Metal Forming
Mostrando 1-12 de 156 artigos, teses e dissertações.
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1. Synthesis of a Ce-Based MOF-76 with High Yield: A Study of Reaction Parameters Based on a Factorial Design
The purpose of this work was to optimize the synthesis yield of {[Ce(BTC)(H2O)]·DMF}n, a metal-organic framework (MOF)-76 family member, by solvothermal method. CeCl3.7H2O and 1,3,5-benzenetricarboxylic acid, 2:1 molar proportion, were added to N, N-dimethylformamide (DMF). Reaction time and temperature were evaluated to optimize the synthesis through a fac
J. Braz. Chem. Soc.. Publicado em: 2020-03
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2. New Proposal to Calculate the Friction in Sheet Metal Forming Through Bending Under Tension Test
There are 6 different types of equations that have been formulated to measure friction through the bending under tension test, however, there is no work to show whether these calculations actually represent what is happening in a sheet metal stamping process. This paper aims to make a direct comparison between the bending under tension test and the sheet met
Mat. Res.. Publicado em: 20/01/2020
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3. Preparation and application of Zero Valent Iron immobilized in Activated Carbon for removal of hexavalent Chromium from synthetic effluent
RESUMO Diferentemente dos contaminantes orgânicos, os metais pesados não são biodegradáveis e tendem a se acumular nos organismos vivos e também são reconhecidos por serem tóxicos ou carcinogênicos. A utilização de nanopartículas de ferro zero valente (nFVZ) é relatada como uma técnica alternativa e de elevado potencial para remediação in situ
Rev. Ambient. Água. Publicado em: 03/10/2019
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4. Effect of surface roughness and lubrication on the friction coefficient in deep drawing processes of aluminum alloy aa1100 with fem analysis
ABSTRACT Friction between the interface workpiece and tooling has considerable importance in sheet metal forming operations; an accurate description of the friction is necessary to analyze and design new workpieces and tooling. This work suggests a methodology to determine and evaluate the mean coefficient of friction (COF) using the Finite Element Method (F
Matéria (Rio J.). Publicado em: 16/09/2019
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5. Effect of surface roughness and lubrication on the friction coefficient in deep drawing processes of aluminum alloy aa1100 with fem analysis 1
ABSTRACT Friction between the interface workpiece and tooling has considerable importance in sheet metal forming operations; an accurate description of the friction is necessary to analyze and design new workpieces and tooling. This work suggests a methodology to determine and evaluate the mean coefficient of friction (COF) using the Finite Element Method (F
Matéria (Rio J.). Publicado em: 20/05/2019
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6. Adhesion and biofilm formation of Candida parapsilosis isolated from vaginal secretions to copper intrauterine devices
ABSTRACT Introduction: Candida parapsilosis is one of the main species that is able to adhere to forming biofilms on inert materials. Adhesion is the first step towards the colonization and invasion of host cells during the infectious process. Among the infections, vulvovaginal candidiasis is increasingly common. The objective was to evaluate the profile of
Rev. Inst. Med. trop. S. Paulo. Publicado em: 22/10/2018
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7. Efecto del cambio en el camino de deformación en la formabilidad de chapas de acero DP-780 y zinc Zn20
ABSTRACT The Forming Limit Diagram (FLD), frequently used to characterize the formability of sheet metals, is determined by assuming proportional loading histories up to the onset of necking. However, the limit strains are highly affected by strain-paths changes, which are very usual in real metal forming processes. The aim of this work is to analyze the eff
Matéria (Rio J.). Publicado em: 19/07/2018
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8. Métodos temporales para determinar deformaciones límite en chapas metálicas
ABSTRACT The forming limit diagram (FLD) –broadly used to characterize sheet-metal formability– is made by means of strain measurement over the surface of stretched samples and the subsequent determination of limit-strain values associated with the onset of necking. Currently, researchers can make strain measurements with digital image-correlation analys
Matéria (Rio J.). Publicado em: 19/07/2018
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9. Análisis de la corrosión de uniones por soldadura fuerte de compósitos matriz cobre
ABSTRACT This work presents an electrochemical corrosion study in synthetic seawater of the dissimilar joint of TiC/Cu composite by brazing technique. Composites were machined by liquid infiltration without external pressure. This composite were joined with copper using a filler material constituted by an alloy of silver - copper and titanium powder. The com
Matéria (Rio J.). Publicado em: 19/07/2018
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10. Estudio de la formabilidad en caliente de aleaciones de titanio a través del ensayo de torsión y su aplicación a la optimización de procesos de forja y extrusión
ABSTRACT In the development of hot metal forming, the metallic products must comply with the requirements imposed by current standards. In some cases, the required microstructure can only be obtained through thermomechanical processing. With titanium and its alloys, small ranges of good workability are an additional difficulty. In this work the hot-workabili
Matéria (Rio J.). Publicado em: 19/07/2018
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11. Structure/Activity of PtII/N,N-Disubstituted-N'-acylthiourea Complexes: Anti-Tumor and Anti-Mycobacterium tuberculosis Activities
The syntheses, characterization, cytotoxicity against tumor cells and anti-Mycobacterium tuberculosis activity assays of PtII/PPh3/N,N-disubstituted-N'-acylthioureas complexes with general formulae [Pt(PPh3)2(L)]PF6, PPh3 = triphenylphosphine; L = N,N-disubstituted-N'-acylthiourea, are here reported. The complexes were characterized by elemental analysis, mo
J. Braz. Chem. Soc.. Publicado em: 2018-06
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12. An axisymmetric nodal averaged finite element
Abstract A nodal averaging technique which was earlier used for plane strain and three-dimensional problems is extended to include the axisymmetric one. Based on the virtual work principle, an expression for nodal force is found. In turn, a nodal force variation yields a stiffness matrix that proves to be non-symmetrical. But, cumbersome non-symmetrical ter
Lat. Am. j. solids struct.. Publicado em: 26/04/2018