SIMULACION DE ALEACIONES METALICAS POROSAS A PARTIR DE UN MODELO MULTIESCALA HIPER-REDUCIDO

J.L. MROGINSKI

Resistencia, Chaco

Conferencia; Seminario de Mecánica Aplicada y Computacional (SEMAC 2016); 2016

UTN

The main aim of this work is to present a novel computational technique for reduced and hyper reduced order modelling solving multiscale problems in the FE2 framework. Regarding to the constitutive modelling a hyperelastic-based large strain elasto-plastic constitutive formulation is assumed with a classical Von Mises material model. To take into account the mechanical behavior at microscale level a classical Representative Volume Element (RVE) is assumed to be constituted by a matrix of homogeneous material with several voids randomly included at the microscale domain in order to realisticaly simulate the substruture geometry of a metalic aleation.Regarding to the reduce order technique, to diffente stage are defined. The first one is called ?off line? stage. In this procedure, the boundary value problem is solved for a sets of presentative stress trajectories on a high fidelity finite element mesh with the objective of gathering a set of discrete solutions (snapshots) of micro-strain fluctuations, as well as the corresponding snapshots of the Helmoltz free energy in the RVE.The following step is called ?on line? stage. The snapshots collected in the previous stage are used here for the solution of the reduced boundary value problem. As a result, a new reduced integration rule is obtained, leading to a reduced-quadrature variational problem and the consequent improvement in the computational cost with a highly reduction in the speed-ups.