Fracture characteristics of PEEK at various stress triaxialities

Chen, Fei; Gatea, Shakir; Ou, Hengan; Lu, Bin; Long, Hu

Abstract

Polyether-ether-ketone (PEEK) is an alternative to metal alloys in orthopaedic applications. It gives significant advantages including excellent mechanical properties and non-toxicity. In this work, a set of specimens with different notched radii were selected to examine the effect of triaxial state of stress on the fracture behavior of PEEK. Fractographic analysis via scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) further elucidated the fracture micromechanisms. Distinct fracture patterns were identified under different stress triaxialities. In addition, the microstructural inclusion properties in PEEK specimen such as inclusion size and chemical composition were analysed and determined. Finite element simulations were carried out to evaluate the correlation of observed fracture characteristics with different stress triaxialities.

Citation

Chen, F., Gatea, S., Ou, H., Lu, B., & Long, H. (2016). Fracture characteristics of PEEK at various stress triaxialities. Journal of the Mechanical Behavior of Biomedical Materials, 64, 173-186. https://doi.org/10.1016/j.jmbbm.2016.07.027

• Journal Article Type: Article
• Acceptance Date: Jul 21, 2016
• Online Publication Date: Jul 30, 2016
• Publication Date: Dec 1, 2016
• Deposit Date: Aug 11, 2016
• Publicly Available Date: Aug 11, 2016
• Journal: Journal of the Mechanical Behavior of Biomedical Materials
• Print ISSN: 1751-6161
• Electronic ISSN: 1878-0180
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 64
• Pages: 173-186
• DOI: https://doi.org/10.1016/j.jmbbm.2016.07.027
• Keywords: PEEK; Stress triaxiality; Fracture; Finite element analysis
• Public URL: https://nottingham-repository.worktribe.com/output/825273
• Publisher URL: http://www.sciencedirect.com/science/article/pii/S1751616116302430
• Additional Information: This article is maintained by: Elsevier; Article Title: Fracture characteristics of PEEK at various stress triaxialities; Journal Title: Journal of the Mechanical Behavior of Biomedical Materials; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.jmbbm.2016.07.027; Content Type: article; Copyright: © 2016 The Authors. Published by Elsevier Ltd.
• Contract Date: Aug 11, 2016