5 documents found, page 1 of 1
On the aging kinetics of a flame-resistant AZ91D-1.5%Ca magnesium alloy process...
Gomes, Inês Varela; D’Errico, Fabrizio; Alves, José L.; Puga, HélderThe Mg-Al-Zn-Ca system has demonstrated excellent flame resistance and mechanical properties in the as-cast condition. However, the potential of these alloys to be heat-treated, e.g., by aging, as well as the influence of the initial microstructure on the precipitation kinetics, is yet to be comprehensively explored. Ultrasound treatment was applied during the solidification of an AZ91D-1.5%Ca alloy to promote ...
Analysis of ESAFORM 2021 cup drawing benchmark of an Al alloy, critical factors...
Habraken, Anne Marie; Aksen, Toros Arda; Alves, José L.; Amaral, Rui L.; Betaieb, Ehssen; Chandola, Nitin; Corallo, Luca; Cruz, Daniel J.This article details the ESAFORM Benchmark 2021. The deep drawing cup of a 1 mm thick, AA 6016-T4 sheet with a strong cube texture was simulated by 11 teams relying on phenomenological or crystal plasticity approaches, using commercial or self-developed Finite Element (FE) codes, with solid, continuum or classical shell elements and different contact models. The material characterization (tensile tests, biaxial...
Numerical Analysis of Residual Stresses in Parts Produced by Selective Laser Me...
Marques, Bruno M.; Andrade, Carlos M.; Neto, Diogo M.; Oliveira, Marta C.; Alves, José L.; Menezes, Luís F.Additive manufacturing (AM) of metallic components has received large attention in the last decade, particularly the selective laser melting (SLM) process, due to its ability to produce complex and customized parts. However, the high residual stresses generated by the thermal cycles can lead to significant distortions and ultimately to the part cracking. Therefore, several numerical simulation tools have been a...
A Modified Hockett-Sherby Law Enabling the Description of the Thermomechanical ...
Oliveira, Marta C.; Germain, Lisa; Laurent, Hervé; Simões, Vasco M.; Neto, Diogo M.; Alves, José L.; Menezes, Luís F.The use of warm temperatures in the forming process enhances the aluminium alloys formability and reduces the springback effect, when compared with room temperature conditions. However, in order to be able to design warm forming processes it is necessary to describe the influence of temperature and strain rate on the mechanical behaviour of the material. This work presents the procedure adopted to identify the ...
Numerical Study on the Formability of Metallic Bipolar Plates for Proton Exchan...
Neto, Diogo M.; Oliveira, Marta C.; Alves, José L.; Menezes, Luís F.Thin stamped bipolar plates (BPPs) are viewed as promising alternatives to traditional graphite BPPs in proton exchange membrane fuel cells. Metallic BPPs provide good thermal/electrical conductivity and exhibit high mechanical strength, to support the loads within the stack. However, BPPs manufactured by stamping processes are prone to defects. In this study, the e ect of the tool’s geometry on the thin sheet ...