1,721,147 research outputs found
COMPUTATIONAL MODELS FOR THE SIMULATION OF THE FORMING PROCESS OF CARTON PACKAGES
No full textThis paper synthetically describes new numerical tools developed for the simulation of the mechanical process of forming carton packages for beverages.
Two topics are here considered: the simulation of the folding process of the paperboard along pre-formed crease lines and the simulation of the interaction between the container and the filling liquid. For the first topic, an interface finite element and constitutive model is proposed to simulate the presence of crease lines in a paperboard. The proposed model, formulated in terms of axial forces and bending moments, accounts for progressive plasticity and damage in the creased material, showing a good correspondence with the results of bending tests for varying initial crease characteristics.
For the second topic, a fully Lagrangian finite element method for fluid-structure interaction problems is proposed. The method is inspired to the so called particle finite element method, first introduced by Idelsohn and O\~{n}ate and is based on a continuous Delaunay re-triangulation of the mesh. The method is providing good results for 2D problems, while extension to 3D problems and to the interaction with shell structures is currently in progress
EXPLICIT BACKWARD DIFFERENCE-OPERATORS AND CONSISTENT PREDICTORS FOR LINEAR HARDENING ELASTIC-PLASTIC CONSTITUTIVE LAWS
No full textA variationally consistent generalized variable formulation for enhanced strain finite elements
No full textSolution of Large Eigenproblems on a Microcomputer
No full textA microcomputer program is presented for determining
the lowest eigenfrequencies of large structural
systems by using the finite element method.
The solution procedure is based upon the subspace
iteration technique. Householder's tridiagonalisation
and the Q L method are used in order to solve
the eigenproblem in the reduced space at each
iteration. The computer code has been implemented
in BASIC and its present version is suitable
for the solution of eigensystems with 1000-2000
degrees of freedom. The features of the program
are pointed out and numerical tests are presented.
It is shown that very accurate results can be obtained,
although the computer system we have
used sets a few constraints which often imply very
long computing times (particularly when large
bandwidth systems are given)
Stima dell'errore per l'integrazione temporale di tipo 'backward-difference' in plasticità computazionale, Una
No full textA two-phase model for chemo-damage induced anisotropy in concrete
No full textChemical reactions, supported by temperature variations, may produce growing damage in existing concrete structures. With specific reference to the expanding gel produced by the alkali-aggregate-reaction, occurring in many ageing concrete structures such as concrete dams and reinforced concrete bridges, an anisotropic bi-phase coupled chemo-thermo-mechanical anisotropic damage model is proposed, capable to account for the macroscopic strength and stiffness deterioration in the concrete skeleton due to the expanding gel. The model is validated against experimental tests taken from the literature
A variationally consistent generalized variable formulation of the elastoplastic rate problem.
No full text- …
