Coupled systems mechanics

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Assessment of DVC measurement uncertainty on GFRPs with various fiber architectures

  • Bartulovic, Ante (NETEC - Institute for Nuclear Technology) ;
  • Tomicevic, Zvonimir (Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb) ;
  • Bubalo, Ante (Yazaki Europe Limited) ;
  • Hild, Francois (Universite Paris-Saclay, CentraleSupelec, ENS Paris-Saclay, CNRS, LMPS - Laboratoire de Mecanique)
  • Received : 2021.07.31
  • Accepted : 2021.10.11
  • Published : 2022.02.25
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Abstract

The comprehensive understanding of the fiber reinforced polymer behavior requires the use of advanced non-destructive testing methods due to its heterogeneous microstructure and anisotropic mechanical proprieties. In addition, the material response under load is strongly associated with manufacturing defects (e.g., voids, inclusions, fiber misalignment, debonds, improper cure and delamination). Such imperfections and microstructures induce various damage mechanisms arising at different scales before macrocracks are formed. The origin of damage phenomena can only be fully understood with the access to underlying microstructural features. This makes X-ray Computed Tomography an appropriate imaging tool to capture changes in the bulk of fibrous materials. Moreover, Digital Volume Correlation (DVC) can be used to measure kinematic fields induced by various loading histories. The correlation technique relies on image contrast induced by microstructures. Fibrous composites can be reinforced by different fiber architectures that may lead to poor natural contrast. Hence, a priori analyses need to be performed to assess the corresponding DVC measurement uncertainties. This study aimed to evaluate measurement resolutions of global and regularized DVC for glass fiber reinforced polymers with different fiber architectures. The measurement uncertainties were evaluated with respect to element size and regularization lengths. Even though FE-based DVC could not reach the recommended displacement uncertainty with low spatial resolution, regularized DVC enabled for the use of fine meshes when applying appropriate regularization.

Keywords

Acknowledgement

This work was conducted within the FULLINSPECT project supported by the Croatian Science Foundation (UIP-2019-04-5460 Grant).

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