{
  "abstract": "A shell finite-element model of a stiffened aluminium wingbox panel, a laboratory structure shared by several experimental studies, is built with its plate-to-stiffener joints at the $78$ physical fastener positions and calibrated against measured modal data, a six-parameter sensitivity update of the substructure moduli within $\\pm20\\%$ reproducing the first five measured modes to $1.1$--$4.3\\%$ with modal-assurance values of $0.88$--$1.00$. Making the fasteners nonlinear, at equal mesh, mass and damping, shows that joint nonlinearity enters the response strongly asymmetrically. Hardening is almost invisible, at most $+1\\%$ in frequency, whereas softening or slipping the joints moves the first three resonances by $-2.1$, $-4.9$ and $-9.2\\%$, and friction removes up to $80\\%$ of the resonant peak before it recovers. Newmark integration of all $18{,}804$ degrees of freedom and a harmonic balance condensed exactly onto the joints and continued in arclength agree to $5.5\\times10^{-4}$. A projection-based nonlinear model order reduction then locates the criterion that a jointed structure imposes on a reduced basis. The binding quantity is not the linear response, which eleven vectors reproduce to better than $0.01\\%$, but the receptance of the structure between the joints, of which $126$ global eigenvectors carry about $2\\%$, and without which the reduced model overpredicts the hardening shift of the fundamental by a factor of thirty and returns a value beyond the rigid-joint limit of the panel.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.10088",
  "author_total": 2,
  "authors": [
    {
      "name": "Nikolaos D. Tantaroudas"
    },
    {
      "name": "Evangelos Papatheou"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/3544amvh4eq9y.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.10088",
  "fulltext_url": null,
  "id": "3544amvh4eq9y",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.10088",
  "language": null,
  "licence": "CC-BY-NC-SA-4.0",
  "licence_label": "CC BY-NC-SA 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
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      "arxiv",
      "cs.CE"
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      "arxiv",
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    [
      "openalex",
      "3109|Model Reduction and Neural Networks"
    ]
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  "openalex": "W7212120363",
  "pdf_url": "https://arxiv.org/pdf/2609.10088",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-09",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/3544amvh4eq9y.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:20:12Z",
      "native_id": "2609.10088",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.10088"
    }
  ],
  "subjects": [
    {
      "field": "mathematics",
      "origin": "arxiv:math-ph",
      "subfield": "mathematical-physics"
    },
    {
      "field": "mathematics",
      "origin": "arxiv:math.NA",
      "subfield": "numerical-analysis"
    }
  ],
  "title": "Joint nonlinearity in a stiffened aluminium wingbox panel and what it requires of a reduced basis",
  "title_text": "Joint nonlinearity in a stiffened aluminium wingbox panel and what it requires of a reduced basis",
  "type": "preprint",
  "updated_at": "2026-10-30T12:20:15Z",
  "url": "https://research.draconitic.com/paper/3544amvh4eq9y",
  "venue": "arXiv",
  "versions": []
}