{
  "abstract": "This study investigates the mechanical and thermomechanical response of quartz-fibre-reinforced polymer (QFRP) sandwich structures incorporating additively manufactured gyroid cores. Three core variants were considered under the same nominal gyroid topology and 28% infill setting: chopped-carbon-fibre-reinforced polyphthalamide (PPA-CF), chopped-carbon-fibre-reinforced ONYX, and ONYX incorporating additional continuous carbon-fibre reinforcement (ONYX-R). Identical QFRP face sheets manufactured from woven quartz-fibre/cyanate-ester prepreg were co-cured directly onto the printed cores without a separate adhesive film. The resulting sandwich structures were characterized by flatwise compression, three-point bending, and dynamic mechanical analysis (DMA). Under flatwise compression, QFRP-ONYX-R exhibited the highest yield strength, 12.45 ± 0.16 MPa, followed by QFRP-PPA-CF at 11.70 ± 0.10 MPa, whereas QFRP-ONYX yielded at 2.00 ± 0.09 MPa. QFRP-PPA-CF exhibited the highest nominal maximum bending stress (131.55 ± 3.50 MPa) and apparent bending modulus (7.32 ± 0.07 GPa), while QFRP-ONYX-R showed an intermediate flexural response and QFRP-ONYX exhibited the greatest deformation capacity before break. DMA revealed a strong dependence of the apparent structural response on core configuration. QFRP-PPA-CF exhibited the highest storage modulus, approximately 8.4 GPa at 30 °C, and retained approximately 1.9–2.0 GPa at 160 °C. QFRP-ONYX-R displayed intermediate stiffness but the highest principal tan δ response, with peaks of 0.135–0.150 at approximately 97–100 °C, whereas QFRP-ONYX exhibited the lowest storage and loss moduli. Overall, the results show that, under a nominally similar gyroid architecture, core material and reinforcement strategy strongly modify compressive yielding, bending behaviour, apparent thermomechanical stiffness, and damping in QFRP-faced sandwich structures.",
  "abstract_shown": true,
  "affiliations": [
    "Composite Materials Laboratory for Aeronautical Field, Romanian Research & Development Institute for Gas Turbines—COMOTI, 220D Iuliu Maniu Av., 061126 Bucharest, Romania",
    "Mechanical Engineering, Mechatronics and Robotics Department, Mechanical Engineering Faculty, “Gheorghe Asachi” Technical University of Iasi, 700050 Iasi, Romania"
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 9,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Vlad Buga"
    },
    {
      "affs": [
        0
      ],
      "name": "Teodor Adrian Badea",
      "orcid": "0000-0002-7772-1207"
    },
    {
      "affs": [
        0
      ],
      "name": "Madalina-Andreea Mustareata"
    },
    {
      "affs": [
        0
      ],
      "name": "Alexandru Ciubotariu"
    },
    {
      "affs": [
        0
      ],
      "name": "Raluca Maier",
      "orcid": "0000-0001-6792-4425"
    },
    {
      "affs": [
        0
      ],
      "name": "Andrei Timonia"
    },
    {
      "affs": [
        0
      ],
      "name": "Laurentiu Petre"
    },
    {
      "affs": [
        1
      ],
      "name": "Ciprian Ionuț Morăraș",
      "orcid": "0000-0001-6300-2255"
    },
    {
      "affs": [
        1
      ],
      "name": "Viorel Goanță",
      "orcid": "0000-0002-1693-5076"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1hmzwgbc80pbk.bib",
  "cited_by": 0,
  "doi": "10.3390/polym18202603",
  "fulltext_url": "https://europepmc.org/articles/PMC13709303",
  "id": "1hmzwgbc80pbk",
  "issns": [
    "2073-4360"
  ],
  "landing_url": "https://www.mdpi.com/2073-4360/18/20/2603",
  "language": "eng",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2210|Cellular and Composite Structures"
    ]
  ],
  "openalex": "W7223174399",
  "pdf_url": "https://europepmc.org/articles/PMC13709303?pdf=render",
  "pmcid": "PMC13709303",
  "pmid": "42942723",
  "published": "2026-10-21",
  "publisher": "MDPI AG",
  "ris": "https://research.draconitic.com/paper/1hmzwgbc80pbk.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:44Z",
      "native_id": "10.3390/polym18202603",
      "source": "crossref",
      "url": "https://www.mdpi.com/2073-4360/18/20/2603"
    },
    {
      "first_seen": "2026-10-30T12:22:12Z",
      "native_id": "MED:42942723",
      "source": "europepmc",
      "url": "https://europepmc.org/article/MED/42942723"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "issn:2073-4360",
      "subfield": "materials-polymers"
    }
  ],
  "title": "Mechanical and Thermomechanical Response of Co-Cured QFRP Sandwich Structures with Additively Manufactured Fibre-Reinforced Gyroid Cores",
  "title_text": "Mechanical and Thermomechanical Response of Co-Cured QFRP Sandwich Structures with Additively Manufactured Fibre-Reinforced Gyroid Cores",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:22:12Z",
  "url": "https://research.draconitic.com/paper/1hmzwgbc80pbk",
  "venue": "Polymers",
  "versions": []
}