28 documents found, page 1 of 3
Stress-based model for calculating the opening angle of notch cracks in a magne...
Videira, Henrique; Anes, Vitor; Reis, LuísThis paper presents a model to calculate the opening angle of crack initiation in notched fractures subjected to multiaxial loading. To validate the proposed model, a study was performed on polished AZ31B-F magnesium alloy specimens under multiaxial high-cycle fatigue loading. The specimens exhibited a notch in the smaller cross-sectional area, which was created with a special drilling jig to promote the format...
Study of the Condition of Forest Fire Fighting Vehicles
Silva, Filipe; Raposo, Jorge; Farinha, José Torres; Raposo, Hugo; Reis, LuísThe Forest Fire Fighting Vehicle (FFFV) is one of the most important pieces of equipment in direct firefighting; therefore, its maintenance is strategic to guarantee high levels of reliability. The history of interventions is essential to support the increase in the quality of maintenance, namely with regard to the specificity of each equipment, in its actual operating conditions. In the absence of previous inf...
Review on laser shock peening Effect on fatigue of power bed fusion materials
Bumba, Francisco; Morais, Paulo; Batalha, Rodolfo; Anes, Vitor; Reis, LuísThe ability to manufacture parts with complex geometry by sending a model from CAD directly to the manufacturing machine has attracted much attention in the industry, driving the development of additive manufacturing technology. However, studies have shown that components manufactured using additive manufacturing technology have several problems, namely high tensile residual stresses, cracks, and voids, which a...
Evaluating and prescribing physical activity and exercise in health centers for...
Teixeira, José Eduardo; Bragada, José A.; Bragada, João P.; Reis, Luís; Magalhães, PedroPhysical activity (PA) and exercise are vital for health promotion (Ács et al., 2020; Blue, 2017). Regular exercise, combined with dietary advice, significantly improved to normal values the metabolic syndrome (MetS) factors (Magalhães et al., 2023; Teixeira et al., 2022). Thus, the health centres should provide PA assessment and prescription, ensuring trained personnel, dedicated space, and regular follow-up f...
Evaluating and prescribing physical activity and exercise in health centers for...
Teixeira, José; Bragada, José A.; Bragada, João P.; Reis, Luís; Magalhães, PedroPhysical activity (PA) and exercise are vital for health promotion (Ács et al., 2020; Blue, 2017). Regular exercise, combined with dietary advice, significantly improved to normal values the metabolic syndrome (MetS) factors (Magalhães et al., 2023; Teixeira et al., 2022). Thus, the health centres should provide PA assessment and prescription, ensuring trained personnel, dedicated space, and regular follow-up f...
Determination of the relationship between proportional and non-proportional fat...
Anes, Vitor; Bumba, Francisco; Reis, Luís; Freitas, ManuelIn this work, the magnesium alloy AZ31BF subjected to proportional and non-proportional loads has been studied. For this purpose, a series of experimental multiaxial fatigue tests were carried out according to the ASTM E466 protocol. The main objective was to determine the relationship between the multiaxial fatigue strength of this alloy under these two different types of loading. The results showed that the A...
Simulation of the cyclic stress-strain behavior of the magnesium alloy AZ31B-F ...
Anes, Vitor; Moreira, Rogério; Reis, Luís; Freitas, ManuelUnder strain control tests and cyclic loading, extruded magnesium alloys exhibit a special mechanism of plastic deformation ("twinning" and "de-twining"). As a result, magnesium alloys exhibit an asymmetric material behavior that cannot be fully characterized with the typical numerical tools used for steels or aluminum alloys. In this sense, a new phenomenological model, called hypo-strain, has been developed t...
A compreensão de "textos informativos" no 2.º CEB - relato e avaliação de percu...
Reis, Luís; Jorge, Noémia de OliveiraO presente artigo pretende dar a conhecer uma proposta pedagógica orientada para a compreensão de “textos informativos” e implementada na disciplina de Português, numa turma de 5.º ano de escolaridade, no ano letivo de 2022/2023. Enquadrada por um procedimento didático específico – o percurso didático (Jorge, 2019) –, a intervenção centrou-se no contacto com “textos informativos” pertencentes a vários géneros t...
A Protection for LPG Domestic Cylinders at Wildland-Urban Interface Fire
Barbosa, Thiago Fernandes; Reis, Luís; Raposo, Jorge; Viegas, Domingos XavierWildland fires are frequent events worldwide, particularly in the European-Mediterranean region, USA, and Australia. These fires have been more frequent and intense in recent years due to climate changes and may cause significant damage, especially when reaching the Wildland-Urban Interface (WUI) areas. The presence of liquefied petroleum gas (LPG) cylinders may cause severe events in WUI areas, as occurred in ...
Manual para a cultura do Kiwi
Casais, Vinícius Oliveira; Loureiro, João; Gomes, Alexandra; Reis, Luís; Castro, Silvia; Costa, JoanaO trabalho foi realizado no âmbito da iniciativa comunitária Ação 1.1 Grupos Operacionais “I9K – InovKiwi - Desenvolvimento de estratégias que visem a sustentabilidade da fileira do kiwi através da criação de um produto de valor acrescentado”, promovida pelo PDR2020 e cofinanciada pelo FEADER, no âmbito do Portugal 2020. Os autores agradecem à Associação Portuguesa de Kiwicultores, bem como aos produtores e téc...