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Not all materials show decreases in the absorbed energy with increasing crack velocity. In plexiglass the absorbed energy increases [6]. Secondary cracks seem to be responsible for this effect (Paper in preparation).
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Weichert, R., Schönert, K. About the intermittent crack extension in iron. Int J Fract 5, 353–355 (1969). https://doi.org/10.1007/BF00190965
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DOI: https://doi.org/10.1007/BF00190965