DAMAGE, FRACTURE AND FATIGUE FOR THE PIEZOELECTRIC AND FERROELECTRIC MEDIUM

Damage and dynamic fracture of the piezoelectric medium is an important branch of the fracture of smart materials and structures. Some new solutions for the damaged medium with micro-crack and micro-void are addressed and several solutions of dynamic fracture, wave scattering of crack weakened piezoelectric-medium under mode III and mode I for the response of electrical-mechanical impact are given. Two different boundary conditions of the surface for impermeable and perfect electric contact of crack surface are discussed. Domain polarization switch near the tip of a flaw plays a critical role on the fracture and fatigue behavior of ferroelectric ceramics under electrical and/or mechanical loading. We will discuss three types of experiments, and propose the pertinent meso-mechanics models based on domain switching to explain the data