Publication detail
Analysis of Multiple Cracks in Thin Coating on Orthotropic Substrate
KOTOUL, M. PROFANT, T. ŠEVEČEK, O.
Czech title
Analysis of Multiple Cracks in Thin Coating on Orthotropic Substrate
English title
Analysis of Multiple Cracks in Thin Coating on Orthotropic Substrate
Type
conference paper
Language
en
Original abstract
The analysis addresses a typical failure development pattern consisting of a system of multiple surface cracks leading to and branching along or near the interface between the coating and the base material. The process is driven by thermal stresses. Due to the high temperature gradients during the fabrication process, usually a net of surface cracks develops, which gives the appearance of a granular structure of the surface. A periodic array of parallel surface cracks is assumed. A ''unit cell'' or single cracked segment attached to the substrate is analyzed instead by assuming the channel cracks are spaced more or less uniformly and perfectly aligned in parallel in the transverse direction of the coating. The problem is solved using both FEM combined with the reciprocal theorem and the technique of distributed dislocations. Existing semi-analytical solution for singularities in anisotropic trimaterials is applied.
Czech abstract
The analysis addresses a typical failure development pattern consisting of a system of multiple surface cracks leading to and branching along or near the interface between the coating and the base material. The process is driven by thermal stresses. Due to the high temperature gradients during the fabrication process, usually a net of surface cracks develops, which gives the appearance of a granular structure of the surface. A periodic array of parallel surface cracks is assumed. A ''unit cell'' or single cracked segment attached to the substrate is analyzed instead by assuming the channel cracks are spaced more or less uniformly and perfectly aligned in parallel in the transverse direction of the coating. The problem is solved using both FEM combined with the reciprocal theorem and the technique of distributed dislocations. Existing semi-analytical solution for singularities in anisotropic trimaterials is applied.
English abstract
The analysis addresses a typical failure development pattern consisting of a system of multiple surface cracks leading to and branching along or near the interface between the coating and the base material. The process is driven by thermal stresses. Due to the high temperature gradients during the fabrication process, usually a net of surface cracks develops, which gives the appearance of a granular structure of the surface. A periodic array of parallel surface cracks is assumed. A ''unit cell'' or single cracked segment attached to the substrate is analyzed instead by assuming the channel cracks are spaced more or less uniformly and perfectly aligned in parallel in the transverse direction of the coating. The problem is solved using both FEM combined with the reciprocal theorem and the technique of distributed dislocations. Existing semi-analytical solution for singularities in anisotropic trimaterials is applied.
Keywords in Czech
Multiple cracks, coating, interface, thermal stresses, distribution of dislocations, reciprocal theorem
Keywords in English
Multiple cracks, coating, interface, thermal stresses, distribution of dislocations, reciprocal theorem
RIV year
2008
Released
30.08.2008
Publisher
VUTIUM Brno
Location
Czech Republic
ISBN
9781617823190
Book
Multilevel Approach to Fracture of Materials, Components and Structures
Edition number
1
Pages from–to
170–177
Pages count
8
BIBTEX
@inproceedings{BUT26747,
author="Michal {Kotoul} and Tomáš {Profant} and Oldřich {Ševeček},
title="Analysis of Multiple Cracks in Thin Coating on Orthotropic Substrate",
booktitle="Multilevel Approach to Fracture of Materials, Components and Structures",
year="2008",
month="August",
pages="170--177",
publisher="VUTIUM Brno",
address="Czech Republic",
isbn="9781617823190"
}