Translator Disclaimer
13 August 2003 Influence of the fracture process zone in ferroelectrics on the effective fracture toughness
Author Affiliations +
A model is presented to calculate the influence of ferroelectric/ferroelastic domain switching near a crack tip on the effective fracture toughness of piezoelectric ceramics. The switch-toughening effect is quantified in terms of intrinsic field intensity factors accounting for residual fields within the fracture process zone which are due to constraints at the boundary of the switching zone. The intrinsic field intensity factors themselves depend on the external electromechanical loading of the cracked body and thus can clearly be expressed in terms of the intensity factors of the applied loading. These can also account for the effects of an electrical permeability of the crack. The extension of the process zone is calculated using closed-form solutions for the asymptotic crack tip fields in connection with a domain switching criterion. Subsequently, the amount of switch-toughening is calculated applying a weight function technique. Therefore, crack weight functions have been derived for the real anisotropy in piezoelectrics.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Andreas Ricoeur and Meinhard Kuna "Influence of the fracture process zone in ferroelectrics on the effective fracture toughness", Proc. SPIE 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, (13 August 2003);

Back to Top