Effect of specimen geometry on the elastic characterization of particle-reinforced elastomers
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Fecha
2026-08
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Elsevier Ltd
Resumen
Compression- 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.
Palabras clave
Compression test
Particle concentration
Particle-reinforced elastomers
Poisson ratio
Shape factor
Torsion test
Particle concentration
Particle-reinforced elastomers
Poisson ratio
Shape factor
Torsion test
Descripción
Materias
Cita
Cortazar-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