Tensile cracking of a brittle conformal coating on a rough substrate
Abstract
This note examines the effect of interfacial roughness on the initiation and growth of channel cracks in a brittle film. A conformal film with cusp-like surface flaws that replicate the substrate roughness is investigated. This type of surface flaw is relatively severe in the sense that stress diverges as the cusp-tip is approached (i.e., there is a power-law stress singularity). For the geometry and range of film properties considered, the analysis suggests that smoothing the substrate could substantially increase the film’s resistance to the formation of the through-the-thickness cracks that precede channel cracking. Furthermore, smoothing the substrate’s surface has a relatively modest effect on the film stress needed to propagate a channel crack.
- Authors:
-
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1249091
- Report Number(s):
- SAND-2016-1745J
Journal ID: ISSN 0376-9429; PII: 109
- Grant/Contract Number:
- AC04-94AL85000
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- International Journal of Fracture
- Additional Journal Information:
- Journal Volume: 1; Journal Issue: 3; Journal ID: ISSN 0376-9429
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; thin film; roughness; fracture; cracking
Citation Formats
Reedy, Jr., E. D. Tensile cracking of a brittle conformal coating on a rough substrate. United States: N. p., 2016.
Web. doi:10.1007/s10704-016-0109-7.
Reedy, Jr., E. D. Tensile cracking of a brittle conformal coating on a rough substrate. United States. https://doi.org/10.1007/s10704-016-0109-7
Reedy, Jr., E. D. 2016.
"Tensile cracking of a brittle conformal coating on a rough substrate". United States. https://doi.org/10.1007/s10704-016-0109-7. https://www.osti.gov/servlets/purl/1249091.
@article{osti_1249091,
title = {Tensile cracking of a brittle conformal coating on a rough substrate},
author = {Reedy, Jr., E. D.},
abstractNote = {This note examines the effect of interfacial roughness on the initiation and growth of channel cracks in a brittle film. A conformal film with cusp-like surface flaws that replicate the substrate roughness is investigated. This type of surface flaw is relatively severe in the sense that stress diverges as the cusp-tip is approached (i.e., there is a power-law stress singularity). For the geometry and range of film properties considered, the analysis suggests that smoothing the substrate could substantially increase the film’s resistance to the formation of the through-the-thickness cracks that precede channel cracking. Furthermore, smoothing the substrate’s surface has a relatively modest effect on the film stress needed to propagate a channel crack.},
doi = {10.1007/s10704-016-0109-7},
url = {https://www.osti.gov/biblio/1249091},
journal = {International Journal of Fracture},
issn = {0376-9429},
number = 3,
volume = 1,
place = {United States},
year = {Thu Apr 07 00:00:00 EDT 2016},
month = {Thu Apr 07 00:00:00 EDT 2016}
}
Web of Science
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