Abstract
This paper gives details of a comprehensive dynamic mechanical analysis (DMA) material characterisation activity for all constituent layers of two modern-day thermoformed soccer balls. The resulting material data were used to define a series of viscoelastic finite element (FE) models of each ball design which incorporated the through-thickness composite material properties, including an internal latex bladder, woven fabric-based carcass and polymer based outer panels. The developed FE modelling methodology was found to accurately describe the viscoelastic kinetic energy loss characteristics apparent throughout a soccer ball impact at velocities which are typical of those experienced throughout play. The models have been validated by means of experimental impact testing under dynamic loading conditions. It was found that the viscoelastic material properties of the outer panels significantly affected ball impact characteristics, with outer panel materials exhibiting higher levels of viscous damping resulting in higher losses of kinetic energy.
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The authors would like to acknowledge EPSRC, adidas and Abaqus for their support for this project.
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Price, D.S., Jones, R., Harland, A.R. et al. Viscoelasticity of multi-layer textile reinforced polymer composites used in soccer balls. J Mater Sci 43, 2833–2843 (2008). https://doi.org/10.1007/s10853-008-2526-0
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DOI: https://doi.org/10.1007/s10853-008-2526-0