title: Fracture characteristics of PEEK at various stress triaxialities.
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.
authors: Department of Mechanical, Materials and Manufacturing Engineering, University of Nottingham, Nottingham NG7 2RD, UK.
authors: Fei
authors: F
authors: Chen
authors: Department of Mechanical, Materials and Manufacturing Engineering, University of Nottingham, Nottingham NG7 2RD, UK.
authors: Shakir
authors: S
authors: Gatea
authors: Department of Mechanical, Materials and Manufacturing Engineering, University of Nottingham, Nottingham NG7 2RD, UK. Electronic address: H.Ou@nottingham.ac.uk.
authors: Hengan
authors: H
authors: Ou
authors: Institute of Forming Technology and Equipment, Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai 200030, PR China; Department of Mechanical Engineering, University of Sheffield, Sheffield S1 3JD, UK.
authors: Bin
authors: B
authors: Lu
authors: Department of Mechanical Engineering, University of Sheffield, Sheffield S1 3JD, UK.
authors: Hui
authors: H
authors: Long
mesh_terms: D000497:Alloys; D001577:Benzophenones; D020342:Finite Element Analysis; D007659:Ketones / Q000737:chemistry*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D011092:Polyethylene Glycols / Q000737:chemistry*; D011108:Polymers; D013052:Spectrometry, X-Ray Emission; D013314:Stress, Mechanical
chemical_list: D000497:Alloys; D001577:Benzophenones; D007659:Ketones; D011108:Polymers; C063834:polyetheretherketone; D011092:Polyethylene Glycols
keywords: Finite element analysis; Fracture; PEEK; Stress triaxiality