Article révisé par les pairs
| Résumé : | Mechanical damping measurements were made by torsion at 1 Hz on strained polycarbonate (PC) samples at ambient temperature. A marked thermal and mechanical history dependence of the damping during straining was observed. Adopting a simple rheological system to simulate the mechanical behaviour of PC, it appeared that the evolution of the damping during straining may be ascribed to a change in the viscosity. A model is proposed linking the creep strain and the damping to the same viscous process, governed by a linear time dependence of the viscosity, in agreement with a configurational evolution similar to that produced by physical ageing. Creep and tensile damping data obtained on quenched samples are used to test the validity of the model. Satisfactory agreement is obtained between the theoretical curves derived from the model and the data. © 1988. |
