TBC FAILURE · Numerical modelling of failure development within TBC systems
6РП — Действия „Мария Кюри“
- Период
- 2006-08-01 → 2007-07-31
- Финансиране от ЕС
- 40 000 €
- Участници
- 1
- Схема
- ERG
Линиите свързват координатора с партньорите. За проекти отпреди 2014 г. CORDIS не винаги дава точни координати. Тези точки са на ниво град или държава.
Накратко на български
Термобариерните покрития в газовите турбини се анализират чрез математически модели, за да се проследи как се появяват пукнатини в слоевете им. Това помага за по-точно предвиждане на издръжливостта на материалите и подобряване на техните свойства.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
Final Activity Report Summary - TBC FAILURE (Numerical modelling of failure development within TBC systems)
During the last decade, there has been an enormous effort to introduce single crystal (SC) and thermal barrier coating (TBC) technologies for the manufacture of high temperature components for advanced power generation gas turbines. The main objective of the project was a realistic FEM modelling of all TBC system constituents including the creep response of the Ni-based super alloy CMSX-4. The current research took into account a broad spectrum of materials features, including time dependent behaviour of CMSX-4, the creep of APS TBC, bond coat (BC) and of the thermally grown oxide (TGO). The oxidation process was taken into account by a volumetric swelling of the TGO layer. In order to simulate crack development, cohesive zone elements were placed at the interface between the TGO and BC. Having achieved that, a numerical tool for a mapping of a broader damage scenarios related to realistic loading profiles in gas turbines has been created. The scientific / technological result of the project is an enhanced, physically based life prediction concept for TBCs, which enables to predict the durability or service life of TBCs under realistic loading programs, so that the material potential of ceramic thermal barrier coatings can be used to a higher extent. Furthermore, knowledge of the quantitative effect of material parameters on the durability of TBCs will enable an improvement of material properties of its constituents. In order to get an insight into the delamination and spallation of TBC, a mathematical model of a thin film delaminating from a substrate was created. A two dimensional plane stress problem of an elastic film bonded to the rigid substrate and loaded by a concentrated in-plane force was considered. An analytical solution has been obtained for a specific value of Poisson's ratio assuming the rigid-friction interaction between the film and the substrate. This serves as a basis for a better understanding of the delamination process. It was possible to determine the boundary between the damaged and bonded zones at the interface, shear stress distribution at the interface and the stresses within the thin film.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
The scientific objective of the project is a development of new methods for a prediction of service life times of a single crystal Ni-based super-alloy used in the design of heavy industrial gas turbines. Under operation conditions turbine blades experience complex loading, combined with the existence of residual stresses and oxidation processes. The improvements in increasing the efficiency of gas turbines have been partially achieved by applying thermal barrier coatings (TBCs) on turbine blades. However, the mechanisms leading to failure and the parameters limiting coating lifetime have not been fully revealed so far. Finite element simulations of failure development within TBCs will be performed. They are aimed to be a continuation of works performed by Dr Bialas during his Marie Curie Intra-Fellowship in the Research Centre Juelich (FZJ).In this context the project's goal is also to further promote an on-going co-operation between FZJ and the Institute of Fundamental Technological Research (IFTR), Warsa w, dr Bialas' mother institution in Poland. The project will enable an interdisciplinary co-operation between theoretically oriented structural mechanics and the experimentally oriented materials science at FZJ and thus, contribute to an increase of scientific excellence in Europe. It will also help to create a group of researchers at IFTR working with thin films technologies and to adapt the methods learned by Dr Bialas during his fellowship to other engineering topics, which are generally connected to interfacial damage problems. Mechanical modelling of constituents of TBC systems will be performed with the main goal of a further development of the TBC failure model based on the cohesive zone concept. Anisotropic and time dependent mechanical response of C MSX-4 Ni-based super-alloy and its influence on stress distribution within TBC will be a major scientific objective. The technology of cooling holes will be also addressed.
Оригинален текст от CORDIS (на английски).
Участници
- THE INSTITUTE OF FUNDAMENTAL TECHNOLOGICAL RESEARCH, POLISCH ACADEMY OF SCIENCES · WARSAWКоординаторНиво градПолша
Връзки
Данни: CORDIS, © Европейски съюз