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Digital image correlation approach to cracking and decohesion in a brittle coating/ductile substrate system

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Open access
Authors
Wu, D.J.
Mao, W.G.
Zhou, Y.C.
Lu, Chungsheng
Date
2011
Type
Journal Article

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Wu, D.J. and Mao, W.G. and Zhou, Y.C. and Lu, C. 2011. Digital image correlation approach to cracking and decohesion in a brittle coating/ductile substrate system. Applied Surface Science. 257 (14): pp. 6040-6043.
Source Title
Applied Surface Science
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Department of Mechanical Engineering
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NOTICE: This is the author’s version of a work that was accepted for publication in Applied Surface Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to thiswork since it was submitted for publication. A definitive version was subsequently published in Applied Surface Science [257, 14, 2011] DOI 10.1016/j.apsusc.2011.01.119

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Abstract

By using a digital image correlation technique, the full/local field strain in a brittle coating/ductile substrate system during tension has been successfully monitored. One of the most important experimental results indicates that the distribution of interfacial shear stress in the segmented coating is antisymmetric about the center, which clarifies several controversial assumptions introduced in theoretical models. Two key mechanical properties of thermal barrier coatings, fracture strength in coating and interfacial adhesion strength, were determined as 35.0 ± 4.6 and 14.1 ± 3.2 MPa, respectively, which are consistent with available experimental data.