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A simple glassy polymer model

A practical framework for the strain-rate and temperature dependent behaviour of polycarbonate
 
: Ganzenmüller, Georg; Patil, Sankalp; Maurer, Michael; Sauer, Martin; Jung, Markus; Hiermaier, Stefan

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Journal of dynamic behavior of materials 5 (2019), No.3, pp.331-343
ISSN: 2199-7446 (Print)
ISSN: 2199-7454 (Online)
English
Journal Article
Fraunhofer EMI ()
polymers; dynamic behaviour; Split Hopkinson Bar; constitutive model

Abstract
This work presents a simple and robust material model, suitable for dynamic simulations of glassy polymers such as Polycarbonate. The new model reduces the complex stress/strain behavior and its dependence on strain rate and temperature to a simple set of characteristics. Utilizing a time–temperature superposition principle, these characteristics serve as input for a purely empirical fitting approach, which provides an accurate representation of the material behaviour over a wide range of strain rates and temperatures. Calibration data including failure at high rates is obtained using a split Hopkinson tension bar. To demonstrate the applicability of the new model, it is parameterized using high strain rate data and its simulation predictions compared to a gas gun impact experiment wherein a Polycarbonate plate is subjected to the impact of a steel sphere at temperatures between 23–80 °C and 56–75 m/s.

: http://publica.fraunhofer.de/documents/N-552700.html