Percorrer por autor "Stein, Felipe Y.M."
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- Extraction of natural fibers for the manufacture of 3D filaments by FDM material extrusionPublication . Stein, Felipe Y.M.; Rocha, João; Santos, Jorge; Ribeiro, J.E.; Deusdado, Leonel; Catarina RochaThe study aimed to extract hemp fibers for the NaturFab project, in order to mechanically strengthen PLA in filaments for 3D printing. In order to find the best extraction method, several chemical treatments were carried out to separate the fibers from the plant, using solutions of 2 g/l of sodium hydroxide (NaOH) + 2 g/l of sodium carbonate (NaCO₃) and another solution of 6% NaOH, both at 80 ºC. After obtaining the first fiber sample, tensile tests were carried out to compare the strength of the hemp fibers with those of commercial flax. Hemp showed inferior performance compared to flax fibers, with a more fragile behavior after treatment with 6% NaOH. However, a solution of NaOH and NaCO₃ with polyglycolic detergent facilitated extraction and improved fiber strength, but further tests should be carried out to verify its effectiveness.
- Extraction of natural fibers for the manufacture of 3D filaments by FDM material extrusionPublication . Stein, Felipe Y.M.; Rocha, João; Santos, Jorge; Ribeiro, J.E.; Deusdado, Leonel; Rocha, CatarinaThe study aimed to extract hemp fibers for the NaturFab project, in order to mechanically strengthen PLA in filaments for 3D printing. In order to find the best extraction method, several chemical treatments were carried out to separate the fibers from the plant, using solutions of 2 g/l of sodium hydroxide (NaOH) + 2 g/l of sodium carbonate (NaCO₃) and another solution of 6% NaOH, both at 80 ºC. After obtaining the first fiber sample, tensile tests were carried out to compare the strength of the hemp fibers with those of commercial flax. Hemp showed inferior performance compared to flax fibers, with a more fragile behavior after treatment with 6% NaOH. However, a solution of NaOH and NaCO₃ with polyglycolic detergent facilitated extraction and improved fiber strength, but further tests should be carried out to verify its effectiveness.
- Mechanical analysis of specimens generated by 3D topological optimizationPublication . Stein, Felipe Y.M.; Rocha, João; Araújo, M.; Santos, JorgeThis study investigates the use of topologically optimized filling in additive manufacturing to enhance the strength-to-mass ratio of 3D printed parts. The research utilized SolidWorks modeling, adhering to the ASTM 695-15 standard, with optimization focused on various symmetries and preserved regions to maximize structural efficiency. The specimens were printed using Anycubic Kobra 2 Neo 3D printers and ABS filament, and the optimized models were compared to those with standard fillings (grid and triangular) through compression testing. The results showed that while the optimized filling achieved only 50% of the strength of the standard- filled models, the grid pattern outperformed the others, demonstrating superior performance and ductility. Ultimately, the study concluded that the optimization process did not surpass the performance of the standard meshes generated by 3D printing slicers.