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Experimental and theoretical characterization of bamboo's transverse viscoelastic–plastic behavior.

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Τίτλος: Experimental and theoretical characterization of bamboo's transverse viscoelastic–plastic behavior.
Συγγραφείς: Patiño, Carlos1 (AUTHOR) carlos.arroyo@correounivalle.edu.co, Gomez, Daniel1 (AUTHOR) daniel.gomez@correounivalle.edu.co, Garcia, Jose J.1 (AUTHOR) jose.garcia@correounivalle.edu.co
Πηγή: Journal of Materials Science. Aug2026, Vol. 61 Issue 29, p21612-21630. 19p.
Θεματικοί όροι: *Viscoelasticity, *Material plasticity, *Stress relaxation tests, *Rheology, *Digital image correlation, *Finite element method, *Compressive force, *Bamboo
Περίληψη: Bamboo's rapid growth, high axial mechanical strength comparable to that of low-carbon steels, and affordability make it a promising sustainable material for structural applications. However, its inherent heterogeneity, anisotropy, plasticity, and complex time-dependent response present significant challenges for modeling, design, and construction. Particularly, the viscoelastic–plastic behavior under sustained transverse compression remains poorly understood. This study presents a combined experimental–theoretical characterization of this behavior. Stress relaxation experiments were conducted on arc-shaped and hexahedral specimens subjected to 5–20% circumferential deformations. A new rheological model incorporating plastic effects via springs, dashpots, and a friction element was developed and showed strong agreement with experimental data ( R 2 =0.83–0.97). Plastic effects were evident across all strain levels, indicated by a 75–80% reduction in stiffness during loading. At 20% strain, pronounced damage was observed, including lateral material ejection, fiber extrusion, crushing, and internal cracking. Finite element models were used to verify the accuracy of simplified formulas for stress and strain. Digital image correlation analysis confirmed the generation of both plastic and viscoelastic deformation mechanisms. In arc-shaped specimens, the effective elastic modulus ranged from 149.5 to 195.2 MPa, while the yield stress varied from 4.9 to 6.2 MPa. Hexahedral specimens exhibited significant reductions in elastic modulus and yield stress, likely due to the removal of critical outer layers. This work demonstrates that accurate modeling of bamboo under transverse compression must account for both viscoelastic and plastic effects. Hence, this research provides a critical foundation for the design of metal-clamp connections and the optimization of densification processes. [ABSTRACT FROM AUTHOR]
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  – Url: https://dx.doi.org/doi:10.1007/s10853-026-12795-9
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  – Url: https://resolver.ebsco.com/c/fiv2js/result?sid=EBSCO:asx&genre=article&issn=00222461&ISBN=&volume=61&issue=29&date=20260801&spage=21612&pages=21612-21630&title=Journal of Materials Science&atitle=Experimental%20and%20theoretical%20characterization%20of%20bamboo%27s%20transverse%20viscoelastic%E2%80%93plastic%20behavior.&aulast=Pati%C3%B1o%2C%20Carlos&id=DOI:10.1007/s10853-026-12795-9
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  Data: Experimental and theoretical characterization of bamboo's transverse viscoelastic–plastic behavior.
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  Data: <searchLink fieldCode="AR" term="%22Patiño%2C+Carlos%22">Patiño, Carlos</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> carlos.arroyo@correounivalle.edu.co</i><br /><searchLink fieldCode="AR" term="%22Gomez%2C+Daniel%22">Gomez, Daniel</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> daniel.gomez@correounivalle.edu.co</i><br /><searchLink fieldCode="AR" term="%22Garcia%2C+Jose+J%2E%22">Garcia, Jose J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jose.garcia@correounivalle.edu.co</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Materials+Science%22">Journal of Materials Science</searchLink>. Aug2026, Vol. 61 Issue 29, p21612-21630. 19p.
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– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Bamboo's rapid growth, high axial mechanical strength comparable to that of low-carbon steels, and affordability make it a promising sustainable material for structural applications. However, its inherent heterogeneity, anisotropy, plasticity, and complex time-dependent response present significant challenges for modeling, design, and construction. Particularly, the viscoelastic–plastic behavior under sustained transverse compression remains poorly understood. This study presents a combined experimental–theoretical characterization of this behavior. Stress relaxation experiments were conducted on arc-shaped and hexahedral specimens subjected to 5–20% circumferential deformations. A new rheological model incorporating plastic effects via springs, dashpots, and a friction element was developed and showed strong agreement with experimental data ( R 2 =0.83–0.97). Plastic effects were evident across all strain levels, indicated by a 75–80% reduction in stiffness during loading. At 20% strain, pronounced damage was observed, including lateral material ejection, fiber extrusion, crushing, and internal cracking. Finite element models were used to verify the accuracy of simplified formulas for stress and strain. Digital image correlation analysis confirmed the generation of both plastic and viscoelastic deformation mechanisms. In arc-shaped specimens, the effective elastic modulus ranged from 149.5 to 195.2 MPa, while the yield stress varied from 4.9 to 6.2 MPa. Hexahedral specimens exhibited significant reductions in elastic modulus and yield stress, likely due to the removal of critical outer layers. This work demonstrates that accurate modeling of bamboo under transverse compression must account for both viscoelastic and plastic effects. Hence, this research provides a critical foundation for the design of metal-clamp connections and the optimization of densification processes. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1007/s10853-026-12795-9
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 19
        StartPage: 21612
    Subjects:
      – SubjectFull: Viscoelasticity
        Type: general
      – SubjectFull: Material plasticity
        Type: general
      – SubjectFull: Stress relaxation tests
        Type: general
      – SubjectFull: Rheology
        Type: general
      – SubjectFull: Digital image correlation
        Type: general
      – SubjectFull: Finite element method
        Type: general
      – SubjectFull: Compressive force
        Type: general
      – SubjectFull: Bamboo
        Type: general
    Titles:
      – TitleFull: Experimental and theoretical characterization of bamboo's transverse viscoelastic–plastic behavior.
        Type: main
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          Name:
            NameFull: Patiño, Carlos
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          Name:
            NameFull: Gomez, Daniel
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            NameFull: Garcia, Jose J.
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          Dates:
            – D: 01
              M: 08
              Text: Aug2026
              Type: published
              Y: 2026
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              Value: 00222461
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              Value: 61
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              Value: 29
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            – TitleFull: Journal of Materials Science
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