Finite element analysis and performance research of laser selective melting forming porous scaffolds
The aging of the population has intensified the demand for metallic implants,and the widely used solid stents cannot meet the requirements of long-term patient use due to the"stress barrier"phe-nomenon.In this paper,finite element numerical simulations of stent models with different pore sizes and porosities were performed,and it was analyzed that the porosity is the main factor affecting the me-chanical properties,and the modulus of elasticity decreases significantly with the increase of the porosity.Selective laser melting technology is used to prepare porous scaffolds with different porosities to study the porous characteristics of different porosities and their properties,and the hardness test results show that selective laser melting technology can realize the uniform melting of solid scaffolds.When the porosity of the porous scaffolds was in the range of 60％to 84％,the hardness of all of them could meet the standard of human bone.After heat treatment,the hardness of the porous scaffolds was in-creased,which in turn enhanced their suitability as load-bearing structures at the human implantation site.The results of the compression tests further showed that the prepared porous stainless steel speci-mens exhibited some typical properties of porous materials during compression.After comparison,the scaffold with a pore size of 700 μ m and a porosity of 84％achieves a high degree of fit with human bone in terms of comprehensive mechanical properties.
Selective laser meltingFinite element numerical simulationPorous scaffoldMechanical properties
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