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مجله بین المللی پلاستیسیته
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • cyclic behaviour of short glass fibre reinforced polyamide: experimental study and constitutive equations

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    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 811
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     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 35 wt% 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.

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