CEMEF vendredi 15 mai - Professors M. Cruchaga (Univ. of Santiago) & D. Celentano (Pontificia Universidad Católica de Chile)

Friday, May 15th from 10 am to 11 am in Room IR016
Prof. Marcela Cruchaga (Univ. of Santiago, Chile)
Title: Numerical modelling and experimental validation for free surface flow problems
Abstract: The present work reports an experimental validation for free surface flows formulations. In particular, the breaking dam and the sloshing problem in rectangular tanks are analyzed. The numerical study is performed using a fixed-mesh Navier-Stokes monolithic formulation coupled with two different techniques to describe the free surface evolution: a capturing and a Lagrangian tracking techniques. A shared memory parallel technique was implemented to compute the matrices and right hand side blocks using the Open Multiprocessing standard (OpenMP) and to solve the resulting algebraic system of equations with the Intel Math Kernel Library (MKL). Different free surface flow problems: the collapse of a liquid column and sloshing cases are presented. The computed results of the free surface wave history at different control points are validated with those registered from experiments.

Prof. Diego Celentano (Pontificia Universidad Católica de Chile)
Title: Experimental-numerical methodology for the manufacturing prosthesis via laser forming

Abstract: This work presents an experimental-numerical methodology aimed at addressing the effect of laser beam power and scanning velocity on the thermomechanical material response during the laser bending of AISI 304 sheets. The main motivation is to obtain a database (with laser beam power and scanning velocity as the independent variables and the different deformation patterns as the dependent variables) to be used in the manufacture of prosthesis prototypes via laser forming. To this end, a series of single-pass laser bending tests are performed and, in order to achieve an adequate material characterization, the resulting bending angles are measured and compared with the corresponding numerical predictions computed by means of a coupled thermomechanical plasticity-based formulation, which is discretized and solved in the context of the finite element method, accounting for large strains, temperature-dependent material properties and convection-radiation phenomena.