Civil Engineering Faculty Research

Title

Dynamic Anti-plane Crack Analysis in Functional Graded Piezoelectric Semiconductor Crystals

Document Type

Article

Publication Date

Summer 6-2014

Abstract

This paper presents a dynamic analysis of an anti-plane crack in functionally graded piezoelectric semiconductors. General boundary conditions and sample geometry are allowed in the proposed formulation. The coupled governing partial differential equations (PDEs) for shear stresses, electric displacement field and current are satisfied in a local weak-form on small fictitious subdomains. The derived local integral equations involve one order lower derivatives than the original PDEs. All field quantities are approximated by the moving least-squares (MLS) scheme. After performing spatial integrations, we obtain a system of ordinary differential equations for the involved nodal unknowns. It is noted that the stresses and electric displacement field in functionally graded piezoelectric semiconductors exhibit the same singularities at crack tips as in a homogeneous piezoelectric solid. The influence of the initial electron density on the intensity factors and energy release rate is also investigated.

Publication Title

Computer Modeling in Engineering & Sciences

Volume

99

Issue

4

First Page

273

Last Page

296