Collapse modes in aluminium honeycomb sandwich panels under bending and impact loading

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Comparison of aluminium sandwiches for lightweight ship structures: Honeycomb vs. foam (2013, methodology): “Impact force – displacement curves measured under impact loading (honeycomb d 1⁄4 3 mm) [11].”
Three-point bending of sandwich beams with aluminum foam-filled corrugated cores (2014, background): “had been extensively studied, including lattice truss cores (corrugated plates [18–21], Y-frames [21], honeycombs [15,22,23] and pyramidal trusses [24]) and metallic [25–27] and polymeric foam cores [28].”
Lightweight sandwich structures for marine applications: a review (2021, background): “Mode II Reprinted from [29] with permission from Elsevier.”
A review of the recent trends on core structures and impact response of sandwich panels (2021, background): “Crupi et al.(221) investigated the three-point bending response of two topologies of aluminium honeycomb sandwich structures with different cell size, which found that collapse modes significantly depended on the support span distance and honeycomb cell size.”