Effects of partial discharges on crack growth in dielectrics

Cun-Fa Gao; Naotake Noda
April 2005
Applied Physics Letters;4/18/2005, Vol. 86 Issue 16, p162904
Academic Journal
Effects of partial discharge of air inside a cracklike flaw on crack growth in a dielectric solid are studied. The energy release rate is first derived for a slender elliptical flaw with an arbitrary permittivity in an infinite dielectric solid under remote electric loading. Based on the streamer-type discharge mechanism, the energy release rate for the discharged crack is presented, and then used as a failure criterion to predict the effects of electric fields on crack growth in a dielectric material. It is shown that pure electric loading can lead to crack propagation when partial discharges happen.


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