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Sensitivity Analysis of the Square Cup Forming Process Using PAWN and Sobol Ind...
Parreira, Tomás G.; Rodrigues, Diogo C.; Oliveira, Marta C.; Sakharova, Nataliya A.; Prates, Pedro; Pereira, André F. G.This study investigates the sensitivity of the square cup forming process. It analyses how the uncertainties in the material properties, friction and process conditions affect the results of the square cup, such as equivalent plastic strain, geometry change, thickness reduction, punch force and springback. The cup flange and the die curvature region are identified as highly affected areas, while the cup bottom ...
A Study of the Mechanical Behaviour of Boron Nitride Nanosheets Using Numerical...
Sakharova, Nataliya A.; Pereira, André F. G.; Antunes, Jorge M.Hexagonal boron nitride (h-BN) nanosheets are attractive materials for various applications that require efficient heat transfer, surface adsorption capability, biocompatibility, and flexibility, such as optoelectronics and power electronics devices, nanoelectromechanical systems, and aerospace industry. Knowledge of the mechanical behavior of boron nitride nanosheets is necessary to achieve accurate design and...
Numerical Simulation Study of the Mechanical Behaviour of 1D and 2D Germanium C...
Fernandes, José V.; Pereira, André F. G.; Antunes, Jorge M.; Chaparro, Bruno M.; Sakharova, Nataliya A.One-dimensional (nanotubes) and two-dimensional (nanosheets) germanium carbide (GeC) and tin carbide (SnC) structures have been predicted and studied only theoretically. Understanding their mechanical behaviour is crucial, considering forthcoming prospects, especially in batteries and fuel cells. Within this framework, the present study aims at the numerical evaluation of the elastic properties, surface Young's...
On the Determination of Elastic Properties of Indium Nitride Nanosheets and Nan...
Sakharova, Nataliya A.; Pereira, André F. G.; Antunes, Jorge M.; Chaparro, Bruno M.; Fernandes, José V.Among the semiconductors formed by a 13th group element and nitrogen, indium nitride (InN) has promising electronic and optical properties, which make it an appropriate material for lightemitting devices and high-speed electronic applications. One-dimensional and two-dimensional InN structures, such as nanotubes and nanosheets, respectively, are expected to present novel advanced characteristics different from ...
Analysis of ESAFORM 2021 cup drawing benchmark of an Al alloy, critical factors...
Habraken, Anne Marie; Aksen, Toros Arda; Alves, J. 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...
On the development of dataset supported strategies for the constitutive paramet...
Prates, Pedro A.; Pereira, André F. G.; Fernandes, José V.; Sakharova, NataliyaThis work presents an exploratory study for the development of a dataset-supported strategy to identify the plastic behaviour of metal sheets. Datasets were generated from numerical simulation results obtained from the biaxial tensile test on a cruciform-shaped sample, for 4000 hypothetical materials. These datasets were used to simultaneously estimate the yield criterion and hardening law parameters of referen...
On the Determination of Elastic Properties of Single-Walled Boron Nitride Nanot...
Sakharova, Nataliya A.; Antunes, Jorge M.; Pereira, André F. G.; Chaparro, Bruno M.; Fernandes, José V.The elastic properties of chiral and non-chiral single-walled boron nitride nanotubes in a wide range of their chiral indices and diameters were studied. With this aim, a three-dimensional finite element model was used to assess their rigidities and, subsequently, elastic moduli and Poisson's ratio. An extensive study was performed to understand the impact of the input parameters on the results obtained by nume...
Mechanical Characterization of Multiwalled Carbon Nanotubes: Numerical Simulati...
Sakharova, Nataliya A.; Pereira, André F. G.; Antunes, Jorge M.; Fernandes, José V.The elastic properties of armchair and zigzag multiwalled carbon nanotubes were investigated under tensile, bending, and torsion loading conditions. A simplified finite element model of the multiwalled carbon nanotubes, without taking into account the van der Waals interactions between layers, was used to assess their tensile, bending, and torsional rigidities and, subsequently, Young's and shear moduli. Relati...
Mechanical Characterisation of Single-Walled Carbon Nanotube Heterojunctions: N...
Pereira, André F. G.; Antunes, Jorge M.; Fernandes, José V.; Sakharova, NataliyaThe elastic properties of single-walled carbon nanotube heterojunctions were investigated using conventional tensile, bending and torsion tests. A three-dimensional finite element model was built in order to describe the elastic behaviour of cone heterojunctions (armchair-armchair and zigzag-zigzag). This comprehensive systematic study, to evaluate the tensile, bending and torsional rigidities of heterojunction...
Performance Comparison of Parametric and Non-Parametric Regression Models for U...
Marques, Armando E.; Prates, Pedro A.; Pereira, André F. G.; Oliveira, Marta C.; Fernandes, José V.; Ribeiro, Bernardete M.This work aims to compare the performance of various parametric and non-parametric metamodeling techniques when applied to sheet metal forming processes. For this, the U-Channel and the Square Cup forming processes were studied. In both cases, three steel grades were considered, and numerical simulations were performed, in order to establish a database for each combination of forming process and material. Each ...