Singularities at the tip of a crack on the interface of piezoelectric bodies |
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Authors: | S A Nazarov M Specovius-Neugebauer |
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Institution: | 1. Institute of Applied Engineering, Russian Academy of Sciences, St.Petersburg, Russia 2. Universit?t-GH Kassel, Kassel, Germany
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Abstract: | Singularities of elastic and electric fields are investigated at the tip of a crack on the interface of two anisotropic piezoelectric
media under various boundary conditions on the crack surfaces. The singularity exponents form the spectrum of a certain polynomial
pencil, and although explicit formulas are not available, this spectrum is described completely though. The mathematical results
apply to problems in fracture mechanics. In this way the Griffith formulas are obtained for increments of energy functionals
due to the growth of the crack, and the notion of energy release matrix is introduced. Normalization conditions for bases
of singular solutions are proposed to adapt them to energy, stress, and deformation fracture criteria. Connections between
these bases are determined, and additional properties of the deformation basis related to the notion of electric surface enthalpy
are established. Bibliography: 44 titles.
Dedicated to Vsevolod Alekseevich Solonnikov
Translated from Zapiski Nauchnykh Seminarov POMI, Vol. 362, 2008, pp. 241–271. |
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