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Start Over Descriptor "Reduced stiffness" Topic finite elements
4 results on '"Reduced stiffness"'

1. Application of Reduced Stiffness of Complex Laminate in Finite Elements for Chair Analysis.

Author

Nestorović, Biserka, Grbac, Ivica, Nestorović, Predrag, and Milošević, Jelena

Abstract

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Published
2015
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2. A reduced stiffness approach for the buckling of open cylindrical tanks under wind loads

Author

Jaca, Rossana C., Godoy, Luis A., Flores, Fernando G., and Croll, James G.A.

Subjects
*MECHANICAL buckling, *STRAINS & stresses (Mechanics), *FINITE element method, *PRESSURE vessels
Abstract

Abstract: This paper reports on the implementation of a lower bound approach to the buckling analysis of cylindrical shells for tanks subjected to wind loads. The formulation is based on a reduced energy model of the shell adapted to a special purpose, semi-analytical, finite element program in which it is possible to separately compute the membrane and bending energy contributions. First, the energy components are investigated, in order to identify stabilizing and destabilizing contributions. Second, an eigenvalue analysis is carried out using a reduced value of the stiffness, in which membrane components are eliminated on the basis that they are assumed to be eroded as a result of mode coupling catalyzed by imperfections. The methodology is employed for thin-walled, above ground, tanks under wind pressures. It is shown that the resulting critical loads constitute lower bounds to those obtained using a nonlinear analysis of the shell, including imperfections, and also to those obtained from experiments. [Copyright &y& Elsevier]

Published
2007
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3. Application of Reduced Stiffness of Complex Laminate in Finite Elements for Chair Analysis

Author

Biserka Nestorović, Predrag Nestorovic, Ivica Grbac, and Jelena Milosevic

Subjects
Materials science, Reduced stiffness, medicine.medical_treatment, Subroutine, Finite elements, Composite, Material constants, chair, Matrix (mathematics), Shell, medicine, composite, business.industry, fi nite elements, Stiffness, Forestry, Structural engineering, SD1-669.5, Finite element method, Numerical integration, Nonlinear system, material constants, Chair, shell, Plate theory, reduced stiffness, Veneer, medicine.symptom, business
Abstract

This paper presents a numerical procedure for the analysis of complex laminate structures. The procedure is based on the application of reduced stiffness of complex laminate. Introduction of reduced stiffness of composite facilitates both linear and nonlinear numerical integration, i.e. the tangential stiffness matrix is translated in the classical plate theory problem. The formulated numerical procedure was implemented in the program system KOMIPS. Special subroutine REDKRUT that calculates reduced stiffness of the laminate was written, and its application in numerical verification of experiments conducted on chairs was presented in (Nestorovic, 2010). At the end of this work, for 3D stress and strain analysis of veneer composites, recommendations were given for experimental determination of all nine independent material constants E-x, E-y, E-z, v(xy), v(xz), G(xy), G(xz), G(yz), five of which were determined in the previous paper of the author (Nestorovic, 2010).

Published
2015

4. Primjena reducirane krutosti kompleksnog laminata u konačnim elementima za analizu stolaca

Author

Biserka Nestorović, Ivica Grbac, Predrag Nestorović, and Jelena Milošević

Subjects
reduced stiffness, finite elements, composite, material constants, shell, chair, reducirana krutost, konačni elementi, kompozit, materijalne konstante, ljuska, stolac
Abstract

This paper presents a numerical procedure for the analysis of complex laminate structures. The procedure is based on the application of reduced stiffness of complex laminate. Introduction of reduced stiffness of composite facilitates both linear and nonlinear numerical integration, i.e. the tangential stiffness matrix is translated in the classical plate theory problem. The formulated numerical procedure was implemented in the program system KOMIPS. Special subroutine REDKRUT that calculates reduced stiffness of the laminate was written, and its application in numerical verification of experiments conducted on chairs was presented in (Nestorovic, 2010). At the end of this work, for 3D stress and strain analysis of veneer composites, recommendations were given for experimental determination of all nine independent material constants Ex, Ey, Ez, vxy, vxz, Gxy, Gxz, Gyz, fi ve of which were determined in the previous paper of the author (Nestorović, 2010)., Rad prikazuje numeričku proceduru za analizu struktura izrađenih od kompleksnih laminata. Postupak se temelji na primjeni reducirane krutosti komplesnog laminata. Uvođenjem reducirane krutosti kompozita numerička se integracija, kako linearne, tako i nelinearne, odnosno tangencijalne matrice krutosti, prevodi u problem klasične teorije ploča. Formulirana numerička procedura implementirana je u sklopu programskog paketa KOMIPS. Napisana je posebna subrutina REDKRUT, kojom se proračunavaju reducirane krutosti laminata, a njegova primjena u provjeri numeričkih eksperimenata provedenih na stolcima prikazana je u radu (Nestorovic, 2010.). Za 3-D analizu naprezanja i deformacija furnirskih kompozita na kraju ovog rada dane su preporuke za eksperimentalno određivanje svih devet neovisnih materijalnih konstanti: Ex, Ey, Ez, vxy, vxz, Gxy, Gxz, Gyz, od kojih je pet određeno u prethodnom autoričinu radu (Nestorović, 2010.).

Published
2015

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