Development and validation of the mechanical behavior of a cervical disc implant with an "S" shape of Ti-6Al-4V ELI manufactured by SLM
DOI:
https://doi.org/10.14482/inde.38.1.620.5Keywords:
ASTM F136, ASTM 2346, 3d fatigue behavior, Cervical implant, 3d printing, Finite element analysis in 3d printing, ELI alloy, Ti6AL4VAbstract
In the present study is developed and validated the mechanical behavior of a titanium alloy cervical medical implant type Ti-6Al-4V ELI, manufactured by selective laser melting (SLM), which is a highly versatile and a faster process that allows to manufacture components with complex shapes. The medical implant developed in this research presents improvements compared to existing ones. The proposal of this research is the geometric design optimization set up as a "S" shape, by using finite elements analysis and the feedback the results of mechanical tests. Chemical analyzes, microstructural analyzes, mechanical tests and finite element analysis were carried out, taking as reference the guidelines established in the ASTM F136-13 and ASTM 2346-11 standards. During the development of this project, several geometric modifications were presented as a result of the constant feedback between the simulation of the design and the behavior of the implant under cyclic loads. Finally, the optimal design of the implant was found and this design achieves the functional requirements of a cervical implant.
References
I. Gibson, D. Rosen, & B. Stucker, Additive manufacturing technologies. Springer, 2010.
L. Y. Chen et al., «Anisotropic response of Ti-6Al-4V alloy fabricated by 3D printing selective laser meltin», Materials Science and Engineering, vol. 682, pp. 389-395, 2017.
L. Murr, S. Quiñones, S. Gaytan, & M. I. López, «Microstructure and mechanical behavior of Ti–6Al–4V produced by rapid layer manufacturing, for biomedical applications», Journal of the Mechanical Behavior of Biomedical Materials, vol. 2, n.o 1, pp. 20-32, 2009.
M.Benedettia, M.Cazzollia, V.Fontanaria, & M.Leonib, «Fatigue limit of Ti6Al4V alloy produced by selective laser sintering», Procedia Structural Integrity, vol. 2, pp. 3158-3167, 2016.
N. W. Hrabe, P. Heinl, B. Flinn, C. Körner, & R. K., «Compression-compression fatigue of selective electron beam melted cellular titanium (Ti-6Al-4V)», Society for Biomaterials, vol. 99, n.o 2, p. 313-320, 2011.
ASTM, «Standard specification for wrought titanium-6aluminum-4vanadium eli (extra low interstitial) alloy for surgical implant applications».
ASTM, «Standard test method for analysis of titanium and titanium alloys by spark atomic emission spectrometry and glow discharge atomic emission spectrometry (Performance-Based Method)».
ASTM, «Standard test methods for tension testing of metallic materials».
ASTM, «Standard test methods for bend testing of material for ductility».
ASTM, «Standard guide for preparation of metallographic specimens».
ASTM, «Standard practice for microetching metals and alloys».
ASTM, «Standard test methods for static and dynamic characterization of spinal artificial discs».
M. M. Panjabi et al., «Mechanical properties of the human cervical spine», Spine, vol. 26, n.o 24, pp. 2692-2700, 2001.
S. Hosseini, «Fatigue of Ti-6Al-4V», Intech, 2012.
ASTM, «Standard Test Methods for Rockwell Hardness of Metallic Materials»
