Danilo Bruson
Design and mechanical characterization of lightweight polymeric structures for additive manufacturing production.
Rel. Luca Iuliano, Manuela Galati, Flaviana Calignano. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Meccanica, 2022
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Abstract
Along two decades, wide research has been carried out within characterisation of the mechanical properties of cellular or lattice structures made by additive manufacturing. Being one of the most complex geometries, lattice structures have been extensively studied in compression conditions. However, tensile characterization is rarely addressed because of the difficulties related to the definition of a suitable design for. The present study aims to expand the knowledge about these structures produced with polymeric powders, evaluating their tensile behaviour. Two different face and body centred lattice topologies with different strut diameters are investigated. The specimen is designed integrating the UNI EN ISO 527 – 1 standard guidelines with a lattice-suited graded geometry pattern optimization of the load introduction portion from the full solid bulk clamping extremities to the central lattice within the strain gauge length.
Specific samples are designed and manufactured via selective laser sintering technology (SLS) with Nylon PA12 powder along two different building orientations evaluating the anisotropic and the defects correlated influences on the exhibited mechanical performances
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