The yield stress of amorphous glassy polymers depends strongly on the strain rate, temperature, and hydrostatic pressure. On the other hand, the yield criteria, valid for metals, do not describe this behavior. Therefore, the yield phenomenon of the polymeric glassy state must be mainly a nonlinear v
Simulation of viscoelastic behavior of glassy polymers
β Scribed by Masoud Frounchi
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 294 KB
- Volume
- 64
- Category
- Article
- ISSN
- 0021-8995
No coin nor oath required. For personal study only.
β¦ Synopsis
The frequency master curves of thermoset and thermoplastic glassy polymers were determined by dynamic mechanical analysis, and the results were simulated by sinusoidal response of the standard viscoelastic model. The elastic and viscous elements of the model were determined and correlated with structure of glassy polymers. The advantage of this viscoelastic approach in toughening studies of polymers was discussed.
π SIMILAR VOLUMES
## Abstract Constitutive equations are derived for the nonlinear viscoelastic behavior of amorphous glassy polymers. The model is based on the theory of cooperative relaxation in a version of the trapping concept. Stressβstrain relations are applied to fit experimental data for polycarbonate in the
## Abstract The modification of the BlakeβKozeny equation for porous media flow using the power law has been shown to hold for molten polymers as well as for the previous cases for polymer solutions. The present work extended the correlation of friction factor with Reynolds number an additional thr