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  4. 2D numerical simulation of auxetic metamaterials based on force and deformation consistency
 
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2022
Journal Article
Title

2D numerical simulation of auxetic metamaterials based on force and deformation consistency

Abstract
This work showcases a novel phenomenological method to create predictive simulations of metallic lattice structures. The samples were manufactured via laser powder bed fusion (LPBF). Simulating LPBF-manufactured metamaterials accurately presents a challenge. The printed geometry is different from the CAD geometry the lattice is based on. The reasons are intrinsic limitations of the printing process, which cause defects such as pores or rough surfaces. These differences result in material behavior that depends on the surface/volume ratio. To create predictive simulations, this work introduces an approach to setup a calibrated simulation based on a combination of experimental force data and local displacements obtained via global Digital Image Correlation (DIC). The displacement fields are measured via Finite Element based DIC and yield the true local deformation of the structure. By exploiting symmetries of the geometry, a simplified parametrized simulation model is created. The simulation is calibrated via Response Surface Methodology based on nodal displacements from FE-DIC combined with the experimental force/displacement data. This method is used to create a simulation of an anti-tetrachiral, auxetic structure. The transferability and accuracy are discussed, as well as the possible extension into 3D space.
Author(s)
Roth, Antonina
INATECH, Albert-Ludwigs-Universität Freiburg
Ganzenmüller, Georg  
Fraunhofer-Institut für Kurzzeitdynamik Ernst-Mach-Institut EMI  
Gutmann, Florian  
Fraunhofer-Institut für Kurzzeitdynamik Ernst-Mach-Institut EMI  
Jakkula, Puneeth
INATECH, Albert-Ludwigs-Universität Freiburg
Hild, François
University Paris-Saclay, CentraleSupélec, ENS Paris-Saclay, CNRS, LMPS-Laboratoire de Mécanique Paris-Saclay
Pfaff, Aron  
Fraunhofer-Institut für Kurzzeitdynamik Ernst-Mach-Institut EMI  
Yin, Kaiyang
IMTEK, Albert-Ludwigs-Universität Freiburg
Eberl, Chris
Hiermaier, Stefan  
INATECH, Albert-Ludwigs-Universität Freiburg
Journal
Materials  
Open Access
DOI
10.3390/ma15134490
Language
English
Fraunhofer-Institut für Kurzzeitdynamik Ernst-Mach-Institut EMI  
Keyword(s)
  • additive manufacturing

  • metals

  • lattice structure

  • auxetic

  • simulation model

  • DIC

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