Viscoelastic behavior of polycarbonate at room temperature and non-linear constitutive law description of the sub yield behavior are determined using pseudotime or material clock concepts of non-linear viscoelasticity. The energy clock model was tested using the single-step and two-step stress relaxation experiment and was compared to the original BKZ and a modified Boltzman equation. Results showed that the clock model described the second step torque response in which the deformation returns fully to zero; however, the model over estimated the magnitude of the negative torque obtained upon reaching the zero deformation.
|Number of pages||4|
|State||Published - 1995|
|Event||Proceedings of the 53rd Annual Technical Conference. Part 1 (of 3) - Boston, MA, USA|
Duration: May 7 1995 → Oct 11 1995
|Conference||Proceedings of the 53rd Annual Technical Conference. Part 1 (of 3)|
|City||Boston, MA, USA|
|Period||05/7/95 → 10/11/95|