Effect of thermal treatments on the yielding of polycarbonate

Authors

  • E. Kontou

    Corresponding author
    1. Department of Applied Mathematical and Physical Sciences, Section of Mechanics, National Technical University of Athens, 5 Heroes of Polytechnion, GR-15773, Athens, Greece
    • Department of Applied Mathematical and Physical Sciences, Section of Mechanics, National Technical University of Athens, 5 Heroes of Polytechnion, GR-15773, Athens, Greece
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Abstract

Two different thermal treatments were applied to polycarbonate (PC) in terms of slow cooling (annealed samples) after a thermal treatment at a temperature above the glass-transition temperature or abrupt cooling in a liquid-nitrogen environment (quenched samples). Tensile and compression experiments were performed on the two types of samples at three different effective strain rates. A viscoplastic model based on the fundamental assumptions of the Eyring model and on a kinematic formulation, which separated the viscoelastic and plastic strain, developed in previous works, was used to describe the yield and postyield behavior of thermally treated PC. The different thermal treatments affected the parameters of the material microstructure. A satisfactory agreement between the experimental data and calculated results was found. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 796–805, 2005

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