Naghavi, Seyed;
Tamaddon, Maryam;
Hejazi, Mahbubeh;
Moazen, Mehran;
Liu, Chaozong;
(2022)
On the mechanical aspect of additive manufactured polyether-ether-ketone scaffold for repair of large bone defects.
Biomaterials Translational
, 3
(2)
pp. 142-151.
10.12336/biomatertransl.2022.02.006.
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On the mechanical aspect of additive manufactured polyether-ether-ketone scaffold for repair of large bone defects.pdf - Published Version Download (3MB) | Preview |
Abstract
Polyether-ether-ketone (PEEK) is widely used in producing prosthesis and have gained great attention for repair of large bone defect in recent years with the development of additive manufacturing. This is due to its excellent biocompatibility, good heat and chemical stability and similar mechanical properties which mimics natural bone. In this study, three replicates of rectilinear scaffolds were designed for compression, tension, three-point bending and torsion test with unit cell size of 0.8 mm, a pore size of 0.4 mm, strut thickness of 0.4 mm and nominal porosity of 50%. Stress-strain graphs were developed from experimental and finite element analysis models. Experimental Young’s modulus and yield strength of the scaffolds were measured from the slop of the stress-strain graph to be 395 and 19.50 MPa respectively for compression, 427 and 6.96 MPa respectively for tension, 257 and 25.30 MPa respectively for three-point bending and 231 and 12.83 MPa respectively for torsion test. The finite element model was found to be in good agreement with the experimental results. Ductile fracture of the struct subjected to tensile strain was the main failure mode of the PEEK scaffold, which stems from the low crystallinity of additive manufacturing PEEK. The mechanical properties of porous PEEK are close to those of cancellous bone and thus are expected to be used in additive manufacturing PEEK bone implants in the future, but the lower yield strength poses a design challenge.
| Type: | Article |
|---|---|
| Title: | On the mechanical aspect of additive manufactured polyether-ether-ketone scaffold for repair of large bone defects |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.12336/biomatertransl.2022.02.006 |
| Publisher version: | http://doi.org/10.12336/ biomatertransl.2022.02.00... |
| Language: | English |
| Additional information: | This is an open access journal, and articles are distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as appropriate credit is given and the new creations are licensed under the identical terms. |
| Keywords: | Additive manufacturing ; bone scaffold ; finite element analysis ; mechanical behaviour ; lattice structure ; PEEK scaffold |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10151170 |
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