Percorrer por autor "Freitas, Dino"
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- Evaluation of the structural strength of anisotropic PLA components manufactured by 3D printingPublication . Ramalho, Armando; Freitas, Dino; Amorim 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.
- International Conference on Progress in Digital and Physical Manufacturing ProDPM'19 - Book of AbstractsPublication . Almeida, Henrique; Vasco, Joel; Marto, Anabela; Capela, Carlos; Freitas, Dino; Craveiro, Flávio; Bártolo, Helena; Coelho, Luís; Correia, Mário; Vieira, Milena; Ruben, RuiThe “Progress in Digital and Physical Manufacturing” book contains keynotes and papers presented at the first International Conference on Progress in Digital and Physical Manufacturing (ProDPM'19), organized by the School of Technology and Management (ESTG) of the Polytechnic Institute of Leiria (IPLeiria), from the 2nd to the 4th of October 2019. This international conference aims to provide a major international forum for the scientific exchange of multi-disciplinary and inter-organisational aspects performed by academics, researchers and industrial partners in order to exchange ideas in the field of digital and physical manufacturing and related areas. It represents a significant contribution to the current advances in industrial digital and physical manufacturing issues as it contains topical research in this field. The ProDPM'19 conference expects to foster networking and collaboration among participants to advance the knowledge and identify major trends in the field. The conference addresses to industrial challenges focused on current market demands and actual technological trends, such as mass customization, new business and industrial models or predictive engineering. Its contribution in science and technology developments leads to more suitable, effective and efficient products, materials and processes, generating added-value for the Industry and promoting the awareness of the role and importance of the digital and physical manufacturing development in the society. This book is, therefore, an essential reading for all of those working on digital and physical manufacturing, promoting better links between the academia and the industry. The conference papers will cover a wide range of important topics like additive manufacturing, biomanufacturing, advanced and smart manufacturing technologies, rapid tooling, microfabrication, virtual environments, simulation and 3D CAD and data acquisition, materials and collaborative design.
- Sustainability in extrusion-based additive manufacturing technologiesPublication . Freitas, Dino; Henrique A. Almeida; Bartolo, Helena; Bártolo, Paulo J.Growing environmental and social concerns about human society’s impact on the natural environment have been pushing sustainable development issues into the front line of public policies. The degradation of natural resources has been aggravated by several other factors: the actual lifestyle of consumer societies, the rapid growth of emerging countries, rising inequalities among regions, and the reduction of the life cycle time for each product requiring a high consumption of limited resources. Sustainable industrial practices can contribute to the development of more sustainable products and processes. It is critical to apply eco-design principles and develop greener products and production processes, reducing impacts associated with its production and consumption. An environmental impact assessment should be taken into account from the early design and production phases, through all the stages of a product’s life until disposal. As public interest in additive manufacturing grows, its increasing usage for the production of final parts can support a drive towards more sustainable manufacturing processes. To introduce sustainability awareness during extrusion-based additive manufacturing productions, a study of the production of a part in terms its building orientation and internal filling, regarding the production time, energy consumption and end-of-life scenarios is considered. By combining the additive processes with eco-design, a higher awareness is possible, which results in added value to the produced parts while maintaining the part’s objective performance.