Master trends in the elasto-viscoplastic behaviour of highly cross-linked epoxy resins

Klavzer, Nathan;Chevalier, Jérémy;Breite, Christian;Morelle, Xavier P.;Pardoen, Thomas;et.al.
(2025) Mechanics of Time Dependent Materials : an international journal devoted to the time-dependent behaviour of materials and structures — Vol. 29, n° 3, p. 68 (2025)

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Highly cross-linked epoxy resins are ubiquitous in high-performance structural applications, particularly when used as matrices for fibre-reinforced composites. The optimisation of composites requires a quantitative and predictive description of the mechanical behaviour of the matrix. To explore master trends in the mechanical response as well as to guide firstorder modelling, the complete stress-strain response of six epoxies is characterised under uniaxial compression up to large strain and fracture. A number of characteristic properties are analysed and rationalised mainly through establishing partly physical and partly empirical relationships with the ratio T/Tg of test over glass transition temperature. Among others, an enhanced Eyring-type model is identified for the yield stress and found valid for a wide range of temperatures and strain rates below Tg. The yield stress of all six epoxies is related to Tg within 10% error without any other adjustment of parameters. A similar relationship for the modulus with T/Tg also accounts for strain rate. Lastly, the failure stress and strain are found to also correlate to T/Tg in subgroups of resins with similar molecular structure, while the re-hardening modulus does not.
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Klavzer, N., Chevalier, J., Breite, C., Morelle, X. P., Swolfs, Y., & Pardoen, T. (2025). Master trends in the elasto-viscoplastic behaviour of highly cross-linked epoxy resins. Mechanics of Time Dependent Materials : an international journal devoted to the time-dependent behaviour of materials and structures, 29(3), 68. https://doi.org/10.1007/s11043-025-09804-w (Original work published 2025)