Critical evaluation on structural stiffness of porous cellular structure of cobalt chromium alloy

In order to improve the stiffness characteristics of orthopedic devices implants that mimic the mechanical behavior of bone need to be considered. With the capability of Additive layer manufacturing processes to produce orthopedic implants with tailored mechanical properties are needed. This paper d...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2015-12, Vol.100 (1), p.12019
Main Authors: Abd Malek, N M S, Mohamed, S R, Che Ghani, S A, Wan Harun, W S
Format: Article
Language:English
Subjects:
Cellular structure
Chromium base alloys
Cobalt
Cobalt base alloys
Compression tests
Finite element method
Intermetallic compounds
Laser sintering
Mathematical analysis
Mathematical models
Mechanical properties
Modulus of elasticity
Numerical analysis
Orthopaedic implants
Orthopedics
Porosity
Prostheses
Sintering (powder metallurgy)
Stiffness
Stress-strain curves
Surgical implants
Transplants & implants
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Summary:In order to improve the stiffness characteristics of orthopedic devices implants that mimic the mechanical behavior of bone need to be considered. With the capability of Additive layer manufacturing processes to produce orthopedic implants with tailored mechanical properties are needed. This paper discusses finite element (FE) analysis and mechanical characterization of porous medical grade cobalt chromium (CoCr) alloy in cubical structures with volume based porosity ranging between 60% to 80% produced using direct metal laser sintering (DMLS) process. ANSYS 14.0 FE modelling software was used to predict the effective elastic modulus of the samples and comparisons were made with the experimental data. The effective mechanical properties of porous samples that were determined by uniaxial compression testing show exponential decreasing trend with the increase in porosity. Finite element model shows good agreement with experimentally obtained stress-strain curve in the elastic regions. The models prove that numerical analysis of actual prosthesis implant can be computed particularly in load bearing condition
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/100/1/012019