Journal
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
Volume 43, Issue 7-8, Pages 2318-2335Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2005.06.040
Keywords
yield stress; mechanical response; PC; PMMA; PAI; amorphous polymers; strain rate effect; temperature effect; pressure effect; experiments; modeling
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Uniaxial compression stress-strain tests were carried out on three commercial amorphous polymers: polycarbonate (PC), polymethylmethacrylate (PMMA), and polyamideimide (PAI). The experiments were conducted under a wide range of temperatures (-40 degrees C to 180 degrees C) and strain rates (0.0001 s(-1) up to 5000 s-1). A modified split-Hopkinson pressure bar was used for high strain rate tests. Temperature and strain rate greatly influence the mechanical response of the three polymers. In particular, the yield stress is found to increase with decreasing temperature and with increasing strain rate. The experimental data for the compressive yield stress were modeled for a wide range of strain rates and temperatures according to a new formulation of the cooperative model based on a strain rate/temperature superposition principle. The modeling results of the cooperative model provide evidence on the secondary transition by linking the yield behavior to the energy associated to the beta mechanical loss peak. The effect of hydrostatic pressure is also addressed from a modeling perspective. (c) 2005 Elsevier Ltd. All rights reserved.
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