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Article Dans Une Revue Polymer Année : 2014

Acoustic emission from the initiation of plastic deformation of Polyethylenes during tensile tests

Résumé

The acoustic emission (AE) technique has been used in the aim to detect and to observe the initiation of plasticity and damage of several Polyethylenes (PE) during tensile tests. The detection of acoustic signals originating from the deformation of the material is challenging since PE samples strongly attenuate ultrasonic waves. A weak acoustic activity has been recorded during the tests. The use of two types of PE specimens and two methodologies based on the elimination and the discrimination of spurious sources has shown that most of the AE signals truly originate from the plastic deformation of materials. We also observed that the acoustic activity increases with strain rate. Besides, some AE signals are located along the specimen length during tensile tests at high strain rate. The acoustic activity increases strongly with the crystallinity. Micro-cavities, formed before the yield point of PE samples with high crystallinity in particular, likely initiate the release of acoustic energy. In addition, some signals are collected on PE samples, which do not exhibit a formation of cavitation. Hence, the shearing of crystallites and/or the fragmentation of crystalline lamellae may also be a source of the release of acoustic energies.

Domaines

Matériaux
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Dates et versions

hal-01113079 , version 1 (04-02-2015)

Identifiants

Citer

Nicolas Casiez, Stéphanie Deschanel, Thomas Monnier, O. Lame. Acoustic emission from the initiation of plastic deformation of Polyethylenes during tensile tests. Polymer, 2014, 55, pp.6561 - 6568. ⟨10.1016/j.polymer.2014.09.044⟩. ⟨hal-01113079⟩
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