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A dynamic
electro-thermo-mechanical model of dielectric breakdown in
solids using peridynamics
Raymond A. Wildman and George A. Gazonas |
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Vol. 10 (2015), No. 5, 613–630
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DOI: 10.2140/jomms.2015.10.613
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Abstract |
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The electro-thermo-mechanical breakdown of dielectric solids is modeled using peridynamics to describe the brittle fracture of a material under high electric fields. A coupled electrostatic, elastodynamic, thermodynamic model is used wherein electrostatic forces are computed and applied to the mechanical model and temperature effects are included. Fracture is simulated using peridynamics, a reformulation of elasticity that incorporates material failure. Coupling occurs between the electrostatic and mechanical forces and also the electrical material properties: specifically, the Lorentz and Kelvin forces are used to couple the electrostatic fields to the stress fields, conductivity is treated as nonlinear and a function of temperature, and mechanical damage is used to alter the permittivity. Results demonstrate that the method is capable of reproducing branching breakdown patterns seen in experiments using a deterministic method. |
Keywords
dielectric breakdown, peridynamics, electromechanical,
multiphysics
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Milestones
Received: 15 April 2015
Revised: 29 September 2015
Accepted: 19 October 2015
Published: 10 December 2015
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Authors |
| Raymond A. Wildman | |
| Weapons and Materials Research
Directorate U.S. Army Research Laboratory Aberdeen Proving Ground, MD 21005 United States |
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| George A. Gazonas | |
| Weapons and Materials Research
Directorate U.S. Army Research Laboratory Aberdeen Proving Ground, MD 21005 United States |
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