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Noteworthy in 2016: Material Model for PEEK under High Temperature Processing Conditions

    • Reference:
    • Chen F, Ou H, Lu B, Long H. A constitutive model of polyether-ether-ketone (PEEK). J Mech Behav Biomed Mater. 2016;53:427-33.
    • Keywords:
    • PEEK, modeling
    • Permissions:
    • This paper was published under Open Access. The PDF of the paper is available for download under the provisions of the Creative Commons license. The paper was officially published on the journal website (doi:10.1016/j.jmbbm.2015.08.037).

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Abstract

Researchers have developed a modified Johnson-Cook (JC) model to describe the flow behaviour of polyether-ether-ketone (PEEK) with the consideration of coupled effects of strain, strain rate and temperature. As compared to traditional JC model, the modified one has better ability to predict the flow behaviour at elevated temperature conditions that are encountered during polymer processing. In particular, the yield stress was found to be inversely proportional to temperature from the predictions of the proposed model.

 

LEXICON COMMENTARY

There is an increasing need for improved theoretical modeling of PEEK under complex loading conditions, and these certainly apply during thermal processing of the material. In this paper Chen and colleagues propose and validate a theoretical model to predict the mechanical behavior of PEEK during elevated temperatures that may be encountered during processing (approaching 480K). The bibliography contains a variety of papers that have looked at modeling PEEK at room temperature as well. This is an important step towards predicting the behavior of more complex PEEK composites.

 

Steve Kurtz, Ph.D.

Editor, Medical PEEK Lexicon