A Thermodynamic Approach to Long-Term Deformation and Damage for Polymeric Materials in Hygrothermal Environment |
| Journal |
Key Engineering Materials (Volume 312) |
| Volume |
Fracture of Materials: Moving Forwards |
| Edited by |
Hong-Yuan Liu, Xiaozhi Hu and Mark Hoffman |
| Pages |
21-26 |
| DOI |
10.4028/www.scientific.net/KEM.312.21 |
| Online since |
June, 2006 |
| Authors |
Xiao Hong Chen,
Su Su Wang
|
| Keywords |
Coupled Model, Damage, Deformation, Diffusion, Heat Transfer, Hygrothermal Environment, Long Term, Polymeric Materials, Thermodynamic |
| Abstract |
In this paper, a thermodynamic approach is presented to model coupled fluid transport, heat transfer, long-term deformation and damage in polymeric materials. The well-known Gibbs free energy is expressed as a functional of stress, temperature and fluid concentration with damage being introduced as an internal state variable. Constitutive equations for nonlinear viscoelastic
materials in hygrothermal environments are derived in memory functional forms. The kinetics of damage evolution induced by stress, temperature and fluid is described by a damage function with thermodynamic driving force. Governing equations for mass and heat transfer are obtained from transport laws relating fluid and heat fluxes to gradients of chemical potential difference and temperature. A superposition principle of time, temperature, fluid concentration, stress, and aging is
proposed so that long-term property functions may be derived from momentary master curves by horizontal and vertical shifting. The approach provides a theoretical framework for evaluating longterm behavior of polymeric materials in hygrothermal environments from short-term experiments. |
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