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- Notta-Cuvier, D., et al.
(author)
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An efficient modelling of inelastic composites with misaligned short fibres
- 2013
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In: International Journal of Solids and Structures. - : Pergamon Press. - 0020-7683 .- 1879-2146. ; 50:19, s. 2857-2871
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Journal article (peer-reviewed)abstract
- This paper deals with the modelling of the behaviour of short-fibre reinforced composites. The composite is seen as an assembly of a matrix medium and of several fibre media. Each fibre medium, characterised by its own orientation of fibres and volume fraction, is considered as a one-dimensional elastic medium. The matrix material has an elastoplastic behaviour. All types of hardening laws can be considered, thanks to a valuable adaptivity of the modelling. The use of the Drucker-Prager criterion for plasticity and non-associative plasticity rules allow to deal with compressible plastic flow. Moreover, all kind of orientation of fibres, in particular random orientations and imperfect alignments, can be modelled in a simple way. The influence of the fibres' orientation on the mechanical response of a polymer matrix composite subjected to tensile/compression tests is analysed in detail. Finally, simulated behaviours of composites are compared to experimental data found in the literature.
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| 2. |
- Notta-Cuvier, D., et al.
(author)
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Damage of short-fibre reinforced materials with anisotropy induced by complex fibres orientations
- 2014
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In: Mechanics of materials. - : Elsevier. - 0167-6636 .- 1872-7743. ; 68, s. 193-206
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Journal article (peer-reviewed)abstract
- In this paper, a behaviour model for damageable elastoplastic materials reinforced with short fibres that have complex orientations is. proposed. The composite material is seen as the assembly of the matrix medium and several linear elastic fibre media. Its macroscopic behaviour is computed thanks to an additive decomposition of the state potential, with no need to implement complex methods of homogenisation. A 4th-order tensor that depends on the characteristics of each fibre medium is introduced to model the anisotropic damage of the matrix material induced by the reinforcement, as well as the progressive degradation of the fibre-matrix interface. The division of short fibres into several families means that complex distributions of orientation or random orientation can be easily modelled. The model is tested for the case of a polyamide reinforced with different contents of short-glass fibres with distributed orientations and subjected to uniaxial tensile tests in different loading directions. The comparison of the results with experimental data (extracted from the literature) demonstrates the efficiency of the model.
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