Journal
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
Volume 75, Issue -, Pages 55-65Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijmecsci.2013.06.006
Keywords
Elastodynamic analysis; Imperfect coating; Dynamic stress intensity factors; Hoop stress
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Fracture behavior of an orthotropic strip with an orthotropic functionally graded coating weakened by multiple defects under time-harmonic excitation is investigated in this paper. Imperfect bonding between layers is assumed and the problem is divided to analytical and computational parts using distributed dislocation technique. The dislocation densities are employed to determine dynamic stress intensity factors for multiple smooth cracks and hoop stress on cavities. Cavities are considered as closed curved cracks without singularity. Several examples are provided to investigate the effects of angular frequency of loading, characteristic length of defects and material properties on the dynamic fracture behavior of interacting cracks and cavities. The obtained results can be used to design coating-substrate structures under anti-plane time-harmonic loading. (C) 2013 Elsevier Ltd. All rights reserved.
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