Paper number 430
|FATIGUE PROPERTIES OF CF/PEEK CORTICAL BONE SCREWS PRODUCED BY COMPOSITE TRANSFER SQUEEZE FORMING (CTSF)|
Tognini R.1, Loher U.2, Peter Th.1, Raschle R., Mayer J.1, Wintermantel E.1
1Biocompatible Materials Science and Engineering
Swiss Federal Institute of Technology, ETH Zürich, 8952 Schlieren, Switzerland
2EMPA (Swiss Federal Laboratories for Materials Testing and Research); Dübendorf, Switzerland
|Summary||The Composite Transfer Squeeze Forming (CTSF) [10, pp.109-112] allows the processing of high volume fraction composites with thermoplastic matrix. Cortical bone screws (CTSF-3.0) and specially designed screws with a rod-like design (CTSF-3.5) have shown promising mechanical properties. The 3-point bending strength of a 3.0 mm core diameter CTSF-3.0 screw is 700 MPa compared to 900 MPa (F 0.02) for a similar screw made out of commercially pure titanium. For fatigue, the CTSF-screws have shown better performance than Titanium screws, being much less notch sensitive. Compared at 500'000 cycles, Titanium screws achieved approx. 12%, CTSF-3.0 60% and CTSF-3.5 90% of the static load.
||Keywords|| net-shape processing, composite transfer squeeze forming (CTSF), fastener, screw, PEEK, carbon fibre, implant, translaminar screw fixation.
Theme : Processing, Integrated Design and Manufacturing ; Near-net Shape
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