Repository logo
 

Numerical analysis of quasi-static fracture in functionally graded materials

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Martínez-Pañeda, Emilio  ORCID logo  https://orcid.org/0000-0002-1562-097X
Gallego, Rafael 

Abstract

This work investigates the existing capabilities and limitations in numerical modeling of fracture problems in functionally graded materials (FGMs) by means of the well-known finite element code ABAQUS. Quasi-static crack initiation and growth in planar FGMs is evaluated. Computational results of fracture parameters are compared to experimental results and good agreement is obtained. The importance of the numerical fit of the elastic properties in the FE model is analyzed in depth by means of a sensitivity study and a novel method is presented. Several key computational issues derived from the continuous change of the material properties are also addressed and the source code of a user subroutine USDFLD is provided in the Appendix for an effective implementation of the property variation. The crack propagation path is calculated through the extended finite element method and subsequently compared to available experimental data. Suitability of local fracture criteria to simulate crack trajectories in FGMs is discussed and a new crack propagation criterion is suggested.

Description

Keywords

Functionally graded material (FGM), Finite element method (FEM), Fracture mechanics, Crack propagation, Extended finite element method (X-FEM)

Journal Title

International Journal of Mechanics and Materials in Design

Conference Name

Journal ISSN

1569-1713
1573-8841

Volume Title

11

Publisher

Springer Link

Rights

All rights reserved