{
  "abstract": "Chiral auxetic lattices convert axial loading into node rotation, producing negative Poisson’s ratios and high energy absorption. This purely numerical study establishes a quasi-static baseline for additively manufacturable polyamide-12 (PA12) tetra-chiral lattices in which the chiral arm angle (0–90°) is treated as a design variable; no experiments were performed, and the model is verified rather than validated. Geometrically non-linear elastoplastic finite element analyses with a data-sheet-derived bilinear PA12 card and frictional self-contact were carried to 20% nominal strain and supported by mesh convergence, seeded-imperfection and friction sensitivity studies, a full-field lateral-strain measure and a refined sweep at 5° resolution. The arm angle switches the response between a stretch-dominated non-auxetic regime (0°, 50–90°) and a rotation-dominated auxetic regime (15–45°) whose lateral kinematics are not sensitive to mesh density, friction and seeded imperfections. The 15° lattice maximizes stiffness and peak force but is an isolated spike in the refined sweep, exhibits a collapse-mode bifurcation whose branch is selected by the discretization, and reaches the PA12 ductility limit after 3.5 mm of stroke. The 30° architecture sustains 9.4 mm before fracture onset and delivers the highest damage-bounded specific energy absorption of the auxetic window (820 J/kg on the baseline mesh), emerging as the design optimum.",
  "abstract_shown": true,
  "affiliations": [
    "Department of Mechanical Engineering, Osmaniye Korkut Ata University, 80000 Osmaniye, Türkiye",
    "Department of Mechanical Engineering, Faculty of Engineering, Firat University, 23119 Elazığ, Türkiye"
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 2,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Volkan Arıkan",
      "orcid": "0000-0002-6102-6584"
    },
    {
      "affs": [
        1
      ],
      "name": "Cenk Yanen",
      "orcid": "0000-0002-5092-8734"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/309dya1z9dwsn.bib",
  "cited_by": 0,
  "doi": "10.3390/polym18192427",
  "fulltext_url": "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13666711/?tool=EBI",
  "id": "309dya1z9dwsn",
  "issns": [
    "2073-4360"
  ],
  "landing_url": "https://europepmc.org/article/PMC/PMC13666711",
  "language": "eng",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2210|Cellular and Composite Structures"
    ]
  ],
  "openalex": "W7220362353",
  "pdf_url": "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13666711/pdf/?tool=EBI",
  "pmcid": "PMC13666711",
  "pmid": null,
  "published": "2026-10-01",
  "publisher": "MDPI AG",
  "ris": "https://research.draconitic.com/paper/309dya1z9dwsn.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:31Z",
      "native_id": "PMC:PMC13666711",
      "source": "europepmc",
      "url": "https://europepmc.org/article/PMC/PMC13666711"
    },
    {
      "first_seen": "2026-10-30T12:18:44Z",
      "native_id": "10.3390/polym18192427",
      "source": "crossref",
      "url": "https://www.mdpi.com/2073-4360/18/19/2427"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "issn:2073-4360",
      "subfield": "materials-polymers"
    }
  ],
  "title": "Effect of Chiral Arm Angle on the Stiffness, Auxeticity and Energy Absorption of Polyamide-12 Tetra-Chiral Lattices Under Quasi-Static Compression: A Numerical Baseline Study",
  "title_text": "Effect of Chiral Arm Angle on the Stiffness, Auxeticity and Energy Absorption of Polyamide-12 Tetra-Chiral Lattices Under Quasi-Static Compression: A Numerical Baseline Study",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:44Z",
  "url": "https://research.draconitic.com/paper/309dya1z9dwsn",
  "venue": "Polymers",
  "versions": []
}