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Cyclic behaviour of short glass fibre reinforced polyamide: Experimental study and constitutive equations
- Source :
-
International Journal of Plasticity . Aug2011, Vol. 27 Issue 8, p1267-1293. 27p. - Publication Year :
- 2011
-
Abstract
- Abstract: Polymer matrix composites are widely used in the automotive industry and undergo fatigue loadings. The investigation of the nonlinear cyclic behaviour of such materials is a required preliminary work for a confident fatigue design, but has not involved many publications in the literature. This paper presents an extensive experimental study conducted on a polyamide 66 reinforced with 35wt% of short glass fibres (PA66 GF35), at room temperature. The material was tested in two conditions: dry-as-moulded (DAM) and at the equilibrium with air containing 50% of relative humidity (RH50). An exhaustive experimental campaign in tensile mode has been carried out, including various strain or stress rates, complex mechanical histories and local thermo-mechanical recordings. Such an extended database allowed us to highlight several complex physical phenomena: viscoelastic effects at different time scales, irrecoverable mechanisms, non-linear kinematic hardening, non-linear viscous flow rule, cyclic softening. Taking into account this advanced analysis, a constitutive model describing the cyclic behaviour is proposed. As the experimental database only includes uniaxial tensile tests, the general 3D anisotropic frame is reduced to an uniaxial model valid for a specific orientation distribution. The robust identification process is based on tests which enable the uncoupling between the underlined mechanical features. This strategy leads to a model which accurately predicts the cyclic behaviour of conditioned as well as dry materials under complex tensile loadings. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 07496419
- Volume :
- 27
- Issue :
- 8
- Database :
- Academic Search Index
- Journal :
- International Journal of Plasticity
- Publication Type :
- Academic Journal
- Accession number :
- 60787962
- Full Text :
- https://doi.org/10.1016/j.ijplas.2011.02.005