Finite Element Modelling of TBC Failure Mechanisms by Using XFEM and CZM

Download

1-s2.0-S2452321619305645-main.pdf

Date

2019-01-01

Author

Bostanci, Safa Mesut
Gürses, Ercan
Çöker, Demirkan

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

203
views

120
downloads

Thermal Barrier Coatings have been widely used in modern turbine engines to protect the nickel based metal substrate from the high temperature service conditions, 1600-1800 K. In this study, failure mechanisms of typical Air Plasma Sprayed Thermal Barrier Coatings (TBC) used in after-burner structures composed of three major layers: Inconel 718 substrate, NiCrAlY based metallic bond coat (BC) and Yttria Stabilized Zirconia (YSZ) based ceramic top coat (TC) are investigated. Investigation of the cracking mechanism of TBC in terms of design and performance is very important because the behavior of TBCs on ductile metallic substrates is brittle. To this end, four-point bending experiments reported in Kukoglu (2015) are analyzed by using the Extended Finite Element Method (XFEM) and the Cohesive Zone Method (CZM). All the analyses are conducted with the commercial finite element software ABAQUS. Three different models with varying TC and BC thicknesses are studied. It is observed that multiple vertical cracks are initiated in the TC. Cracks initiate at the top of YSZ and propagate through the whole TC until they reach the interface between the TC and the BC. Then, delaminations at the interface between the TC and the BC start. It is observed that the average spacing of cracks in TC increases with the increasing thickness of the TC and the delamination becomes prominent with the increasing TC thickness. Numerical results are found to be consistent with the experimental results. (c) 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review line: Peer-review under responsibility of the 1st International Workshop on Plasticity, Damage and Fracture of Engineering Materials organizers.

Subject Keywords

EXtended Finite Element Method, Cohesive Zone Method, Thermal Barrier Coatings

URI

https://hdl.handle.net/11511/44851

DOI

https://doi.org/10.1016/j.prostr.2019.12.090

Collections

Department of Aerospace Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Finite element modelling of tbc failure mechanisms by using extended finite element method and cohesive zone method Bostancı, Safa Mesut.; Gürses, Ercan; Department of Aerospace Engineering (2019) Thermal Barrier Coatings have been widely used in modern turbine engines to protect the nickel based metal substrate from the high temperature service conditions, 1600-1800 K. In this study, failure mechanisms of typical Air Plasma Sprayed Thermal Barrier Coatings (TBC) used in after-burner structures composed of three major layers: Inconel 718 substrate, NiCrAlY based metallic bond coat (BC) and Yttria Stabilized Zirconia (YSZ) based ceramic top coat (TC) are investigated. Investigation of the cracking mec...
Finite element modelling of TBC failure mechanisms by using XFEM Bostancı, Safa Mesut; Gürses, Ercan; Çöker, Demirkan (2018-01-01) Thermal Barrier Coatings have been widely used in modern turbine engines to protect the nickel based metal substrate from the high temperature service conditions, 1600-1800 K. In this study, some of the failure mechanisms of typical Air Plasma Sprayed Thermal Barrier Coatings (TBC) used in after-burner structures composed of three major layers: Inconel 718 substrate, NiCrAlY based metallic bond coat (BC) and Yttria Stabilized Zirconia (YSZ) based ceramic top coat (TC) are investigated. Investigation of the ...
Finite element modeling of micro particle separation using ultrasonic standing waves Süleyman, Büyükkoçak; Çetin, Barbaros; Özer, Mehmet Bülent (2014-08-07) Acoustophoresis which means separation of particles and cells using acoustic waves is becoming an intensive research subject. The method is based on inducing an ultrasonic compression standing wave inside a microchannel. A finite element approach is used to model the acoustic and electro-mechanical behavior of the piezoelectric material, the micro-channel geometry as well as the fluid inside the channel. The choices of silicon and PDMS materials are investigated as the chip materials for the resonator. A se...
FINITE ELEMENT ANALYSIS OF NANOINDENTATION ON NANOLAMINATED MATERIALS Özerinç, Sezer (2018-12-01) Nanoindentation is a widely used tool for probing the mechanical properties of materials at the nanoscale. The analysis of the load-displacement curve obtained from nanoindentation provides the hardness and elastic modulus of the material. While hardness is a useful parameter for comparing different alloys and understanding tribological behavior, yield strength is a more useful parameter for alloy design and application in general. The yield strength of a nanoindentation-tested material can be estimated by ...
Finite element analysis of shearing processes Isbir, S.; Darendeliler, Haluk; Gökler, Mustafa İlhan (null; 2006-12-01) Shearing of sheet metal is extensively used in manufacturing industry. It is a highly non-linear process and involves complex mechanisms such as crack initiation and propagation, and deliberate fracture of the material for obtaining the desired geometry. Finite element method can be used for the design of shearing process. However, most of the general purpose commercial finite element analysis programs do not provide ready-to-use facilities to simulate shearing. In this paper, finite element simulation of s...

Citation Formats

S. M. Bostanci, E. Gürses, and D. Çöker, “Finite Element Modelling of TBC Failure Mechanisms by Using XFEM and CZM,” 2019, vol. 21, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/44851.