J. A. Sousa
University of Aveiro
InertiaUltimate tensile strengthDigital image correlationComposite materialEpoxyTensile testingHardening (metallurgy)MartensiteMetallurgyMaterials scienceConstitutive equationTwistBlankElectron backscatter diffractionDeep drawingSofteningStress concentrationTorsion (mechanics)Residual stressFracture (geology)Stress intensity factorViscoplasticityFracture mechanicsStructural engineeringDelaminationFormabilityPlasticityAnisotropyMicrostructureStress (mechanics)Fracture toughness
4Publications
10H-index
80Citations
Publications 16
Newest
#1Juan Liao (University of Aveiro)H-Index: 10
#2J. A. Sousa (University of Aveiro)H-Index: 10
Last. António B. Pereira (University of Aveiro)H-Index: 23
view all 6 authors...
Abstract This paper aims to identify the mechanisms associated to the transient hardening behaviour of dual phase steels under strain path changes, and to capture the observed material behaviours with appropriate constitutive models. First, three DP steel sheets with different amounts of martensite were tested under monotonic and various strain path changes. Second, microstructural analysis of the materials before and after strain path change were performed by means of SEM, TEM, and EBSD. The co...
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#1Rui AmaralH-Index: 6
#2A. D. Santos (University of Porto)H-Index: 1
Last. Augusto B. Lopes (University of Aveiro)H-Index: 19
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The transportation industry, in particular the automotive industry, is facing a number of challenges that include a continuous increase on the requirements defined by legislation on efficiency, fuel consumption, gas emissions and safety. These challenges can be addressed by the use of stronger materials to produce thinner components that contributes for weight reduction of automobiles and improvements of aspects related to the safety. Among high-strength materials, the dual phase (DP) steels com...
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#1Xin Xue (University of Aveiro)H-Index: 11
#2Juan Liao (University of Aveiro)H-Index: 10
Last. José Grácio (University of Aveiro)H-Index: 57
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Abstract Twist springback induced by unbalance elastic deformation and residual stresses in a sheet after a forming is of particular importance and complexity. The twist springback can be influenced by several factors, such as blank shape geometry, material anisotropy and sheet piercing. A sensitivity study of these parameters provides insight into the twist springback control of rail parts. In the present work, a more reasonable evaluation of twist springback of a long member with respect to th...
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#1J. A. Sousa (University of Aveiro)H-Index: 10
#2António B. Pereira (University of Aveiro)H-Index: 23
Last. A.B. de Morais (University of Aveiro)H-Index: 26
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Abstract The fatigue delamination behaviour of carbon/epoxy laminates was investigated through end-notched flexure tests carried out under displacement control. Fatigue tests were conducted at different stress ratios from pre-cracks generated in initial quasi-static tests, which provided fracture toughness values. Crack propagation rates were obtained by a new approach that employed the effective crack method and considered propagation increments of small strain-energy release rate variation. Th...
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#1Israel Nunes Henrique (UFPB: Federal University of Paraíba)H-Index: 6
#2J. A. Sousa (UFPB: Federal University of Paraíba)H-Index: 10
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In recent years, there has been an increasing need to design wastewater treatment systems that are capable of removing both organic material and nutrients, notably nitrogen and phosphorus. This study evaluated biological phosphorus removal by activated sludge systems fed with domestic sewage and operating as sequencing batch reactors (SBR) with different solids retention times (SRT) namely 20, 5 and 3 days. This was supported by respirometry experiments at bench scale using acetate as the source...
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#1Artenisa Cerqueira Rodrigues (UFPB: Federal University of Paraíba)H-Index: 10
#2Lourival Ferreira Cavalcante (UFPB: Federal University of Paraíba)H-Index: 16
Last. Francisco de Oliveira Mesquita (UFPB: Federal University of Paraíba)H-Index: 6
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An experiment was carried out during the period from December, 2005 to July, 2006, in municipality of Remigio, Paraiba, Brazil, in order to evaluate the effects of the biofertilizer "supermagro" applied to soil in liquid form diluted in water in a ratio of 1:4, 30 days before and at intervals of 90 days after planting in absence and presence of potassium applied 60 days after planting and every 60 days subsequently until harvest on the production and mineral nutrition of yellow passion fruit pla...
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In this study the anaerobic treatment of organic solid waste with high and low concentrations of solids was studied. The experimental system comprised of two reactors, with unitary capacity of 2,200 L, while the used substrate was composed of solid vegetable waste and sludge. One of the reactors was loaded with substrate containing 20% of total solids and the other with only 5% of total solids on weight basis. It was verified that, for the substrate containing 5% of total solids, the retention t...
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#1Salomão de Andrade Pascoal (UFPB: Federal University of Paraíba)H-Index: 1
#2Carlos Antônio Pereira de Lima (State University of Paraíba)H-Index: 3
Last. Fernando Fernandes Vieira (State University of Paraíba)H-Index: 8
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Tannery effluents are very dangerous for the environment since they contain large amounts of dangerous and biorecalcitrant contaminants (organic matter and Cr(VI)). This paper reports the efficiency of heterogeneous photocatalysis, based on the application of solar and artificial radiation, furnished by UV lamps, using TiO2 fixed on a flat plate, in the treatment of synthetic effluents. The results of COD and Cr(VI) demonstrate that the use of solar radiation is the most efficient way to perform...
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In this paper an evaluation is made on the performance of cultivated green pepper submitted to five different treatments: 1) irrigation with well water and soil without fertilizer; 2) irrigation with well water and soil with mineral fertilization; 3) irrigation with well water and soil with organic fertilizer; 4) irrigation with polishing pond effluent; and 5) irrigation with UASB reactor effluent. The experiment was conducted in a randomized blocks design, with four repetitions, and data were s...
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Last. Valderi Duarte LeiteH-Index: 14
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Resumen pt: Os esgotos sanitarios apresentam grande ameaca ao meio ambiente quando lancados inadequadamente em corpos d’agua, porem, podem ser tratados e utilizados ...
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