tt . - ) q Crack Branching and Deflection in Piezoelectric Materials
نویسنده
چکیده
The problem of crack branching and deflection in bi-material system is considered in this paper. The combinations may be piezoelectric-piezoelectric, or piezoelectric and non-piezoelectric. Based on Stroh's formulation for anisotropic material, Green's functions for various bi-material combinations are presented within the framework of two-dimensional electro-elasticity, allowing the crack problem to be expressed in terms of coupled singular integral equations. Then, a set of singular integral equations is developed and solved numerically. The crack path selection is investigated using the integral equations and the maximum energy release rate criterion. Numerical results are presented to study the role of remote electro-elastic loads on the path selection of crack extension.
منابع مشابه
Crack deflection at an interface between dissimilar piezoelectric materials
The problem of crack deflection in bimaterial systems is considered in this paper. The material combinations may be of piezoelectric-piezoelectric, or one is piezoelectric and the other is not. Based on the Stroh formulation for anisotropic material, Green’s functions for various bimaterial combinations are presented within the framework of two-dimensional electroelasticity, allowing the crack ...
متن کاملThermal analysis for cracks near interfaces between piezoelectric materials
A crack of arbitrary size and orientation near bimaterial interfaces between dissimilar thermopiezoelectric materials is considered . A system of singular integral equations for the unknown thermal analog of dislocation density defined on the crack faces is derived by way of the Stroh's formulation and the thermoelectroelastic Green's fUflctions developed recently. The stress and electric displ...
متن کاملDynamic Photoelastic Validation of Large Scale Fracture and Fragmentation Simulations
A detailed experimental and numerical investigation has been performed to validate large scale numerical simulations of dynamic crack propagation, branching, deflection, and penetration at interfaces in brittle homogeneous materials. High-speed photography in conjunction with the dynamic photoelasticity has been used to observe real-time failure mode transition mechanism at the interfaces. Wedg...
متن کاملOn Global Energy Release Rate of a Permeable Crack in a Piezoelectric Ceramic
A permeable crack model is proposed to analyze crack growth in a piezoelectric ceramic. In this model, a permeable crack is modeled as a vanishing thin, finite dimension, rectangular slit with dielectric medium inside. A first-order approximation solution is derived in terms of the slit height, h0 . The main contribution of this paper is that the newly proposed permeable crack model reveals tha...
متن کاملMultiple Moving Cracks in an Orthotropic Strip Sandwiched between Two Piezoelectric Layers
Dynamic fracture mechanics of layered materials has been gaining lots of attentions among the researchers where the layered materials are extensively used in various products and devices to improve structural performance such as strength and durability. The influence of the crack moving speed on the the stress intensity factors was a popular subject in classical elastodynamics. Among the models...
متن کامل