Physical Aging in Glasses and Composites

Chapter

Abstract

Physical aging is observed in all glassy materials because of the fact that they are out of equilibrium. The ways in which aging manifests itself are the results of the thermal history of the materials, the environment, and even the constraint of, e.g., fibers or particles. In the present chapter, the fundamentals of aging of glasses are summarized by considering first structural recovery, which is the kinetics of the thermodynamic-type variables such as volume or enthalpy, and its impact on the mechanical response, which is the physical aging. Linear viscoelastic and nonlinear viscoelastic properties as well as yield behaviors will be considered. Furthermore, we will consider environmental effects on physical aging behaviors. The work will end with a perspective on aging in composites and where further research is needed.

Keywords

Permeability Entropy Fatigue Anisotropy Enthalpy 

Notes

Acknowledgments

The author is grateful for the generous support of the National Science Foundation under grant DMR-0804438, the Office of Naval Research under project number N00014-06-1-0922, and the John R. Bradford Endowment at Texas Tech University for partial support of this work. He is also thankful to Arts et Métiers ParisTech in Paris, France for partial support of the work during the summer of 2009. The author is also grateful to Ben Xu for help in creating figures.

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© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.Department of Chemical EngineeringTexas Tech UniversityLubbockUSA
  2. 2.Procédés et Ingénierie en Mécanique et Matériaux (UMR CNRS 8006)Arts et Métiers ParisTechParisFrance

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