A stretch/bend method for the in situ measurement of the delamination toughness of coatings attached to substrates is described. A beam theory analysis is presented that illustrates the main features of the test. The analysis is general and allows for the presence of residual stress. It reveals that the test produces stable extension of delaminations, rendering it suitable for multiple measurements in a single test. It also provides scaling relations and enables estimates of the loads needed to extend delaminations. Finite element calculations reveal that the beam theory solutions are accurate for slender beams, but overestimate the energy release rate for stubbier configurations and short delaminations. The substantial influence of residual stress on the energy release rate and phase angle is highly dependent on parameters such as the thickness and modulus ratio for the two layers. Its effect must be included to obtain viable measurements of toughness. In a companion paper, the method has been applied to a columnar thermal barrier coating deposited onto a Ni-based super-alloy.
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January 2011
Research Papers
A Stretch/Bend Method for In Situ Measurement of the Delamination Toughness of Coatings and Films Attached to Substrates
M. Y. He,
M. Y. He
Department of Materials,
University of California, Santa Barbara
, Santa Barbara, CA 93106-5050
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J. W. Hutchinson,
J. W. Hutchinson
School of Engineering and Applied Sciences,
Harvard University
, Cambridge, MA 02138
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A. G. Evans
A. G. Evans
Department of Materials,
University of California, Santa Barbara
, Santa Barbara, CA 93106-5050
Search for other works by this author on:
M. Y. He
Department of Materials,
University of California, Santa Barbara
, Santa Barbara, CA 93106-5050
J. W. Hutchinson
School of Engineering and Applied Sciences,
Harvard University
, Cambridge, MA 02138
A. G. Evans
Department of Materials,
University of California, Santa Barbara
, Santa Barbara, CA 93106-5050J. Appl. Mech. Jan 2011, 78(1): 011009 (5 pages)
Published Online: October 13, 2010
Article history
Received:
February 22, 2010
Posted:
June 9, 2010
Revised:
June 25, 2010
Published:
October 13, 2010
Online:
October 13, 2010
Citation
He, M. Y., Hutchinson, J. W., and Evans, A. G. (October 13, 2010). "A Stretch/Bend Method for In Situ Measurement of the Delamination Toughness of Coatings and Films Attached to Substrates." ASME. J. Appl. Mech. January 2011; 78(1): 011009. https://doi.org/10.1115/1.4001938
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