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Polymeric materials exhibit time‐dependent behavior for the understanding of which linear viscoelasticity theory provides the simplest model. In this class of materials, the deformation can continue to change even under a constant load. This chapter focuses on phenomenological aspects of the time‐dependent behavior of polymeric materials. In polymer materials discussions, the time and temperature dependence is introduced by considering how properties vary with time at a fixed temperature and with temperature at a fixed time. Experiments on a wide range of plastics have shown that they exhibit a time‐temperature equivalence that collapses data onto a single, master modulus‐time curve at a reference temperature from which the moduli at any other temperature can easily be obtained. The characterization of this experimental behavior is referred to as time‐temperature superposition. The chapter provides information on sinusoidal oscillatory tests where the test specimen is subjected to a sinusoidally varying load.
Polymeric materials exhibit time‐dependent behavior for the understanding of which linear viscoelasticity theory provides the simplest model. In this class of materials, the deformation can continue to change even under a constant load. This chapter focuses on phenomenological aspects of the time‐dependent behavior of polymeric materials. In polymer materials discussions, the time and temperature dependence is introduced by considering how properties vary with time at a fixed temperature and with temperature at a fixed time. Experiments on a wide range of plastics have shown that they exhibit a time‐temperature equivalence that collapses data onto a single, master modulus‐time curve at a reference temperature from which the moduli at any other temperature can easily be obtained. The characterization of this experimental behavior is referred to as time‐temperature superposition. The chapter provides information on sinusoidal oscillatory tests where the test specimen is subjected to a sinusoidally varying load.
Polymer Viscoelasticity
Stokes, Vijay K. (author)
Introduction to Plastics Engineering ; 313-329
2020-05-11
17 pages
Article/Chapter (Book)
Electronic Resource
English
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