Stress analysis in bone scaffold geometries under compression loads with the mechanical properties of a Hydroxyapatite/lactic acid material
DOI:
https://doi.org/10.21640/ns.v15i30.3179Keywords:
bone geometry, HAp, bone injert, scaffolding simulation, biomechanics, human bone, resistence, compression, elastic modulus, cubic modelAbstract
The relationship between the strength of the material and the geometry of bone scaffolds ensures that the scaffold pores remain intact while bone cells develop through them. In this study, mechanical simulations of two geometries of bone scaffolds are presented using the mechanical properties of Hydroxyapatite (HAp) mixed with lactic acid. First, compression tests were performed on the HAp to determine its mechanical properties. Then, two geometries of bone scaffolds were modeled based on the porosity and size suitable for cell regeneration as reported in the literature, and the mechanical properties values were used for FEM simulations. The elastic modulus of 253.4 MPa, yield stress of 7.53 MPa, and Poisson's ratio of 0.33 were found. The porosities calculated for the cubic and cylindrical CAD models are 43.83% and 50.51%, respectively. It was found that the cubic model supported a force of 21 N in versus the cylindrical model, which supported a force of 19 N; these forces were applied in the simulations not to exceed the maximum permissible stress of 4.5 MPa of the HAp.
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