![]() propagation, and it was found that the specimens spent the majority of the time in the crack initiation phase.Ĭopyright © 2010 Elsevier Ltd. Additional analysis was conducted to estimate the percent of the lifetime spent in crack initiation vs. The effect of machining conditions on the rolling contact fatigue (RCF) strength of PEEK polymer bearings was investigated. Fractographic analysis via SEM further elucidated the potential fracture micromechanisms. The melting temperature of PEEK is 343 C, and the T g is 143 C 16, which is. No significant change in tensile properties was observed, but a decrease of 25 in fatigue strength was observed. Polyether-ether-ketone (PEEK) is a special engineering plastic and also has a certain shape memory effect. It was found that the majority of the loading was elastic in nature, and that there was only a small portion on the lifetime where there was a detectable change in structural behavior prior to gross fracture. Bioengineering 2017, 5, 18 2 of 10 of carbon/PEEK laminates were also studied 16. However, it should be noted that surface porous PEEK demonstrated better fatigue strength than the other commonly used load-bearing orthopedic polymer, PMMA (Fig. This work examines both stress-life (S-N) fatigue behavior and the fracture behavior of unfilled PEEK under tension-tension loading in circumferentially grooved round bar specimens with different elastic stress concentration factors. Several fatigue models, including a strain-based, a strain-stress-based, and an energy-based, are employed to correct for the effect of mean strain and stress on fatigue behavior of PEEK. Overall, under cyclic loading conditions, PEEK-SP was found to have a lower fatigue strength than PEEK-IM. VESTAKEEP PEEK - YOUR NEXT GENERATION MATERIAL FOR MEDICAL IMPLANTS excellent biocompatability resistance to all common used sterilization methods high. All of the orthopaedic applications contain stress concentrations (notches) in their design however, little work has been done to examine the fatigue behavior of PEEK in the presence of a notch. ![]() Poly(ether-ether-ketone) (PEEK) has been used as a load bearing orthopaedic implant material with clinical success. ![]()
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