Abstract
This paper analyzes the transient response of the dynamic stress intensity factor for an interfacial crack of a functionally graded piezoelectric material (FGPM) coated on the surface of a homogeneous piezoelectric substrate. Different from previous analyses, this study mainly considers a realistic situation when electromechanical loadings are suddenly applied at the material surface. Obtained results are compared with those when the crack surfaces are directly loaded by the same impacts. By using the integral transform method, the problem is reduced to solving two singular integral equations. It is found that dynamic stress intensity factors are significantly amplified and reduced depending on the negative and positive gradient for electromechanical impacts at the material surface. Positive or negative electric impact also decreases or increases the overshoot of the dynamic stress intensity factor. It is suggested that designing an FGPM with a positive gradient index is safer than a negative gradient index.
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Peng, XL., Li, XF. & Lee, K.Y. Interface crack problem of functionally graded piezoelectric materials: effects of the position of electromechanical impact and gradient. Acta Mech 207, 69–82 (2009). https://doi.org/10.1007/s00707-008-0108-5
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DOI: https://doi.org/10.1007/s00707-008-0108-5