The dynamic response of a commercially important epoxy resin (RTM 6) has beenstudied using plate impact experiments in the impact velocity regime of 80–960m/s. Both longitudinal and lateral manganin stress gauges were employed to studythe development of orthogonal components of stress both during and after shockarrival. In light of recent work raising doubts about the interpretation oflateral gauge data, lateral response within the RTM 6 resin was also used toinvestigate the physical phenomena being measured by the embedded lateralgauges. US–uP and rX–uP Hugoniot relationships were in good agreement with datafor similar polymer materials from the literature. Derivation of shear strengthbehaviour both during and after shock arrival showed evidence of strengtheningbehind the shock front, attributed to compression of the cross-linked epoxyresin polymer chains. Comparison of the change in lateral stress behind theshock to the behaviour of an epoxy resin possessing a similar US–uP Hugoniotfrom the literature showed a different response; likely attributable to enhancedcross-linking present in this second resin. This result suggests that theembedded lateral gauges were, at least in part, measuring a physical responsebehind the shock within the resin. A Hugoniot elastic limit of 0.88 ± 0.04 GPawas derived and found to be of the same order of magnitude as results foundelsewhere for similar m
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