Fracture analysis of a functionally graded piezoelectric coating with viscoelastic interfaces

In this paper, the fracture problem for a functionally graded coating with a Kelvin-type viscoelastic interface is studied. The functionally graded piezoelectric layer contains an electrically permeable anti-plane crack that is parallel to the interface. By utilizing the integral transformation and singular integral equation techniques, the crack problem is solved numerically. The effects of the physical, graded parameter and geometrical parameters on the stress intensity factor (SIF) are investigated. With time elapsing, the effect of viscoelastic interface becomes weaker and weaker. The effect of the viscoelastic interface on the fracture behavior of the functionally graded piezoelectric coating also depends on the substrate thickness.