Journal
BIO-MEDICAL MATERIALS AND ENGINEERING
Volume 23, Issue 5, Pages 433-445Publisher
IOS PRESS
DOI: 10.3233/BME-130765
Keywords
Topology optimization; selective laser melting (SLM); titanium implants materials; finite element analysis
Funding
- National Natural Science Foundation of China [51275179]
- Combination Program of Ministry of Education, Ministry of Science and Technology and Guangdong Province, China [2010A090200072]
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The load-bearing bone implants materials should have sufficient stiffness and large porosity, which are interacted since larger porosity causes lower mechanical properties. This paper is to seek the maximum stiffness architecture with the constraint of specific volume fraction by topology optimization approach, that is, maximum porosity can be achieved with predefine stiffness properties. The effective elastic modulus of conventional cubic and topology optimized scaffolds were calculated using finite element analysis (FEA) method; also, some specimens with different porosities of 41.1%, 50.3%, 60.2% and 70.7% respectively were fabricated by Selective Laser Melting (SLM) process and were tested by compression test. Results showed that the computational effective elastic modulus of optimized scaffolds was approximately 13% higher than cubic scaffolds, the experimental stiffness values were reduced by 76% than the computational ones. The combination of topology optimization approach and SLM process would be available for development of titanium implants materials in consideration of both porosity and mechanical stiffness.
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