programs, in addition to its undergraduate program. Our main goal is to graduate Mechanical Engineers who have the skills to design, analyze and synthesize; who are able to convert advanced technology and innovations into products; and who have the culture of research and cooperation. While our graduates reach this goal, they adopt the principle of life-long learning, and develop a sense of entrepreneurship, paying importance to professional ethics. With a curriculum prepared in line with the criteria of MÜDEK, we help our students develop themselves professionally, and socially. Graduates of mechanical engineering may be employed in many sectors and in a wide array of positions. Able to work under any field that involves production and energy conversion, graduates of the department may also gain expertise in fields such as aviation, automotive, or material engineering.
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Aerospace Engineering
(2020)
Turkey has made a significant progress in terms of aerospace and defense industries. The Atılım University Department of Aerospace Engineering opens to students in the Academic Year of 2020-2021, with the aim to train qualified engineers as required in the ever-developing aerospace industry. This department is a field of engineering that focuses on the R&D, design, manufacturing, testing and performance processes of aircraft such as planes, choppers, or rockets; as well as satellites, and other kinds of spacecraft. Located in Ankara where much of the work related to the aerospace studies takes place, our School is to offer common projects and long-term opportunities for internship studies with many companies in the industry. Our academic staff involves faculty members who are experienced in teaching aerospace engineering, as well as experts in the field after having worked in many projects in the defense industry, in addition to offering consulting. Backed with our state-of-the-art laboratories, our curriculum is to offer students a chance to acquire the skills and know-hows to advance Turkey in the sector. We aim to implement a hands-on approach in education by training our students with our aircraft in our hangar at Esenboğa Airport. We aim to provide them with a practical training, and a constant opportunity to touch, feel, and experience the aircraft, from the first year. Our focus is to have students experience the process of R&D, from the designing stage to prototype manufacturing. Our course content, devised to match the current needs of the sector, shall make it possible for our students to find employment in their fields of competence and interest.

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Abstract

The thermally grown oxide layer is known to be responsible for the failure of coating systems due to the generation of severely high stresses. In this work, oxidation induced stresses generated in thermal barrier coating (TBC) systems are investigated for high temperature isothermal oxidation. In that sense, a comprehensive model, where phase transformation is coupled with mechanics is developed for the life-time estimation of TBC systems and a modified version of the Allen-Cahn type phase field approach is adopted in order to model the generation of thermally grown oxide (TGO) in finite strain constitutive framework. The top-coat material behavior is modeled using a rate-dependent Gurson type plasticity for porous materials which also accounts for creep. The results for the isothermal phase transformation analysis and the model validation using experimental results are demonstrated. The capability of the model in predicting the local stresses which is the main variable in the analysis of possible delaminations and accurate lifetime estimation of TBC systems is shown.

Description

sait, ferit/0000-0003-2279-8183; aslan, ozgur/0000-0002-1042-0805; Gurses, Ercan/0000-0001-6030-4063

Keywords

Thermal barrier coating, Oxidation, Phase field, FEM, Finite strain plasticity, Coupled analysis, Phase interface

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Citation

14

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Volume

134

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URI

https://doi.org/10.1016/j.ijplas.2020.102790
 https://hdl.handle.net/20.500.14411/3161

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