Propagation d'une onde viscoélastique le long d'une barre en PMMA et réalisation d'essais dynamiques sur le polyuréthanne

Abstract : To study the high strain-rate mechanical behaviour of polymers, it is suggested to generalize the split Hopkinson bar technique by using polymeric bars. The key of such a generalization lies in the method for determining the stresses and particle velocities at two interfaces of specimen from the strain pulse signals measured at the strain gauges located in a distance from the interface, taking account of the dispersion and dissipation of viscoelastic wave propagating in polymer bars. Based on a viscoelastic constitutive equation and the characteristics theory, such a method is developed and discussed in detail. Computational simulations of viscoelastic waves propagating in PMMA, PC and epoxy bars are presented, showing the influence of material parameters on the character of viscoelastic waves. A wave propagation method is suggested for determining the dynamic viscoelastic constitutive equation of polymers. The good agreement between the experimental wave measurements and the theoretical predictions based on the measured material parameters confirms the validity of the suggested method. The dynamic mechanical behaviour of polyurethane is shown finally using the Andrews criteria and a statistical approach
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Kamel Labibes. Propagation d'une onde viscoélastique le long d'une barre en PMMA et réalisation d'essais dynamiques sur le polyuréthanne. Autre. Université Paul Verlaine - Metz, 1994. Français. ⟨NNT : 1994METZ033S⟩. ⟨tel-01776117⟩

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