Search Results - "César de Sá, J."

A novel two-stage discrete crack method based on the screened Poisson equation and local mesh refinement by Areias, P., Rabczuk, T., de Sá, J. César

“…We propose an alternative crack propagation algorithm which effectively circumvents the variable transfer procedure adopted with classical mesh adaptation…”
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A simple assumed-strain quadrilateral shell element for finite strains and fracture by Areias, P., de Sá, J. M. César, Cardoso, R.

“…This work recovers an established technique for improving quadrilateral shell element performance in both out-of-plane and in-plane bending cases using a mixed…”
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Semi-implicit finite strain constitutive integration and mixed strain/stress control based on intermediate configurations by Areias, P., Rabczuk, T., César de Sá, J., Alves, J.L.

“…Figure 1: Pinched cylinder with Hill yield criterion (full constitutive system with stress condition). The anisotropic direction I is shown, as well as a top…”
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Finite strain quadrilateral shell using least-squares fit of relative Lagrangian in-plane strains by Areias, P., Rabczuk, T., César de Sá, J.M., Garção, J.E.

“…This work presents a finite strain quadrilateral element with least-squares assumed in-plane shear strains (in covariant/contravariant coordinates) and…”
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Evaluation of shear mechanisms and influence of the calibration point on the numerical results of the GTN model by Malcher, L., Reis, F.J.P., Andrade Pires, F.M., César de Sá, J.M.A.

“…In this contribution, a numerical comparative study is undertaken based on Gurson–Tvergaard–Needleman (GTN) original model and two recent enhancements that…”
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Analysis of 3D problems using a new enhanced strain hexahedral element by Areias, P. M. A., César de Sá, J. M. A., António, C. A. Conceição, Fernandes, A. A.

“…The now classical enhanced strain technique, employed with success for more than 10 years in solid, both 2D and 3D and shell finite elements, is here explored…”
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Effective 2D and 3D crack propagation with local mesh refinement and the screened Poisson equation by Areias, P., Reinoso, J., Camanho, P.P., César de Sá, J., Rabczuk, T.

“…•Crack path naturally obtained by mesh refinement and contraction.•Edge-based mesh refinement in 2D and 3D.•Area/Volume minimization based on element damage…”
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Assessment of different ductile damage models and experimental validation by Amaral, Rui, Teixeira, Pedro, Santos, Abel D., de Sá, J. César

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Coulomb frictional contact by explicit projection in the cone for finite displacement quasi-static problems by Areias, P., Rabczuk, T., de Melo, F. J. M. Queirós, de Sá, J. César

“…We propose, in this paper, a distinct perspective on the solution of the Coulomb frictional contact problem. By combining the prediction/correction method for…”
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An extended GTN model for ductile fracture under high and low stress triaxiality by Malcher, L., Andrade Pires, F.M., César de Sá, J.M.A.

“…•A network alteration theory for the Mullins effect, the permanent set and the stress-softening.•Reconciliation between physical and phenomenological…”
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New enhanced strain elements for incompressible problems by César de Sá, J. M. A., Natal Jorge, R. M.

“…A new enhanced strain element, based on the definition of extra compatibles modes of deformation added to the standard four‐node finite element, is initially…”
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Finite element prediction of ductile fracture in sheet metal forming processes by Teixeira, Pedro, Santos, A.D., Andrade Pires, F.M., César de Sá, J.M.A.

“…In this contribution, Lemaitre's ductile damage model is coupled with Hill's orthotropic plasticity criterion. The coupling between damaging and material…”
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Numerical integration algorithm of a new model for metal plasticity and fracture including pressure and lode angle dependence by Malcher, L., Andrade Pires, F. M., César de Sá, J. M. A., Andrade, F. X. C.

“…This paper describes an efficient numerical integration algorithm of a new model for metal plasticity and fracture [2]. The constitutive equations of the…”
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Integrated thermomechanical model for forming of glass containers by Martins, Bruno, Reis, Ana, Teixeira, Pedro, Machado, Margarida, Rodrigues, Jaime, Cesar de Sá, J.

“…In this work an integrated model for all the process of glass forming of glass containers is presented. The model addresses press-and-blow and blow-and-blow…”
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A simple and robust Coulomb frictional algorithm based on 3 additional degrees-of-freedom and smoothing by Areias, P., Pinto da Costa, A., Rabczuk, T., César de Sá, J.

“…Physical accuracy of discretization methods for frictional contact mechanics originates from precise representation of discontinuous frictional and normal…”
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Reproductive strategy of Psectrogaster rhomboides Eigenmann & Eigenmann, 1889, a freshwater fish from Northeastern Brazil by Soares de Araújo, A., Pedro de Souza, O., Silva do Nascimento, W., César Sá de Oliveira, J., Emília Yamamoto, M., Chellappa, S.

“…Summary Several environmental parameters related to the spawning season of the freshwater fish, Psectrogaster rhomboides were identified. The hypothesis…”
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Finite-strain low order shell using least-squares strains and two-parameter thickness extensibility by Areias, P., Rabczuk, T., Reinoso, J., César de Sá, J.

“…We present a thickness-extensible finite strain quadrilateral element based on least-squares in-plane shear strains and assumed transverse-shear strains. At…”
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Semi-implicit finite strain constitutive integration of porous plasticity models by Areias, P., Rabczuk, T., César de Sá, J.

“…Two porous plasticity models, Rousselier and Gurson–Tvergaard–Needleman (GTN), are integrated with a new semi-implicit integration algorithm for finite strain…”
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General constitutive updating for finite strain formulations based on assumed strains and the Jacobian by Areias, P., Natal Jorge, R., César de Sá, J., Rabczuk, T., Reinoso, J.

“…Compatibility between element technology featuring assumed (finite)-strains based on least-squares and current constitutive formulations employed in elastic…”
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Assessment of different ductile damage models and experimental validation by Amaral, Rui, Teixeira, Pedro, Santos, Abel D., de Sá, J. César

“…The tough fuel economy and emissions standards facing automotive industry creates the need for lightweight construction and the use of new generation of…”
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