Experimental data for dynamically loaded viscoplastic beams with a tubular cross section where elastic strains are a significant part of the total strain are obtained for two materials, 1020 steel and 70/30 copper-nickel alloy. Maximum strain rates are 0.78 and 1.89 s−1, respectively. This work defines a successful experimental approach for obtaining dynamic data and provides results which can be used in defining failure for optimal design. A moment-curvature constitutive relation, including rate effects, is fitted to the data.

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