J.J. Roa

ORCID: 0000-0002-7440-0766
Publications
Citations
Views
---
Saved
---
About
Contact & Profiles
Research Areas
  • Metal and Thin Film Mechanics
  • Advanced materials and composites
  • Advanced ceramic materials synthesis
  • Diamond and Carbon-based Materials Research
  • Microstructure and Mechanical Properties of Steels
  • Advancements in Solid Oxide Fuel Cells
  • Orthopaedic implants and arthroplasty
  • Metal Alloys Wear and Properties
  • Physics of Superconductivity and Magnetism
  • Electronic and Structural Properties of Oxides
  • Hydrogen embrittlement and corrosion behaviors in metals
  • Bone Tissue Engineering Materials
  • Titanium Alloys Microstructure and Properties
  • Advanced Surface Polishing Techniques
  • Dental materials and restorations
  • Microstructure and mechanical properties
  • Additive Manufacturing and 3D Printing Technologies
  • Tunneling and Rock Mechanics
  • Force Microscopy Techniques and Applications
  • High-Temperature Coating Behaviors
  • Injection Molding Process and Properties
  • Intermetallics and Advanced Alloy Properties
  • Fuel Cells and Related Materials
  • Magnetic properties of thin films
  • Additive Manufacturing Materials and Processes

Universitat Politècnica de Catalunya
2015-2024

Polytechnic University of Puerto Rico
2022

Barcelona Graduate School of Mathematics
2020

Universitat de Barcelona
1996-2016

Université de Poitiers
2011-2013

Centre National de la Recherche Scientifique
2011-2012

École Nationale Supérieure de Mécanique et d'Aérotechnique
2011-2012

Institut Pprime
2011-2012

Institut de Nanociència i Nanotecnologia de la Universitat de Barcelona
2007-2008

Hy-Line (United States)
2005

This paper aims to analyse the mechanical properties response of polylactic acid (PLA) parts manufactured through fused filament fabrication. The influence six manufacturing factors (layer height, width, fill density, layer orientation, printing velocity, and infill pattern) on flexural resistance PLA specimens is studied an L27 Taguchi experimental array. Different geometries were tested a four-point bending machine rotating machine. From first phase, optimal set parameters deriving in...

10.3390/ma12233859 article EN Materials 2019-11-22

Metastable austenitic stainless steels (MASS) are widely used in various industrial applications due to their exceptional compromise between mechanical properties and corrosion resistance. However, the of these materials can be further enhanced by surface treatments. This paper reviews treatment methodologies improve MASS, with particular attention laser The effects treatments on microstructure chemical composition thermal affected zone MASS discussed, impact material’s properties, such as...

10.3390/met13071268 article EN cc-by Metals 2023-07-14

10.1016/j.msea.2015.05.079 article EN Materials Science and Engineering A 2015-06-24

In the last years, Atomic Force Microscopy (AFM) has become a powerful tool not only to study surface morphology but also nanomechanics of all kind samples. this paper, applicability technique is reviewed and its basic aspects operation, advantages drawbacks using AFM probe as picoindenter (Force Spectroscopy mode, FS-AFM) are discussed. The patents concerning picoindentation measurements discussed in text special attention paid performed on hard materials ceramics, they have been thoroughly...

10.2174/187221011794474985 article EN Recent Patents on Nanotechnology 2011-01-01

10.1016/j.ijrmhm.2014.07.027 article EN International Journal of Refractory Metals and Hard Materials 2014-08-02

This article focuses on a systematic study of Ti-6Al-4V alloy in order to extensively characterize the main mechanical properties at macro-, micro- and submicrometric length scale under different stress fields. Hardness, elastic modulus, true stress–strain curves strain-hardening exponent are correlated with intrinsic α- β-phases that constitute this alloy. A characterization process followed, considering anisotropic effect both orthogonal crystallographic directions, as well determining for...

10.3390/met11010104 article EN cc-by Metals 2021-01-07
Coming Soon ...