An elasto-plastic solution for channel cracking of brittle coating on polymer substrate
Abstract
In this study, an elasto-plastic channel-cracking model is presented to study the open-mode fracture of a thin layer brittle coating grown on a polymer substrate. A linear elastic shear interlayer is introduced to describe the stress transfer from the elasto-plastic substrate to the brittle coating, on basis of the shear-lag principle. The channel cracking behavior involves three stages: elastic, elasto-plastic and plastic stages, which are solved in a continuous manner based on the deformation status of the substrate. Explicit solutions are derived for the mutli-stage cracking process. Corresponding experimental tests for a titanium oxide (TiO2) coating on a poly (ethylene terephthalate) substrate are conducted. The fracture toughness of the coating layer is estimated based on the crack spacing versus layer thickness relationship at certain strain levels. This method is found to be more reliable than the traditional methods using crack onset strain. Parametric studies of the fracture energy release rate for the coating and interfacial compliance of the thin film system are conducted, through which the effect of plastic deformation on the channel cracking behavior is studied extensively. The results indicate that the tangent modulus of the substrate controls the evolution curvature of crack spacing where a smaller tangent modulusmore »
- Authors:
- Publication Date:
- Research Org.:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1545925
- Alternate Identifier(s):
- OSTI ID: 1364150
- Report Number(s):
- NREL/JA-2C00-68602
Journal ID: ISSN 0020-7683; S0020768317301919; PII: S0020768317301919
- Grant/Contract Number:
- FOA-0000861; AC36-08GO28308
- Resource Type:
- Published Article
- Journal Name:
- International Journal of Solids and Structures
- Additional Journal Information:
- Journal Name: International Journal of Solids and Structures Journal Volume: 120 Journal Issue: C; Journal ID: ISSN 0020-7683
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 14 SOLAR ENERGY; 36 MATERIALS SCIENCE; thin film; channel cracking; elasto-plastic fracture; polymer substrate; fracture toughness
Citation Formats
Zhang, Chao, Chen, Fangliang, Gray, Matthew H., Tirawat, Robert, and Larsen, Ross E. An elasto-plastic solution for channel cracking of brittle coating on polymer substrate. United States: N. p., 2017.
Web. doi:10.1016/j.ijsolstr.2017.04.033.
Zhang, Chao, Chen, Fangliang, Gray, Matthew H., Tirawat, Robert, & Larsen, Ross E. An elasto-plastic solution for channel cracking of brittle coating on polymer substrate. United States. https://doi.org/10.1016/j.ijsolstr.2017.04.033
Zhang, Chao, Chen, Fangliang, Gray, Matthew H., Tirawat, Robert, and Larsen, Ross E. Tue .
"An elasto-plastic solution for channel cracking of brittle coating on polymer substrate". United States. https://doi.org/10.1016/j.ijsolstr.2017.04.033.
@article{osti_1545925,
title = {An elasto-plastic solution for channel cracking of brittle coating on polymer substrate},
author = {Zhang, Chao and Chen, Fangliang and Gray, Matthew H. and Tirawat, Robert and Larsen, Ross E.},
abstractNote = {In this study, an elasto-plastic channel-cracking model is presented to study the open-mode fracture of a thin layer brittle coating grown on a polymer substrate. A linear elastic shear interlayer is introduced to describe the stress transfer from the elasto-plastic substrate to the brittle coating, on basis of the shear-lag principle. The channel cracking behavior involves three stages: elastic, elasto-plastic and plastic stages, which are solved in a continuous manner based on the deformation status of the substrate. Explicit solutions are derived for the mutli-stage cracking process. Corresponding experimental tests for a titanium oxide (TiO2) coating on a poly (ethylene terephthalate) substrate are conducted. The fracture toughness of the coating layer is estimated based on the crack spacing versus layer thickness relationship at certain strain levels. This method is found to be more reliable than the traditional methods using crack onset strain. Parametric studies of the fracture energy release rate for the coating and interfacial compliance of the thin film system are conducted, through which the effect of plastic deformation on the channel cracking behavior is studied extensively. The results indicate that the tangent modulus of the substrate controls the evolution curvature of crack spacing where a smaller tangent modulus corresponds to a slower saturation of crack spacing. The energy release rate also varies significantly with the properties of the interlayer. The study highlights the necessity of an elasto-plastic model for the thin film systems of brittle coating on a plastic substrate.},
doi = {10.1016/j.ijsolstr.2017.04.033},
journal = {International Journal of Solids and Structures},
number = C,
volume = 120,
place = {United States},
year = {Tue Aug 01 00:00:00 EDT 2017},
month = {Tue Aug 01 00:00:00 EDT 2017}
}
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Works referencing / citing this record:
Investigation on the effective parameters of through-the-width crack propagation in ceramic coatings due to substrate tension using discrete element method
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