Browsing by Author "Freitas, Dino"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
- Evaluation of the structural strength of anisotropic PLA components manufactured by 3D printingPublication . Ramalho, Armando; Freitas, Dino; Almeida, HenriquePredicting the mechanical strength of components manufactured by additive processes is a challenging task that is difficulted by the complexity of the geometries fabricated by these processes, along with the anisotropy enhanced by the layer-by-layer manufacturing method and the difficulty in quickly obtaining the elastic and strength properties of the materials, which are strongly influenced by the manufacturing parameters. The use of 3D CAD models in the design phase of components manufactured by 3D printing facilitates the use of the finite element method in assessing their strength and simulating their in-service behavior. However, the finite element analysis of 3D printed parts using anisotropic material behaviour are rare and restricted to simple geometries. To deal with the anisotropy of materials, intense research has been carried out for the last decades in the field of evaluating the mechanical strength of composite materials, introducing several specific failure criteria. In this article, the in-service behaviour of PLA components manufactured by 3D printing is simulated, applying criteria usually used in the study of composite materials to evaluate their mechanical strength. The simulation through the finite element method was developed on the Hexagon Marc/Mentat software, using the Maximum Stress and Hoffman failure criteria.
- The anisotropy and friction effect in the design of 3D printed PLA parts – A case studyPublication . Ramalho, Armando; Freitas, Dino; Almeida, HenriqueAdditive Manufacturing, commonly known as 3D Printing, is one of the most affordable manufacturing processes for producing complex geometric components. This manufacturing process is also frequently used when it is needed to manufacture unique parts to replace degraded or damaged components and spare parts that are no longer available. In this reverse engineering process, particular attention must be given to the constitutive models of materials. The 3D printing manufacturing process usually requires a change of materials and introduces or increases the anisotropy. In addition, the complexity of part geometries and loading often requires using the finite element method to simulate their behaviour in service. Polylactic acid (PLA) is one of the materials frequently used in 3D Printing for its sustainability, affordability, and mechanical and thermal properties. In this study, a bushing of a hinged drawer support is reverseengineered, and its in-service behaviour is simulated before it is manufactured using Tough PLA material through 3D printing. Furthermore, the effect of the anisotropy and the friction in the design is evaluated. The MSC Patran/Nastran 2021 software for the finite element analysis, the Ultimaker Cura 5.0 software and the Ultimaker S5 printer were used.