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9 - Time Dependent Behavior

Published online by Cambridge University Press:  15 September 2022

Catalin R. Picu
Catalin R. Picu
Affiliation:
Rensselaer Polytechnic Institute, New York
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Summary

Many Network materials exhibit time-dependent behavior. This chapter begins with a review of essential results from viscoelasticity. Further, the mechanisms leading to network scale time dependence are analyzed in three separate sections. The influence of the fiber material time dependence on the network behavior is discussed first. In networks embedded in a fluidic matrix, the migration of the fluid in and out of the network may produce time dependent mechanical behavior. The basic notions of poroelasticity are presented and the conditions under which this mechanism becomes important for the network-scale mechanics are outlined. Time dependence is also produced by nonbonded fiber interactions. This is an essential component of the mechanics of thermal molecular networks and a section is devoted to this topic. In networks in which crosslinks are transient, such as ionomers and vitrimers, material behavior is strongly time dependent, and a section is dedicated to this issue. Multiple mechanisms act concurrently in applications and identifying their individual contributions is not always easy. A discussion aimed to assist the interpretation of experimental data is included.

Keywords

viscoelasticityporoelasticitystrain rate sensitivityinternal frictiondissipationtime–temperature superpositiontransient crosslinksrelaxation mechanisms
Type
Chapter
Information
Network Materials
Structure and Properties
 , pp. 338 - 369
Publisher: Cambridge University Press
Print publication year: 2022

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  • Time Dependent Behavior
  • Catalin R. Picu, Rensselaer Polytechnic Institute, New York
  • Book: Network Materials
  • Online publication: 15 September 2022
  • Chapter DOI: https://doi.org/10.1017/9781108779920.010
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  • Time Dependent Behavior
  • Catalin R. Picu, Rensselaer Polytechnic Institute, New York
  • Book: Network Materials
  • Online publication: 15 September 2022
  • Chapter DOI: https://doi.org/10.1017/9781108779920.010
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  • Time Dependent Behavior
  • Catalin R. Picu, Rensselaer Polytechnic Institute, New York
  • Book: Network Materials
  • Online publication: 15 September 2022
  • Chapter DOI: https://doi.org/10.1017/9781108779920.010
Available formats
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