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Mesure et calcul des contraintes résiduelles dans les pièces injectées en thermoplastiques avec et sans fibres de renfort

Abstract : First, phenomena at the origin of residual stresses in injection molding of thermoplastic polymers are described, and the specificity of fiber reinforced thermoplastic is introduced. Heterogeneous cooling associated with mechanical behavior variations leads to thermal stresses. Frozen-in pressure induced stresses are specific to the injection molding process. Fibers induce heterogeneity and anisotropy of mechanical behavior and thermal shrinkage. Second, a measurement technique based on the layer removal method and measurement of the bending moment is presented. It allows the determination of residual stresses in anisotropic materials such as fiber reinforced thermoplastics. The influence of the milling process is discussed. Tensile stresses in the core and compression stresses in the surface are usually obtained. Packing pressure and time, mold temperature, fiber concentration have an influence on the stress profiles.
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https://pastel.archives-ouvertes.fr/tel-00392610
Contributor : Magalie Prudon <>
Submitted on : Monday, June 8, 2009 - 3:16:05 PM
Last modification on : Thursday, September 24, 2020 - 5:22:54 PM
Long-term archiving on: : Friday, June 11, 2010 - 12:29:02 AM

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  • HAL Id : tel-00392610, version 1

Citation

Thomas Giroud. Mesure et calcul des contraintes résiduelles dans les pièces injectées en thermoplastiques avec et sans fibres de renfort. Mécanique [physics.med-ph]. École Nationale Supérieure des Mines de Paris, 2001. Français. ⟨tel-00392610⟩

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