J. Phys. IV France 110 (2003) 159
Thermomechanical properties of polycarbonate under dynamic loadingV. Lerch1, G. Gary2 and P. Hervé1
1 Laboratoire d'Énergétique et d'Économie en Énergie, Université Paris X, 1 chemin Desvallières, 92410 Ville-d'Avray, France
2 Laboratoire de Mécanique des Solides, École Polytechnique, route de Saclay, 91128 Palaiseau, France
In the present study, dynamic compression tests have been performed on polycarbonate (PC) specimen for strain rates in the range of 500 to 2000s -1 and on aluminum for a strain rate around 1300s -1 using a Split Hopkinson Pressure Bar (SHPB). Temperature measurement has been carried out using a fast response infrared optical pyrometer which is able to measure the surface temperature rise of a specimen during the tests. The temperature data shows that the mechanical work is not completely converted into heat. It implies the existence of a stored energy within the material and possibly a subsequent delay for the conversion of mechanical work into heat.
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