Multiscale analysis of aeronautical composite structures using High Fidelity Generalized Method of Cells

Ivančević, Darko and Smojver, Ivica (2012) Multiscale analysis of aeronautical composite structures using High Fidelity Generalized Method of Cells. = Multiscale analysis of aeronautical composite structures using High Fidelity Generalized Method of Cells. In: 6th European Congress on Computational Methods in Applied Sciences and Engineering, ECCOMAS 2012, 10-14. 9. 2012., Vienna; Austria.

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Abstract

The paper deals with the problem of micromechanical failure initiation criteria for complex composite structural components. Heterogeneity of composite materials is the source of numerous failure mechanisms which can develop in fiber reinforced composite materials. This fact has led to the idea of performing failure and damage analyses on the constituent level using micromechanical principles. Computation at the micro-scale has been performed employing a modification of the High Fidelity Generalized Method of Cells (HFGMC), which has been implemented into the finite element code Abaqus/Explicit. The HFGMC model is implemented into Abaqus via the user material subroutine VUMAT. The result of the micromechanical procedure is the computation of strain concentration tensors, which relate the strain tensor at the macro-level to the strain tensor of each subcell. This enables calculation of the stress field within the unit cell, based on the constitutive behavior of each subcell. As the stress distribution is determined for the representative unit cells, calculation of failure criteria and constitutive response of the composite are performed on the micro-level. In order to select an appropriate failure criterion which will initiate damage processes on the subcell level, the most commonly used micromechanical failure criteria have been evaluated against ply-based failure criteria. The HFGMC model has been tested on a relatively simple finite element model, representing a typical structural component of aeronautical structures. Parametric analyses using different unit cell refinement levels have been performed. Results of micromechanical analyses confirm significant discrepancies among the applied failure criteria and dependence on unit cell refinement.

Item Type: Conference or Workshop Item (Lecture)
Keywords (Croatian): Aeronautical structures; Complex composites; Constitutive behaviors; Damage analysis; Damage process; Failure criteria; Failure initiation; Failure mechanism; Finite element codes; Finite element models; High-fidelity generalized method of cells; In-fiber; Micro-mechanical; Micro-mechanical analysis; Micro-scales; Micromechanical model; Multi scale analysis; Parametric analysis; Strain concentration; Strain tensor; Stress field; Structural component; Unit cells; User material subroutine, Aerodynamics; Cells; Composite materials; Computational methods; Cytology; Electronic publishing; Finite element method; Stress concentration; Tensors, Safety engineering, Aerodynamics; Cells; Composites; Electronics; Failure; Finite Element Analysis; Safety; Stress Concentration
Subjects: TECHNICAL SCIENCE
Divisions: 1300 Department of Aeronautical Engineering > 1310 Chair of Aerodynamics
Indexed in Web of Science: No
Indexed in Current Contents: No
Citations SCOPUS: 0 (30.4.2015.)
Date Deposited: 30 Apr 2015 10:25
Last Modified: 30 Apr 2015 10:25
URI: http://repozitorij.fsb.hr/id/eprint/3895

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