Fracture characteristics of PEEK at various stress triaxialities

Chen, Fei; Gatea, Shakir; Ou, Hengan; Lü, Bin; Long, Hui

doi:10.1016/j.jmbbm.2016.07.027

Cited by 34 publications

(22 citation statements)

References 27 publications

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“…Therefore, the influence of a physiological environment on the mechanical stability of PEEK is more requesting [4]. In addition, PEEK is a thermoplastic which is considered as a high-performance biomaterial [5].…”

Section: Introductionmentioning

confidence: 99%

Influence of loading conditions on the overall mechanical behavior of polyether-ether-ketone (PEEK)

Abbasnezhad

Khavandi

Fitoussi

et al. 2018

International Journal of Fatigue

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Testing methods have been developed to compare the mechanical responses and failure behavior of polyetherether-keton (PEEK) thermoplastic polymer; under quasi-static, high strain rate tensile tests and fatigue loading. Tensile tests were performed with the strain rates varying from 0.0003 s −1 to 60 s −1 and at different temperatures to compare the flow characteristics of the samples undergone various testing conditions. Fatigue tests at different amplitudes and frequencies were also performed to evaluate the temperature rise during cyclic loading and its effect on the fracture behavior. Results show that dynamic tension, in comparison with quasistatic behavior, causes brittle fracture; whereas under fatigue test at high frequencies and loading amplitudes the material behaves not only a more ductile behavior but also it clearly shows the influences of induced self-heating in the modulus and mechanical properties of the PEEK were significant. So the major aim of this article is to discuss about the induced temperature and its effect on the fracture surface. Thermal fatigue has a very significant role in increasing temperature and reducing fatigue life; from there it is necessary to know the conditions at which thermal fatigue happens and also the amount of energy which is consumed. Obtained equation from the experimental results and calculations can estimate the energy dissipation in the fatigue tests which is as a function of cycle and frequency.

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Section: Introductionmentioning

confidence: 99%

Influence of loading conditions on the overall mechanical behavior of polyether-ether-ketone (PEEK)

Abbasnezhad

Khavandi

Fitoussi

et al. 2018

International Journal of Fatigue

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“… Postoperative hematologic examination. Ten goats were followed up within 11 weeks and five goats were followed up within 23 weeks. WBC, white blood cell; HGB, hemoglobin; RBC, red blood cell; TP, total protein; ALB, albumin; GLOB, globulin; AST, glutamic‐oxaloacetic transaminase; CREA, creatinine; Ca, calcium; P, phosphorus.…”

Section: Resultsmentioning

confidence: 99%

Feasibility and Safety of a Cemented PEEK‐on‐PE Knee Replacement in a Goat Model: A Preliminary Study

Zhu²,

Yue

et al. 2018

Artificial Organs

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Polyether-ether-ketone (PEEK) is a potential alternative to metal alloys for use in the orthopedic implants; however, an in vivo study in an appropriate animal model is essential and has not yet been initiated. The aim of the present study was to gather some preliminary evidence regarding the performance and safety of a cemented PEEK-based knee replacement device in a goat model. Fifteen adult goats were randomly divided into two groups; the control group (n = 5), which received a sham operation, and the experimental group (n = 10), which received a total knee arthroplasty with a PEEK-based knee replacement device. The animals were sacrificed at 12 (control n = 5; experimental n = 5) or 24 weeks (experimental n = 5). Blood parameter measurements and radiographs of the knee joints were obtained. The synovium and main organs were removed and histologically assessed. The knee joints with the prosthesis were analyzed via micro-computed tomography and laser confocal microscopy. There was no occurrence of implant fracture or prosthesis sinking during the 24 weeks of radiological observations, except for one case of prosthesis dislocation at 4 weeks. There was a 6% decrease in femoral bone density (BD) at 12 weeks, but no further decrease by 24 weeks. No changes in BD were observed in the tibial ends. The bulk implant was biocompatible in terms of histological analysis of the local synovium and organs. There were no optical scratches on the surface of the retrieved components; the femoral component surface was rougher, while the tibial insert was smoother after 24 weeks. The novel PEEK-based knee replacement device in a goat model was feasible and safe; however, prior to use in humans, further studies concerning PEEK high load-bearing implant designs should be carried out to expand on our results.

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“…Despite their importance for dimensioning against failure, a lack of knowledge exists for assessing the notch sensitivity of PEEK. To the best of authors’ knowledge, only Sobieraj et al [ 10 ] and Chen et al [ 11 ] assessed notch effects on tensile strength of this semi-crystalline polymer. Sobieraj investigated the static behavior of un-notched and notched PEEK in corrosive environment at two different strain rates (0.1 and 0.5 s −1 ), whereas Chen explored the fracture behavior of four different axisymmetric notched specimens.…”

Section: Introductionmentioning

confidence: 99%

Fracture Assessment of PEEK under Static Loading by Means of the Local Strain Energy Density

et al. 2017

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Polyetheretherketone (PEEK) has gained interest in many industrial applications due to its high strength-to-weight ratio, excellent heat tolerance and high corrosion resistance. Stress concentrators such as notches and geometrical discontinuities are present in many such components necessitating the reliable assessment of notch sensitivity of PEEK in monotonic tension. Here we evaluate the applicability of the strain energy density (SED) approach for the assessment of the fracture strength of experimentally tested notched geometries subject to corrosion. The fracture behavior of neat, circumferentially razor-grooved dog-bone specimens and circumferentially U-notched specimens with different notch radii can be predicted with a discrepancy lower than ±10%. Reliable predictions are shown on two previously published datasets employing both computed and published mechanical properties as inputs for the SED calculations. This report presents the first successful application of SED for PEEK as well as the successful prediction of tensile behavior in corrosive environments. This opens the road towards future applications of PEEK in fields its compliant use is of growing popularity.

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Fracture characteristics of PEEK at various stress triaxialities

Cited by 34 publications

References 27 publications

Influence of loading conditions on the overall mechanical behavior of polyether-ether-ketone (PEEK)

Influence of loading conditions on the overall mechanical behavior of polyether-ether-ketone (PEEK)

Feasibility and Safety of a Cemented PEEK‐on‐PE Knee Replacement in a Goat Model: A Preliminary Study

Fracture Assessment of PEEK under Static Loading by Means of the Local Strain Energy Density

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