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International Journal of Aerospace Engineering
Volume 2009, Article ID 486063, 22 pages
http://dx.doi.org/10.1155/2009/486063
Research Article

A Three-Dimensional Ply Failure Model for Composite Structures

Department of Mechanical Engineering, Aeronautical Institue of Technology (ITA), CTA-ITA-IEM, Praça Mal. Eduardo Gomes 50, 12228-900 São José dos Campos-SP, Brazil

Received 21 October 2008; Revised 28 January 2009; Accepted 23 June 2009

Academic Editor: Ever Barbero

Copyright © 2009 Maurício V. Donadon et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A fully 3D failure model to predict damage in composite structures subjected to multiaxial loading is presented in this paper. The formulation incorporates shear nonlinearities effects, irreversible strains, damage and strain rate effects by using a viscoplastic damageable constitutive law. The proposed formulation enables the prediction of failure initiation and failure propagation by combining stress-based, damage mechanics and fracture mechanics approaches within an unified energy based context. An objectivity algorithm has been embedded into the formulation to avoid problems associated with strain localization and mesh dependence. The proposed model has been implemented into ABAQUS/Explicit FE code within brick elements as a userdefined material model. Numerical predictions for standard uniaxial tests at element and coupon levels are presented and discussed.