Juan Manuel Podesta

• Doctor of Engineering
• Professor (Assistant) at National University of the Northeast

In this work we propose and analyze several novel topological designs of metamaterial exhibiting elastic phase transitions. These phase transitions emerge as a consequence of the bistability of the metamaterials unit cell. The metamaterials achieve bistability through geometrically non-linear deformations involving chiral mechanisms and their topol...

Photovoltaic modules are one of the intensively used technologies that provide a renewable energy alternative to electricity generation. Consequently, these devices have been studied using different approaches in order to determine their aerodynamic characteristics. Nevertheless, there is still a lack of guidelines from the codes of practice that c...

The present contribution describes an optimization-based design technique of elastic isotropic periodic microarchitectures with crystal symmetries aiming at the realization of composites with extreme properties. To achieve this goal, three consecutive procedures are followed: i) a series of inverse homogenization problems with symmetry constraints,...

Among other numerical issues, it is well known that the finite element method (FEM) lacks objectivity in reproducing high deformation rates due to extreme external actions. In geotechnical applications, the coupling of large solid deformations with the pore fluid flow is a critical subject, being one of the multiple scenarios where FEM could have r...

An analysis of the symmetries characterizing the micro-architecture topolo-gies and the elastic material properties is performed. The goal is to elucidate a systematic procedure that facilitates the design of elastic metamaterial with a prescribed target elasticity tensor via inverse homogenization methodologies. This systematic procedure, which is...

The objective of this paper is the design of three-dimensional elastic metamaterials with periodic microarchitectures. The microarchitectures of these materials are attained by following an inverse design technique jointly with an homogenization-based topology optimization algorithm. In this context, we have particularly studied the connection betw...

New tools for the design of metamaterials with periodic micro-architectures are presented. Initially, a two-scale material design approach is adopted. At the structure scale, the material effective properties and their spatial distribution are obtained through a Free Material Optimization (FMO) technique. At the micro-structure scale, the material...

A topology optimization technique based on the topological derivative and the level set function is utilized to design/synthesize the micro-structure of a pentamode material for an acoustic cloaking device. The technique provides a micro-structure consisting of a honeycomb lattice composed of needle-like and joint members. The resulting metamateria...

The paper describes the computational aspects and numerical implementation of a two-scale cohesive surface methodology developed for analyzing fracture in heterogeneous materials with complex micro-structures. This approach can be categorized as a semi-concurrent model using the representative volume element concept. A variational multi-scale formu...

INTRODUCCIÓN En la actualidad hay muchos problemas de la mecánica de fractura que aún no se hallan completamente definidos y representan grandes desafíos para los investigadores. Si un cuerpo presenta alguna falla o fisura es importante analizar cómo se distribuyen las tensiones en las cercanías de ésta y si es posible que la falla propague generan...