Journal
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
Volume 123, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jmbbm.2021.104784
Keywords
Porous structures; Functionally graded; Finite element analysis; Mechanical testing; Additive manufacturing
Funding
- Engineering and Physical Sciences Research Council [EP/R042721/1]
- Wellcome Trust [208858/Z/17/Z]
- Wellcome Trust [208858/Z/17/Z] Funding Source: Wellcome Trust
- EPSRC [EP/R042721/1] Funding Source: UKRI
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This study analyzed the compressive behavior of different types of functionally graded porous structures and found that radially and laterally porous graded structures outperformed uniform porous structures in terms of stiffness. A new FEA beam model was proposed for analyzing this type of structures.
Functionally graded porous structures (FGPSs) are gaining interest in the biomedical sector, specifically for orthopaedic implants. In this study, the compressive behaviour of seven different FGPSs comprised of Face Centred Cubic (FCC) and the Octet truss unit cells (OCT) were analysed. The porosity of the structures were graded in different directions (radially, longitudinally, laterally and longitudinally & radially) by varying the strut diameters or by combining the two types of unit cells. The structures were manufactured by laser power bed fusion and compression tests were performed. Radially and laterally porous graded structures were found to outperform uniform porous structures with an increase in stiffness of 13.7% and 21.1% respectively. The experimental and finite element analysis (FEA) results were in good agreement with differences in elastic modulus of 9.4% and yield strength of 15.8%. A new FEA beam model is proposed in this study to analyse this type of structures with accurate results and the consequent reduction of computational time. The accuracy of the Kelvin-Voight model and the rule of mixtures for predicting the mechanical behaviour of different FGPSs was also investigated. The results demonstrate the adequacy of the analytical models specifically for hybrid structures and for structures with smooth diameter transitions.
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