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June 19, 2026Applied SciencesOpen Access

Low-Speed Impact Behavior of 3D-Printed Polylactic Acid-Based Auxetic Core Sandwich Structures Filled with Polyurethane Foams

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Authors

HÇH. ÇelikMAM. Kemal Apalak

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Overview

Randomized trial investigates impact behavior of auxetic sandwich structures in varied foam densities, indicating significant performance differences.

Key Points

  • This research aims to examine how different auxetic core geometries and polyurethane foam fillings affect the low-velocity impact behavior of sandwich structures.
  • Evaluated four auxetic core geometries: re-entrant core, tetra-chiral core, double-arrowhead core, and star-shaped core.
  • Fabricated structures using additive manufacturing in foam-unfilled, 40 density foam-filled, and 60 density foam-filled conditions.
  • Conducted low-velocity impact tests at energy levels of 6.04 and 10.74 J, analyzing impact response via digital image correlation.
  • 60DFF structures displayed significantly higher stiffness compared to other samples.
  • Foam material improved impact load distribution and damage progression.
  • Localized failure behavior was observed in foam-unfilled structures.

Cite This Study

Çelik et al. (2026) studied this question.

synapsesocial.com/papers/6a34dd1d65a5b0777af2cfafhttps://doi.org/10.3390/app16126105
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Behavior of sandwich structures with 3D-printed auxetic and non-auxetic cores under low velocity impact: Experimental and computational analysis2024 · 1 citations
  2. 2Low-velocity impact response of composite sandwich structures with hierarchical gradient foam/carbon fiber2025
  3. 3Effect of design parameters of auxetic structure core on quasi-static and low-velocity impact response of glass fiber reinforced polymer composite sandwich structures2025
  4. 4Impact of 3D printed PLA-GF core geometries on the mechanical performance of sandwich structures2026
  5. 5Effect of geometrical grading on the low-velocity impact behavior of sandwich structures with 3D-printed auxetic core materials2025