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Approche cinétique du comportement en fatigue du Polyamide 66 renforcé par 30% de fibres de verre

Abstract : In this work, the fatigue behavior of short glass fibers reinforced polyamide 66 has been investigated. This material has many applications where it undergoes dynamic loads, such as parts of under the hood of a vehicle. The comprehension of micro-mechanisms which govern the fatigue behavior of this material have a key role to design these parts. In order to observe the influence of load direction respect to fiber orientation two kinds of applied load were selected; Tension-Tension Fatigue tests and Alternative Flexural Fatigue were carried out. For both tests, the surface temperature increases with an increasing applied load. The results show that an increasing self heating temperature depends on frequency and applied load level. Self heating temperature has an important effect in the failure point where the Wohler curves join each other. During the damage initiation period, no change of macroscopic properties, density, cristallinity ratio, glass transition temperature, flexural elastic modulus is observed. One break just before the final fracture allows the relaxation of microdefects and increases the number of cycles at fracture. The life time has been modeled for Polyamide 66 and its composite.
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https://pastel.archives-ouvertes.fr/pastel-00603374
Contributor : Bardia Esmaeillou <>
Submitted on : Friday, June 24, 2011 - 5:46:28 PM
Last modification on : Friday, July 17, 2020 - 2:54:11 PM
Long-term archiving on: : Sunday, September 25, 2011 - 2:25:55 AM

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  • HAL Id : pastel-00603374, version 1

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Bardia Esmaeillou. Approche cinétique du comportement en fatigue du Polyamide 66 renforcé par 30% de fibres de verre. Mécanique des matériaux [physics.class-ph]. Arts et Métiers ParisTech, 2011. Français. ⟨NNT : 2010ENAM0019⟩. ⟨pastel-00603374⟩

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