Back stress in modeling the response of PEEK and PC

Wenlong Li, George Gazonas, Eric N. Brown, Philip J. Rae, Mehrdad Negahban

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

With the development of new methods for the characterization of equilibrium stress through cyclic loading, it is now possible to follow the evolution of back stress during the nonlinear deformation of polymers. Experiments on PEEK and PC below the glass-transition temperature indicate a back stress that may evolve with plastic deformation, and which is substantially different from that seen during the response in the rubbery range. In particular, the back stress during the response of PC shows the characteristic post-yield softening, possibly indicating that the observed post-yield softening in the response comes from the back stress. This is not seen in PEEK, which also shows no substantial post-yield softening. The equilibrium stress plays a central role in modeling both the quasi-static and dynamic response of PEEK.

Original languageEnglish (US)
Title of host publicationChallenges in Mechanics of Time Dependent Materials- Proceedings of the 2016 Annual Conference on Experimental and Applied Mechanics
EditorsJevan Furmanski, H. Jerry Qi, Alex Arzoumanidis, Alireza Amirkhizi, Meredith Silberstein, Hongbing Lu, Bonnie Antoun
PublisherSpringer New York LLC
Pages181-186
Number of pages6
ISBN (Print)9783319415420
DOIs
Publication statusPublished - Jan 1 2017
EventAnnual Conference and Exposition on Experimental and Applied Mechanics, 2016 - Orlando, United States
Duration: Jun 6 2016Jun 9 2016

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
Volume2
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652

Other

OtherAnnual Conference and Exposition on Experimental and Applied Mechanics, 2016
CountryUnited States
CityOrlando
Period6/6/166/9/16

    Fingerprint

Keywords

  • Digital image correlation
  • Equilibrium stress
  • Mechanical modeling
  • Plastic flow
  • Thermal expansion

ASJC Scopus subject areas

  • Engineering(all)
  • Computational Mechanics
  • Mechanical Engineering

Cite this

Li, W., Gazonas, G., Brown, E. N., Rae, P. J., & Negahban, M. (2017). Back stress in modeling the response of PEEK and PC. In J. Furmanski, H. J. Qi, A. Arzoumanidis, A. Amirkhizi, M. Silberstein, H. Lu, & B. Antoun (Eds.), Challenges in Mechanics of Time Dependent Materials- Proceedings of the 2016 Annual Conference on Experimental and Applied Mechanics (pp. 181-186). (Conference Proceedings of the Society for Experimental Mechanics Series; Vol. 2). Springer New York LLC. https://doi.org/10.1007/978-3-319-41543-7_23