Dissertação
Anteprojeto de uma prótese passiva de pé fabricada por manufatura aditiva
Fecha
2022-07-08Autor
Leonardo Pessoa Linhares Oliveira
Institución
Resumen
Additive manufacturing is a widely used manufacturing process for the production of some
mechanical components, including biotechnologies. The piece can be made up of various
materials, including thermoplastics with different mechanical properties. Prostheses are an
example of a component that can be developed in this way, including passive foot prostheses.
To achieve the goal, four geometries were designed, which were altered to achieve the proposed
goal. The proposed geometries in this thesis have curvatures, with the function of cushioning
the impact during walking. When the load is applied to the top of the prosthesis, the curvatures
deform, like a spring, to cushion the impact. The models were simulated using Finite Elements
Model to analyze the responses they would provide after the application of loads. During each
simulation, the points that could be changed to increase displacement and provide stability for
the prosthesis were observed. The final model presented a deformation of 8,775 mm, which
represents a growth of 3.19x in relation to the deformation of the first model. In addition, the
PETG model presented a good margin of safety in the computational model, according to the
Tsai-Hill criterion. Only after several simulations, two geometries were prototyped, one in PLA
and one in PETG, to understand how each one behaves when the load is applied. Finally,
compression tests were performed, with the objective of discovering how the prototypes would
respond and comparing them to the computational models.