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Lat. Am. j. solids struct. vol.11 número9

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Figure 1   (a) A sandwich beam impacted by a mass; (b) Simplified rigid-perfectly plastic beam-spring model.
Figure 2   Typical dynamic stress-strain curves for the foam. The red line corresponds to rigid perfectly-plastic-locking (RPPL) model
Figure 3   Experimental results of impact failure modes with respect to load intensity (Wang, et al., 2011)
Figure 5   (a) Velocity profile of the back beam in phase I; (b) a free body diagram of the left half back beam in phase I; (c) velocity  profile of the back beam in phase II; (d) a free body diagram of the left half back beam in phase II
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