Mechanical and thermomechanical mesoscale analysis of multiple surface cracks in ceramic coatings based on the DEM-FEM coupling method

The present paper aims to use the concurrent coupling approach of Finite Element Method (FEM) and Discrete Element Method (DEM) to simulate the surface cracking and the local damage in ceramic coating-substrate structures due to mechanical and thermomechanical loading. DEM is an efficient approach f...

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Bibliographic Details
Published in:International journal of solids and structures 2022-02, Vol.236-237, p.111336, Article 111336
Main Authors: Ghasemi, M.A., Falahatgar, S.R., Mostofi, T.M.
Format: Article
Language:English
Subjects:
Bridging domain method
Ceramic coatings
Ceramic glazes
Ceramics
Coating effects
Coupling
Crack initiation
Cracking (fracturing)
Damage
DEM-FEM coupling method
Discrete element method
Finite element method
Fracture mechanics
Interfacial delamination
Mesoscale phenomena
Multiple surface cracks
Protective coatings
Substrates
Surface cracks
Thermomechanical analysis
Thermomechanical loading
Timoshenko beams
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Summary:The present paper aims to use the concurrent coupling approach of Finite Element Method (FEM) and Discrete Element Method (DEM) to simulate the surface cracking and the local damage in ceramic coating-substrate structures due to mechanical and thermomechanical loading. DEM is an efficient approach for studying the brittle fracture phenomenon at the micro and mesoscale. There are limitations in the use of this method at the macro-scale due to the number of elements. DEM-FEM coupling methods, which take the benefits of both continuous and discrete approaches can be used to reduce the computational effort. In this paper, the bridging domain method which is based on domain decomposition with the overlapping area has been used as the coupling approach. At the mesoscale level, particles with random arrangements were used to discretize the domain. They are bonded with their neighbors using the Timoshenko beam elements. The solver code has been provided by the authors and verified firstly by comparison with the mechanism of surface cracking in ceramic coating obtained from FEM simulation results. Then, the effect of coating thickness, surface crack density, and temperature rise has been investigated on the cracking and interfacial debonding of the ceramic coating. The results demonstrate the importance of temperature changes on the mechanism of damage initiation and evolution in ceramic coating-substrate structures in comparison with pure mechanical loading state.
ISSN:0020-7683
1879-2146
DOI:10.1016/j.ijsolstr.2021.111336