Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Multiscale modeling of a small punch test on nanostructured CP titanium
Year:2013
Research Areas
  • Construction materials
Information
Abstract
Small punch (SP) test techniques are typically used to study the mechanical properties of materials or components from miniature size specimens. This kind of test was originally developed to assess ductility loss in steel caused by irradiation or thermal treatment, particularly when the amount of metal was limited, but it soon proved to be a powerful method to estimate several properties such as the elastic modulus, yield stress or fracture toughness. From the mechanical point of view, SP is a relatively complex process in which the specimen is subjected to four stages: (I) elastic bending deformation; (II) plastic bending deformation; (III) membrane stretching; and (IV) plastic instability (with or without fracture). Beginning in the second stage, changes in the shape and orientation of the grains are highly relevant for the evolution of the mechanical properties. In this study, a multiscale model has been used to predict the texture evolution of a nanostructured commercially pure (CP) titanium specimen during a small punch test. The punch test is modeled by means of a FE simulation in which the behavior at each material point is obtained by the multiscale model for polycrystal plasticity developed by Segurado et al. The model considers explicitely a polycrystalline agrgegate on each point with their corresponding initial grain orientations and properties. The macroscopic fields at each point and stage of the simulation are related with the microstructure through the VPSC model by Lebensohn and Tome that provides the actual stiffness and plastic strain rate. Thanks to the multiscale procedure, the microstructural changes (grain elongation, hardening or texture evolution) are coupled with the mechanical response point-to-point leading to a more realistic and accurate response. Additionally, the model developed was able to reproduce both the macroscopic response of a small punch test (force-displacement curves and shape of punch) and the microscopic information such as the particular texture for any point located though the specimen
International
Si
Congress
Computational Plasticity XII. Fundamentals and Applications (COMPLAS XII)
960
Place
Barcelona
Reviewers
Si
ISBN/ISSN
978-84-941531-5-0
Start Date
03/09/2013
End Date
05/09/2013
From page
0
To page
0
Participants
  • Autor: Alvaro Ridruejo Rodriguez (UPM)
  • Autor: Javier Segurado Escudero (UPM)
  • Autor: Ilchat Sabirov (Instituto IMDEA-Materiales)
  • Autor: Fco. Javier Llorca Martinez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Materiales Estructurales Avanzados y Nanomateriales
  • Centro o Instituto I+D+i: CENTRO INVEST. MATERIALES ESTRUCTURALES (CIME)
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