Modelling of self-healing thermal barrier coatings Background Thermal Barrier Coating (TBC) systems are applied in gas turbine engines used for propulsion.

Slides:



Advertisements
Similar presentations
Numerical Example - Contact Study A two layered [0 0 /90 0 ] laminate with a pre-existing delamination at the ply interface is considered. The plate is.
Advertisements

Design and analysis of conformal composite LH2 fuel tanks for hypersonic aircrafts Background The need for more detailed investigations on liquid hydrogen.
Knowledge Based Engineering to Support Automotive Electric and Electronic System Design and Automatic Control Software Development Background Based on.
Elektronový mikroskop SEM In our miniproject “Fracture: Initiation, Propagation, Consequences and Modeling” the tensile test, computer simulations, observation.
Micro-Scale Experiments and Models for Composite Materials PhD project duration: 1. January December 2014 Project type & funding: PhD-A project,
An Experimental Study and Fatigue Damage Model for Fretting Fatigue
Finite Element Simulation of Woven Fabric Composites B.H. Le Page *, F.J. Guild +, S.L. Ogin * and P.A. Smith * * School of Engineering, University of.
Multiple-site Damage in Fiber Metal Laminates (Title: Bookman old style 66pt) Introduction Fibre Metal Laminates(FMLs) are a class of hybrid materials,
A study of failure criteria of variable stiffness composite panels Fiber reinforced composites has been widely used in the field of Aeronautics, Astronautics.
Resistance welding of thermoplastic composites Background Thermosetting and thermoplastic polymers are two kinds of matrix for fibre reinforced polymer.
Results Several two- and three-dimensional isogeometric shape optimization examples, all of which are non- self adjoint problems, are presented in figure3,
Mixed-Mode Fatigue Disbond on Metal-to-Metal Interfaces Motivation Adhesive bonding provides a promising alternative to riveted connections, providing.
Damage tolerance of adhesively bonded structures Background Adhesive bonding promises to allow the design of lighter weight structures. Before adhesive.
2009 ASME Wind Energy Symposium Static and Fatigue Testing of Thick Adhesive Joints for Wind Turbine Blades Daniel Samborsky, Aaron Sears, John Mandell,
Japan-US Workshop held at San Diego on April 6-7, 2002 How can we keep structural integrity of the first wall having micro cracks? R. Kurihara JAERI-Naka.
Engineering Mechanics Group Faculty of Aerospace Engineering Minor Programme 2 Aerospace Analysis and Development.
Physical and Mechanical Characteristics of Pb-free Solder - Copper Joints Project funded by OFES (Switzerland) Within the framework of :Cost Action 531:
In-Situ Observation of Crack Behavior in Plasma-Sprayed 7 wt% Yttria-Stabilized Zirconia Jonathan Levin Purdue University Advisor: Prof. Trice.
CH3 MICROMECHANICS Assist.Prof.Dr. Ahmet Erklig. Ultimate Strengths of a Unidirectional Lamina.
Mechanical characterization of lead- free solder joints J. Cugnoni*, A. Mellal*, Th. J. Pr. J. Botsis* * LMAF / EPFL EMPA Switzerland.
1 MODELING DT VAPORIZATION AND MELTING IN A DIRECT DRIVE TARGET B. R. Christensen, A. R. Raffray, and M. S. Tillack Mechanical and Aerospace Engineering.
Subgrade Models for Rigid Pavements. Development of theories for analyzing rigid pavements include the choice of a subgrade model. When the chosen model.
Vibrational power flow analysis of nonlinear dynamic systems and applications Jian Yang. Supervisors: Dr. Ye Ping Xiong and Prof. Jing Tang Xing Faculty.
© 2011 Autodesk Freely licensed for use by educational institutions. Reuse and changes require a note indicating that content has been modified from the.
November 14, 2013 Mechanical Engineering Tribology Laboratory (METL) Sina Mobasher Moghaddam Ph.D. Research Assistant Effect of Mean Stress on Rolling.
Foam Reinforced Aircraft Fuselage Study Narasimha Harindra Vedala, Tarek Lazghab, Amit Datye, K.H. Wu Mechanical And Materials Engineering Department Florida.
Buckling Delamination with Application to Films and Laminates
Optimization of the sensor network use Current situation On a wind turbine (WT), hundreds of sensors are found at different location and used for control.
Uncertainties in Thermal Barrier Coating Life Prediction by Karl A. Mentz A Thesis Submitted to the Graduate Faculty of Rensselaer Polytechnic Institute.
2.1.4 High Fidelity Design Tool Development Probabilistic Part Life Methods/Material Requirements Definition Science & Technology Objective(s):
Miguel Patrício CMUC Polytechnic Institute of Leiria School of Technology and Management.
Anisotropy of Commercially Pure Titanium (CP-Ti) Experimental Setup and Procedures Experimental Results Results and Conclusions Project Objective: To assess.
Engineering Doctorate – Nuclear Materials Development of Advanced Defect Assessment Methods Involving Weld Residual Stresses If using an image in the.
ME 520 Fundamentals of Finite Element Analysis
Ramesh Talreja Aerospace Engineering Texas A&M University, College Station, Texas.
Crack propagation on highly heterogeneous composite materials Miguel Patrício.
FAILURE INVESTIGATION OF UNDERGROUND DISTANT HEATING PIPELINE
T.M.F.T: Thermal Mechanical Fatigue Testing
Lecture # 6 Failure Intended learning Outcomes: 1.Describe the mechanism of crack propagation for both ductile and brittle modes of fracture. 2. Explain.
Department of Civil and Environmental Engineering, The University of Melbourne Finite Element Modelling Applications (Notes prepared by A. Hira – modified.
© Effect Of Platinum On The Oxide-To-Metal Adhesion In Thermal Barrier Coating Systems Tawancy, HM; Ui-Hamid, A; Abbas, NM; Aboelfotoh, MO SPRINGER, JOURNAL.
DISLOCATION DYNAMICS STUDIES OF DISLOCATION INTERACTION IN MULTILAYERS UROP 03 – STAGE II PRESENTATION by Rajlakshmi Purkayastha ( ) under the.
November 14, 2013 Mechanical Engineering Tribology Laboratory (METL) Arnab Ghosh Ph.D. Research Assistant Analytical Modeling of Surface and Subsurface.
Thermal Degradation of Polymeric Foam Cored Sandwich Structures S.Zhang 1, J.M.Dulieu-Barton 1, R.K.Fruehmann 1, and O.T.Thomsen 2 1 Faculty of Engineering.
Mumm Lab Advanced Materials and Structures Laboratory
National Science Foundation Mechanical Forces That Change Chemistry Brian W. Sheldon, Brown University, DMR Outcome: Research at Brown University.
Far Shore Wind Climate Modelling Background Far shore wind conditions are expected to be favorable for wind energy power production due to increased mean.
HEAT TRANSFER FINITE ELEMENT FORMULATION
The tungsten/F82H sample was impinged at 6 different locations with 6 different laser fluence energies to determine the critical energy that would result.
Byron Williams – BAE Systems
EBC’s for Energy Efficient Heat Engines. DOE/Energy Efficient Science Program under Cooperative Agreement DE-FC20-01CH11086-A000 Presented at EBC’s for.
Date of download: 5/29/2016 Copyright © ASME. All rights reserved. From: Quantification of Foreign Object Damage and Electrical Resistivity for Ceramic.
Thermal Spray Coatings Asst.Prof.Dr. Ali Sabea Hammood Materials Engineering Department Materials Engineering Department Faculty of Engineering Faculty.
GOAL: To understand the physics of active region decay, and the Quiet Sun network APPROACH: Use physics-based numerical models to simulate the dynamic.
Improving Dimensional Stability of Microelectronic Substrates by Tuning of Electric Artworks Parsaoran Hutapea Composites Laboratory Department of Mechanical.
CRACK GROWTH IN NOTCHED SPECIMEN UNDER REPETITIVE IMPACTS Presented By: Gayan Abeygunawardane-Arachchige Gayan Abeygunawardane-Arachchige Prof. Vadim Silberschmidt.
Date of download: 6/22/2016 Copyright © ASME. All rights reserved. From: The Importance of Intrinsic Damage Properties to Bone Fragility: A Finite Element.
Željko V. Despotović, Miloš.D. Jovanović Mihajlo Pupin Institute, University of Belgrade, Serbia
Institute of Mechanics and Advanced Materials An Adaptive Multiscale Method for Modelling of Fracture in Polycrystalline Materials Ahmad Akbari R., Pierre.
Finite Element Modeling of Nacre
Computational Prediction of Mechanical Performance of Particulate-Reinforced Al Metal-Matrix Composites (MMCs) using a XFEM Approach Emily A. Gerstein.
Date of download: 10/19/2017 Copyright © ASME. All rights reserved.
M. Z. Bezas, Th. N. Nikolaidis, C. C. Baniotopoulos
ENT 487 FRACTURE MECHANISMS IN METALS
Date of download: 10/23/2017 Copyright © ASME. All rights reserved.
From: Evolution Mechanisms of Thermal Shock Cracks in Ceramic Sheet
On calibration of micro-crack model of thermally induced cracks through inverse analysis Dr Vladimir Buljak University of Belgrade, Faculty of Mechanical.
Date of download: 1/6/2018 Copyright © ASME. All rights reserved.
Volume 103, Issue 9, Pages (November 2012)
Materials: engineering, science, processing and design, 2nd edition Copyright (c)2010 Michael Ashby, Hugh Shercliff, David Cebon.
Presentation transcript:

Modelling of self-healing thermal barrier coatings Background Thermal Barrier Coating (TBC) systems are applied in gas turbine engines used for propulsion and power generation to increase their thermodynamic efficiency and to protect critical structural components. Thermal cycling, shown in Fig.1, causes high stresses in the TBC system due to a mismatch between the coefficients of thermal expansion of the substrate and the different layers in the coating system [1]. These stresses induce cracks that ultimately lead to failure of the system [2]. Due to the damage in TBC system, engines need to be repaired several times during their lifetime, leading to significant maintenance costs. References 1.W.G. Sloof, (2007) “Self Healing in Coatings at High Temperatures in: Self Healing Materials an Alternative Approach to 20 Centuries of Materials Science”, S. van der Zwaag, Springer, Dordrecht, The Netherlands, pp T.S. Hille, T.J. Nijdam, A.S.J. Suiker, S. Turteltaub, W.G. Sloof, (2009) “Damage growth triggered by interface irregularities in thermal barrier coatings”, Acta Materialia, 57, Sathiskumar. A. Ponnusami, (2013) ”Self-healing thermal barrier coatings”, Leonardo Times, Journal of the Society of Aerospace Engineering Students ‘Leonardo da Vinci’, 17 (1), Z. Derelioglu, Sathiskumar. A. Ponnusami, S. Turteltaub, S. van der Zwaag and W.G. Sloof, (2013) “Healing Particles in Self-Healing Thermal Barrier Coatings”, Fourth International Conference on Self healing Materials ICSHM2013, Ghent, Belgium. Fig.1: Typical thermal cycle of a gas turbine engine Objective The goal of this project is to extend the TBC system lifetime by incorporating a self-healing mechanism in the system. The proposed mechanism relies on encapsulated healing particles dispersed in the Top Coat (TC) layer [3, 4]. In the self-healing TBC system, cracks occurring in the TC layer during the cooling process will be healed in the next cycle, as shown in Fig.2. The development of this novel TBC system will be achieved through numerical modelling combined with experimental work. Fig.4: Typical crack pattern in TC/TGO interface of an RVE (a) near the edge of specimen, (b) in the interior of specimen Approach The main modelling steps include Simulation of fracture response on Representative Volume Elements (RVEs) under thermomechanical loading of a TBC system Coupling of a TGO growth model to the thermomechanical FEM simulations Study of crack- healing particle interaction in TBC Incorporation of a reaction-diffusion model to simulate the healing process The fracture behaviour will be modelled using a cohesive law that also accounts for healing. Parametric studies of different morphologies will be carried out to identify an optimal configuration for the self-healing TBC system. PhD Candidate: Sathiskumar A Ponnusami Department: ASM Section: ASCM Supervisor: Dr. Sergio Turteltaub Start date: Funding: IOP Self healing materials Cooperations: NLR, KLM, Sulzer Turboservices Aerospace Engineering Fig.2: Schematic of crack-healing mechanism in a TBC system with encapsulated Mo-Si based particles. The TBC system comprises a nickel based superalloy substrate with a MCrAlY bond coating (BC) and the modified yttria stabilized zirconia top coat (TC). During service, a thermally grown oxide (TGO) appears between the TC and BC layers. Progress and Challenges As a subsequent step in the design process, a three- dimensional finite element model of a TBC with healing particles has been developed in order to simulate the interaction between cracks in the TBC and an array of embedded healing particles. Based on the geometry and material properties of healing particles and the surrounding matrix (TC), the crack initiated under thermal cycling may penetrate into the particle or deflect away from the particle. This information can be used to determine the optimal configuration of the healing particles to properly activate the healing mechanism during service. Results The FEA results corresponding to RVEs near the edge and the middle of the macroscopic specimen coated with a TBC are shown in Fig.4. Red color indicates the regions that are cracked, whereas the blue colored portions are intact. For points near the edge of the macroscopic specimen, delamination cracks initiate at the free edge as may be observed in Fig.4a. On the other hand, for the RVE in the interior of the macroscopic specimen, cracks initiate at valleys of the TC/TGO interface as shown in Fig.4b. This study will help to identify the critical regions where the healing particles can be embedded. Fig.3: Finite element model of TBC system (a) coated substrate (macroscale), (b) volume element in TBC (microscale) The microscopic RVE consists of three layers of the TBC system representing BC, TGO and TC. In this study, the interfaces between the layers (TC/TGO and TGO/BC) are modeled as a double-sinusoidal surface. Interface irregularities are known to be one of the key drivers for crack initiation in this inhomogeneous system [2] since they allow large in-plane compressive stresses (generated during cooling) to eventually produce out- of-plane tensile stresses. Cohesive elements at the microscale are used to simulate fracture in the TBC. Both macro and micro specimens are subjected to the same thermal load consisting of a temperature change of 1000 °C. (a)(b) (a)(b) Finite Element Analysis Knowledge of the damage mechanisms in TBCs is essential in order to design a particle-based healing system. In particular, it is important to embed healing particles in regions where cracks are likely to initiate. Furthermore, the size and number of healing particles in these critical regions must be optimized with the purpose of developing an efficient and robust self- healing system. In order to understand the failure mechanisms under thermal loading, three-dimensional finite element analyses (FEA) have been carried out on macroscopic specimen and microscopic RVEs of a TBC. The effect of the substrate on the microscopic RVE is taken into account through macroscopic displacements imposed as boundary conditions at the microscale. These displacements are obtained from the macroscopic analysis, where a finite element model of a macroscopic specimen is employed with two layers, one representing the homogenized TBC and the other representing the substrate as shown in Fig.3a. The microscopic finite element model of the TBC system is shown in Fig.3b.