From the same paper as the previous 2 images.
In (b) the truss core is crushed by 0.5, 2.5, 7.5 and 10.0 per cent.
Ref. 29 is:
29. Zeng, T., Fang, D.N., Yan, S., et al.: Compressive properties of carbon epoxy composite sandwich panels with pyramidal truss core. In: Joint-Symposium on Mechanics of Advanced Materials & Structures. 11–15 August 2010, Harbin, China (2010)
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