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Fatigue Modeling for Polyether Ether Ketone (PEEK) With Mean Strain Effects

[+] Author Affiliations
Rakish Shrestha, Jutima Simsiriwong, Nima Shamsaei

Mississippi State University, Mississippi State, MS

Paper No. IMECE2015-51659, pp. V009T12A025; 7 pages
  • ASME 2015 International Mechanical Engineering Congress and Exposition
  • Volume 9: Mechanics of Solids, Structures and Fluids
  • Houston, Texas, USA, November 13–19, 2015
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5752-6
  • Copyright © 2015 by ASME


In this study, the fatigue behavior of a polyether ether ketone (PEEK) polymer was investigated under uniaxial strain-controlled conditions with and without mean strain. Experimental study included a series of fully-reversed fatigue tests at five strain amplitudes (2%, 2.5%, 3%, 3.5%, and 4%) and fatigue tests at three mean strain values (2%, 2.5%, and 3%) at various frequencies. Stress responses of PEEK obtained from the tests under fully-reversed cyclic loading condition indicated a significant cyclic softening, while a stress relaxation was observed for the PEEK specimens under mean strain cyclic loading. Two different types of fatigue models, including a strain-based (Coffin-Manson) and energy-based, were employed to correlate fatigue life obtained from all experimental data. Among the two fatigue models, the fatigue life prediction using the energy-based approach was found to provide a better correlation to PEEK experimental data for both fully-reversed and mean strain conditions when compared to the Coffin-Manson model.

Copyright © 2015 by ASME



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