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URI permanente para esta coleçãohttps://rihomolog.furg.br/handle/1/513

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2010 - 20132

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Autor: search.filters.author.Isoldi, Liércio AndréAssunto: search.filters.subject.Finite element method

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Agora exibindo 1 - 2 de 2
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    Linear static and dynamic analysis of thin laminated composite structures with a triangular finite element
    (2010) Isoldi, Liércio André; Awruch, Armando Miguel; Morsch, Inácio Benvegnu; Teixeira, Paulo Roberto de Freitas
    Linear static and dynamic behavior of thin laminate composite structures are analyzed in this study using the Finite Element Method (FEM). Triangular elements with three nodes and six degrees of freedom per node (three displacement and three rotation components) are used. For static analysis the equilibrium equations are solved using Pre-conditioned Gradient Conjugate Method (GCM) while the dynamic solution is performed using the classical Newmark Method. Analytical evaluation of consistent element mass matrix and determination of membrane and membrane-bending coupling element stiffness matrix in the explicit form are showed. Numerical examples are presented and compared with results obtained by other authors with different types of elements and different schemes, proving the validity and effectiveness of the developed model.
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    Elastic and elasto-plastic buckling analysis of perforated steel plates
    (2013) Real, Mauro de Vasconcellos; Isoldi, Liércio André; Damas, Alexandra Pinto; Helbig, Daniel
    Many steel structures such as ships and offshore structures are composed by welded stiffened or unstiffened plate elements. Cutouts are often provided in these plate elements for inspection, maintenance, and service purposes, and the size of these holes could be significant. In many situations, these plates are subjected to axial compressive forces which make them prone to instability or buckling. If the plate is slender, the buckling is elastic. However, if the plate is sturdy, it buckles in the plastic range causing the so-called inelastic (or elasto-plastic) buckling. Furthermore, the presence of these holes redistributes the membrane stresses in the plate and may cause significant reduction in its strength in addition to changing its buckling characteristics. So, the objective of this paper is to investigate the changes that the presence of circular holes produces in the elastic and inelastic buckling of steel rectangular plates. The finite element method (FEM) has been used to evaluate the elastic and elastoplastic buckling load of uniaxially loaded rectangular plates with circular cutouts. By varying the hole diameter, the plate aspect ratio and the plate thickness during the analyses, the changes in the plate buckling behavior can be determined. The results show that while the circular hole can in some cases even increase the elastic buckling load, the elasto-plastic buckling load is reduced by the presence of the cutout.