References 24 and 27 are:
24. Steeves CA and Fleck NA. Collapse mechanisms of sandwich beams with composite faces and a foam core, loaded in three-point bending. Part II: experimental investigation and numerical modelling. International Journal of Mechanical Sciences, 2004; 46: 585–608.
27. McCormack TM, Miller R, Kesler O and Gibson LJ. Failure of sandwich beams with metallic foam cores. International Journal of Solids and Structures, 2001; 38: 4901–4920.
From the same paper as the previous 2 images.
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