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Micro-Mechanical Model for Thermo-Oxidative Aging of Elastomers

[+] Author Affiliations
Hamid Mohammadi, Roozbeh Dargazany

Michigan State University, East Lansing, MI

Paper No. IMECE2018-88109, pp. V009T12A028; 10 pages
doi:10.1115/IMECE2018-88109
From:
  • ASME 2018 International Mechanical Engineering Congress and Exposition
  • Volume 9: Mechanics of Solids, Structures, and Fluids
  • Pittsburgh, Pennsylvania, USA, November 9–15, 2018
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5214-9
  • Copyright © 2018 by ASME

abstract

In this study, a micro-mechanical model for constitutive behavior of elastomers subjected to thermo-oxidative aging is proposed. The model is based on the network decomposition concept and lies within the framework of continuum mechanics. It is assumed that the aging process leads to the formation of a new network with tighter chains. Accordingly, the strain energy of the system is constituted of two independent sources, the energy of the original soft network and the one of the reformed network. These strain energies were computed by integration of entropic energy of polymer chains in each direction of a micro-sphere. The model demonstrates good agreement with different experimental data on relaxation and intermittent tests.

Copyright © 2018 by ASME
Topics: Elastomers

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