Št. zadetkov: 15
Izvirni znanstveni članek
Oznake:
lupine;velike rotacije;shells;large rotations;shell structures;finite rotation;
In this work we present interrelations between different finite rotation parametrizations for geometrically exact classical shell models (i.e. models without drilling rotation). In these kind of models the finite rotations are unrestricted in size but constrained in the 3-d space. In the finite elem ...
Leto:
2001
Vir:
Fakulteta za gradbeništvo in geodezijo (UL FGG)
Izvirni znanstveni članek
Oznake:
lupine;3d napetosti;higher-order shell model;3d constitutive equations;stress computation;
In this work we study the accuracy of modem higher-order shell finite element formulations in computation of 3d stress state in elastic shells. In that sense we compare three higher-order shell models: (i) with seven dislacement-like kinematic parameters, and (ii, iii) with six displacement-like kin ...
Leto:
2008
Vir:
Fakulteta za gradbeništvo in geodezijo (UL FGG)
Objavljeni znanstveni prispevek na konferenci (vabljeno predavanje)
Oznake:
lupine;končni elementi;modeli višjega reda;nekompatibilne oblike;shells;finite elements;higher order models;incompatible models;
We discuss a theoretical formulation of shell model accounting for through-the-thickness stretching, which allows for large deformations and direct use of 3d constitutive equations. Three different possibilities for implementing this model within the framework of the finite element method are examin ...
Leto:
2002
Vir:
Fakulteta za gradbeništvo in geodezijo (UL FGG)
Izvirni znanstveni članek
Oznake:
frame;failure analysis;shell-beam model;strong discontinuity;plasticity;softening hinge;
In this work we present a new modelling paradigm for computing the complete failure of metal frames by combining the stress-resultant beam model and the shell model. The shell model is used to compute the material parameters that are needed by an inelastic stress-resultant beam model; therefore, we ...
Leto:
2010
Vir:
Fakulteta za gradbeništvo in geodezijo (UL FGG)
Izvirni znanstveni članek
Oznake:
lupine;velike rotacije;časovne integracijske sheme;ohranitev energije;disipacija energije;shells;time-stepping schemes;energy conservation;energy decaying;finite rotations;nonlinear dynamics;finite elrments;
In this work we study the time-stepping schemes for shell models, which describe the shell-director vector motion by the finite rotations. Different possibilities for choosing director rotations are examined and their relationships are cast in terms of the commutative diagram. The Newmark time-stepp ...
Leto:
2003
Vir:
Fakulteta za gradbeništvo in geodezijo (UL FGG)
Izvirni znanstveni članek
Oznake:
gradbene konstrukcije;vgrajena neveznost;porušitev materiala;mehčanje;civil engineering;embedded discontinuity;material failure;softening;
We present a quadrilateral finite element with discontinuous displacement fields that can be used to model material failure in 2d brittle and ductile solids. The element provides mesh-objective results. The element's kinematics can represent linear displacement jumps along the discontinuity line in ...
Leto:
2010
Vir:
Fakulteta za gradbeništvo in geodezijo (UL FGG)
Izvirni znanstveni članek
Oznake:
plošče;ocena napake;modelske napake;plates;error analysis;finite element analysis;modelling;plate structures;
Purpose – The purpose of this paper is to address error-controlled adaptive finite element (FE) method for thin and thick plates. A procedure is presented for determining the most suitable plate model (among available hierarchical plate models) for each particular FE of the selected mesh, that is pr ...
Leto:
2009
Vir:
Fakulteta za gradbeništvo in geodezijo (UL FGG)
Izvirni znanstveni članek
Oznake:
lupinaste konstrukcije;dinamika;numerična analiza;shell structures;dynamics;numerical analysis;
Purpose – Aims to address the issues pertaining to dynamics of constrained finite rotations as a follow-up from previous considerations in statics.
Design/methodology/approach – A conceptual approach is taken.
Findings – In this work the corresponding version of the Newmark time-stepping sch ...
Leto:
2005
Vir:
Fakulteta za gradbeništvo in geodezijo (UL FGG)
Izvirni znanstveni članek
Oznake:
embedded crack;plain concrete;finite elements;dicontinuities;
We present a quadrilateral finite element with an embedded crack that can be used to model tensile fracture in two-dimensional concrete solids and the crack growth. The element has kinematics that can represent linear jumps in both normal and tangential displacements along the crack line. The cohesi ...
Leto:
2010
Vir:
Fakulteta za gradbeništvo in geodezijo (UL FGG)
Izvirni znanstveni članek
Oznake:
modeliranje loma materiala;četverokotni končni element;vstavljena močna nezveznost;nekompatibilni pomiki;mehčanje;dinamična odpoved materiala;fracture modelling;quadrilateral finite element;embedded strong discontinuity;incompatible mode method;rigid-damage softening;dynamic fracture;
We show that for the simulation of crack propagation in quasi-brittle, two-dimensional solids, very good results can be obtained with an embedded strong discontinuity quadrilateral finite element that has incompatible modes. Even more importantly, we demonstrate that these results can be obtained wi ...
Leto:
2021
Vir:
Fakulteta za gradbeništvo in geodezijo (UL FGG)