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Deformation mechanisms in compression-loaded, stand-alone plasma-sprayed alumina coatings

Trice, Rodney W. and Prine, David W. and Faber, K. T. (2000) Deformation mechanisms in compression-loaded, stand-alone plasma-sprayed alumina coatings. Journal of the American Ceramic Society, 83 (12). pp. 3057-3064. ISSN 0002-7820. http://resolver.caltech.edu/CaltechAUTHORS:20140908-181323547

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Abstract

Cylindrical, stand-alone tubes of plasma-sprayed alumina were tested in compression in the axial direction at room temperature, using strain gauges to monitor axial and circumferential strains. The primary compression-loading profile used was cyclic loading, with monotonically increased peak stresses. Hysteresis was observed in the stress-strain response on unloading, beginning at a peak stress of 50 MPa. The modulus decreased as the maximum applied stress increased. The stress-strain response was only linear at low stresses; the degree of nonlinearity at high stresses scaled with the stress applied. One-hour dwells at constant stress at room temperature revealed a time-dependent strain response. Using transmission electron microscopy and acoustic emission to investigate deformation mechanisms, the stress-strain response was correlated with crack pop in, growth, and arrest. It is proposed that the numerous defects in plasma-sprayed coatings, including porosity and microcracks, serve as sites for crack nucleation and/or propagation. As these small, nucleated cracks extend under the applied stress, they propagate nearly parallel to the loading direction along interlamellae boundaries. With increasing stress, these cracks ultimately link, resulting in catastrophic failure.


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Related URLs:
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http://dx.doi.org/10.1111/j.1151-2916.2000.tb01682.xDOIArticle
http://onlinelibrary.wiley.com/doi/10.1111/j.1151-2916.2000.tb01682.x/abstractPublisherArticle
Additional Information:© 2000 The American Ceramic Society. Manuscript No. 188737. Received February 1, 2000; approved June 8, 2000. Supported by the U. S. Department of Energy, Federal Energy Technology Center, under Cooperative Agreement No. DE-FC21-92MC29061, Subcontract No. 96–01-SR047. The authors gratefully acknowledge the financial support of the U.S. Department of Energy, Federal Energy Technology Center. The authors also wish to thank Dan Marron of the Infrastructure Technology Institute for assistance setting up the data-acquisition hardware and software used in this study, Mark Sinew for his mechanical testing expertise in solving alignment problems associated with testing tubes, and Rick Marzec for his assistance with fabrication of the plasma-sprayed tubes.
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Funding AgencyGrant Number
Department of Energy (DOE)DE-FC21-92MC29061
Record Number:CaltechAUTHORS:20140908-181323547
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140908-181323547
Official Citation:Trice, R. W., Prine, D. W. and Faber, K. T. (2000), Deformation Mechanisms in Compression-Loaded, Stand-Alone Plasma-Sprayed Alumina Coatings. Journal of the American Ceramic Society, 83: 3057–3064. doi: 10.1111/j.1151-2916.2000.tb01682.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49395
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:09 Sep 2014 20:19
Last Modified:09 Sep 2014 20:19

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