Project/scholarship details

  • Funder

    FCT - Fundação para a Ciência e a Tecnologia, I.P.

  • Funder's country

    Portugal

  • Funding program

    5876-PPCDTI

  • Funding amount

    190,101.00 €

  • Start date

    2013-07-01

  • End date

    2015-11-30

Documents

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Mechanical characterization and constitutive parameter identification of anisot...

Khalfallah, Ali; Oliveira, Marta Cristina; Alves, J. L.; Zribi, Temim; Belhadjsalah, Hédi; Menezes, Luís Filipe

This paper aims to identify the constitutive parameters of anisotropic tubular materials and to verify the accuracy of models' prediction. The identification of the constitutive parameters is based on information obtained from tensile tests, performed on samples cut from the tubes, and from the free tubular bulge test, using a home-developed bulge forming machine. Two tubular materials exhibiting different anis...

Date: 2015   |   Origin: RepositóriUM - Universidade do Minho
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Influence of the characteristics of the experimental data set used to identify ...

Khalfallah, Ali; Alves, J. L.; Oliveira, Marta Cristina; Menezes, Luís Filipe

This work presents an investigation into the effect of the number and type of experimental input data used in parameter identification of Hill’48, Barlat’91 (Yld91) and Cazacu and Barlat’2001 (CB2001) yield criteria on the accuracy of the finite element simulation results. Different sets of experimental data are used to identify the anisotropy parameters of two metal sheets, exhibiting different anisotropic beh...

Date: 2015   |   Origin: RepositóriUM - Universidade do Minho
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Numerical analysis of different heating systems for warm sheet metal forming

Martins, J. M. P.; Alves, J. L.; Neto, D. M.; Oliveira, M. C.; Menezes, L. F.

The main goal of this study is to present an analysis of different heating methods frequently used in laboratory scale and in the industrial practice to heat blanks at warm temperatures. In this context, the blank can be heated inside the forming tools (internal method) or using a heating system (external method). In order to perform this analysis, a finite element model is firstly validated with the simulation...

Date: 2016   |   Origin: RepositóriUM - Universidade do Minho
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Evaluation of strain and stress states in the single point incremental forming ...

Neto, D. M.; Martins, J. M. P.; Oliveira, M. C.; Menezes, L. F.; Alves, J. L.

Single point incremental forming (SPIF) is a promising manufacturing process suitable for small batch production. Furthermore, the material formability is enhanced in comparison with the conventional sheet metal forming processes, resulting from the small plastic zone and the incremental nature. Nevertheless, the further development of the SPIF process requires the full understanding of the material deformation...

Date: 2016   |   Origin: RepositóriUM - Universidade do Minho
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The role of tension-compression asymmetry of the plastic flow on ductility and ...

Alves, J. L.; Oliveira, M. C.; Menezes, L. F.; Cazacu, Oana

The influence of the tension-compression asymmetry of the plastic flow, due to intrinsic single-crystal deformation mechanisms, on porosity evolution and the overall ductility of voided metallic polycrystals is assessed. To this end, detailed micromechanical finite-element analyses of three-dimensional unit cells containing a single initially spherical cavity are carried out. The plastic flow of the matrix (ful...

Date: 2017   |   Origin: RepositóriUM - Universidade do Minho
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Numerical and experimental analysis of wrinkling during the cup drawing of an A...

Neto, D. M.; Oliveira, M. C.; Dick, R. E.; Barros, P. D.; Alves, J. L.; Menezes, L. F.

The recent trend to reduce the thickness of metallic sheets used in forming processes strongly increases the likelihood of the occurrence of wrinkling. Thus, in order to obtain defect-free components, the prediction of this kind of defect becomes extremely important in the tool design and selection of process parameters. In this study, the sheet metal forming process proposed as a benchmark in the Numisheet 201...

Date: 2017   |   Origin: RepositóriUM - Universidade do Minho
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