Effect of specimen geometry on the elastic characterization of particle-reinforced elastomers

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dc.contributor.authorCortazar Noguerol, Julen
dc.contributor.authorCortés Martínez, Fernando
dc.contributor.authorElejabarrieta Olabarri, María Jesus
dc.date.accessioned2026-08-07T07:02:23Z
dc.date.available2026-08-07T07:02:23Z
dc.date.issued2026-08
dc.date.updated2026-08-07T07:02:23Z
dc.description.abstractCompression- and torsion-based characterization of particle-reinforced elastomers yields geometry-dependent effective properties, limiting the reliability of material parameters used in engineering design and simulation. In this work, an experimental–modelling methodology is developed to estimate geometry-independent moduli under quasistatic and small-strain conditions. Cylindrical specimens covering a wide range of geometries and particle volume fractions are tested under compression and torsion conditions, providing the dataset for parameter identification. A phenomenological model combines particle reinforcement with geometry-dependent responses in both loading modes, showing that their interaction is not simply additive. The model is formulated to ensure simultaneous and physically consistent identification of elastic modulus, shear modulus, and Poisson's ratio. The model reproduces the measured effective properties with relative root-mean-square errors of approximately 7 % in compression, 6 % in shear and 11 % in Poisson's ratio. The resulting geometry-corrected moduli exhibit a linear increase with particle volume fraction, while Poisson's ratio slightly decreases due to stronger reinforcement in shear. A quantitative criterion is introduced to evaluate geometry-induced errors, establishing an admissible region based on a 10 % deviation threshold. The analysis shows that standard compression geometries can significantly overestimate the elastic modulus, whereas shear measurements remain more robust over a wider range of specimen shapes. For Poisson's ratio, the admissible limit lies outside practically achievable geometries. The methodology allows the estimation of moduli under quasistatic and small-strain conditions while providing practical guidelines for specimen design.en
dc.description.sponsorshipThis research has been supported by the University of Deusto Research Training Grants Program (grant reference number FPIUD_2023_07) and the Department of Education for the Research Group program IT1507-22.en
dc.identifier.citationCortazar-Noguerol, J., Cortés, F., & Elejabarrieta, M. J. (2026). Effect of specimen geometry on the elastic characterization of particle-reinforced elastomers. Polymer Testing, 161. https://doi.org/10.1016/J.POLYMERTESTING.2026.109298
dc.identifier.doi10.1016/J.POLYMERTESTING.2026.109298
dc.identifier.issn0142-9418
dc.identifier.urihttps://hdl.handle.net/20.500.14454/6481
dc.language.isoeng
dc.publisherElsevier Ltd
dc.rights© 2026 The Authors
dc.subject.otherCompression test
dc.subject.otherParticle concentration
dc.subject.otherParticle-reinforced elastomers
dc.subject.otherPoisson ratio
dc.subject.otherShape factor
dc.subject.otherTorsion test
dc.titleEffect of specimen geometry on the elastic characterization of particle-reinforced elastomersen
dc.typejournal article
dcterms.accessRightsopen access
oaire.citation.titlePolymer Testing
oaire.citation.volume161
oaire.licenseConditionhttps://creativecommons.org/licenses/by-nc-nd/4.0/
oaire.versionVoR
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