Abstract
The influence of glass transition temperature (Tg) on the high velocity (>100 m/s) impact performance was investigated for a model thermosetting resin composite system. Plain weave S-2 glass composite panels were fabricated using VARTM and an epoxy resin cured with a polyetheramine curing agent. Overall, the energy absorption for the composite remained approximately constant over a broad testing temperature (T) range. The damage area caused by high-strain rate delamination, however, showed remarkable dependence on the glass transition temperature when plotted against T-Tg. The damage area was high in the glassy state (low T-Tg values) and decreased as the resin traversed its Tg into the rubbery region. Impacted samples showed that an increase in back face deflection correlated to lower damage areas and a paradigm shift in energy absorption mechanisms. These results illustrate the critical importance of the temperature dependent viscoelastic behavior on the impact properties of composites.
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Research was sponsored by the Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF-18-2-0304. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein.
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Patterson, B.A., Busch, C., Masser, K.A., Knorr, D.B. (2021). Role of Glass Transition Temperature on Energy Absorption Mechanisms in High Strain Rate Impact Performance of Fiber Reinforced Composites. In: Kramer, S.L., Tighe, R. (eds) Thermomechanics & Infrared Imaging, Inverse Problem Methodologies and Mechanics of Additive & Advanced Manufactured Materials, Volume 7. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-030-59864-8_16
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