Abstract
Because of their structure, natural fibers exhibit nonlinear viscoelastic behavior. Thermoset resins also behave in a similar way. With the increase in structural applications of bio-based composites, the long-term creep behavior of these materials becomes a significant issue. Time-Temperature superposition (TTS) provides a useful tool to overcome the challenge of needing a long time to perform creep tests. TTS principle assumes that the effect of temperature and time are equivalent when considering the creep behavior. In this study, frequency scans of flax/VE composites were obtained at different temperatures and storage modulus, loss modulus and tan δ were recorded. Application of horizontal and vertical shift factors to all three viscoelastic functions were studied. In addition, short-term strain creeps at different temperatures were measured and curves were shifted both with only horizontal, and with both horizontal and vertical shift factors. Resulting master curves were compared with a 24-h creep test and two creep models. Findings revealed that use of both horizontal and vertical shift factors will result in a smoother master curve for viscoelastic functions, while use of only horizontal shift factors for creep data provides an acceptable creep strain master curve. Consequently flax/VE composites can be considered as thermorheologically complex materials.
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Amiri, A., Ulven, C. (2017). Bio-based Composites as Thermorheologically Complex Materials. In: Antoun, B., et al. Challenges in Mechanics of Time Dependent Materials, Volume 2. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-41543-7_7
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