Failure behavior of coated materials

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Results concerning the influence of a through coating crack on the substrate failure are reported. The problem is studied under the assumptions corresponding to small scale yielding conditions and calculations are performed by the finite element method. An approximate approach based on calculations of crack mouth opening displacement for thin protective layers is suggested. It is concluded that in the case of a stiffer coating on a more compliant substrate, the through coating cracks represent dangerous stress concentrators, and as a consequence of elastic mismatch of both materials, the critical applied stress for substrate failure decreases. Traditional approaches may have underestimated this effect and estimations of the service life of coated structures neglecting this phenomenon could lead to non-conservative values, with unexpected failures.

crack mouth opening displacement, crack propagation, bimaterial interface

2005-08-23

University of Zilina

Žilina

80-969165-4-8

10 th International Conference on Numerical Methods in Continuum Mechanics

47–48

2