Fig. 1 Geometries of CFRP honeycomb mechanical metamaterials. ( a ) Hexagonal, ( b ) square, and ( c ) semi-re-entrant honeycombs. More about this image found in Geometries of CFRP honeycomb mechanical metamaterials. ( a ) Hexagonal, ( b...

Fig. 2 Fabrication procedure of semi-re-entrant CFRP honeycomb sandwich panel More about this image found in Fabrication procedure of semi-re-entrant CFRP honeycomb sandwich panel

Fig. 3 Experimental setup of quasi-static out-of-plane compressive loading for CFRP honeycomb specimens More about this image found in Experimental setup of quasi-static out-of-plane compressive loading for CFR...

Fig. 4 Sketch of boundary conditions of honeycomb cores and sandwich panels subjected to out-of-plane compressive loadings More about this image found in Sketch of boundary conditions of honeycomb cores and sandwich panels subjec...

Fig. 5 Sketches of the monolithic plates with various boundary conditions subjected to compressive loadings. ( a ) Case I: All edges are simply supported, ( b ) Case II: Loaded edges are simply supported and the remaining edges are fully clamped, ( c ) Case III: Loaded edges are fully clamped and ... More about this image found in Sketches of the monolithic plates with various boundary conditions subjecte...

Fig. 6 Geometries of honeycomb cells. ( a ) Hexagonal, ( b ) square and ( c ) semi-re-entrant honeycombs. More about this image found in Geometries of honeycomb cells. ( a ) Hexagonal, ( b ) square and ( c ) semi...

Fig. 7 Comparisons between analytical predictions and experimental results of stress versus strain curves, and failure modes of ( a ) hexagonal, ( b ) square, and ( c ) semi-re-entrant CFRP honeycomb cores More about this image found in Comparisons between analytical predictions and experimental results of stre...

Fig. 8 Morphology characteristics of double cell walls of CFRP hexagonal honeycomb core. ( a ) Three-dimensional morphology and ( b ) cross-section contour curves More about this image found in Morphology characteristics of double cell walls of CFRP hexagonal honeycomb...

Fig. 9 Comparisons between analytical predictions and experimental results of stress versus strain curves, and failure modes of high sandwich panels with ( a ) hexagonal, ( b ) square, and ( c ) semi-re-entrant CFRP honeycomb cores More about this image found in Comparisons between analytical predictions and experimental results of stre...

Fig. 10 Comparisons between analytical predictions and experimental results of stress versus strain curves, and failure modes of low sandwich panels with ( a ) hexagonal, ( b ) square, and ( c ) semi-re-entrant CFRP honeycomb cores More about this image found in Comparisons between analytical predictions and experimental results of stre...

Fig. 11 Strain distributions of CFRP honeycomb specimens. ( a ) High sandwich panels, and ( b ) low sandwich panels. (Note: ICS denotes the initial collapse stress). More about this image found in Strain distributions of CFRP honeycomb specimens. ( a ) High sandwich panel...

Fig. 12 Comparisons of experimental stress versus strain curves. ( a ) Hexagonal, ( b ) square, and ( c ) semi-re-entrant CFRP honeycomb cores and sandwich panels. More about this image found in Comparisons of experimental stress versus strain curves. ( a ) Hexagonal, (...

Fig. 13 Comparisons between the experimental results and analytical predictions of buckling half-wave number. ( a ) Analytical predictions of initial collapse stress versus the half-wave number, ( b ) experimental statistical method of buckling half-wave number, and ( c ) experimental results of s... More about this image found in Comparisons between the experimental results and analytical predictions of ...

Fig. 14 Morphology characteristics of imperfections of CFRP honeycombs fabricated by using the pin-slot positioning method More about this image found in Morphology characteristics of imperfections of CFRP honeycombs fabricated b...

Fig. 15 Comparisons of mechanical characteristics for CFRP honeycomb cores and sandwich panels. ( a ) Young's modulus, and ( b ) initial collapse stress. More about this image found in Comparisons of mechanical characteristics for CFRP honeycomb cores and sand...

Fig. 16 Force versus displacement curves of CFRP honeycomb cores More about this image found in Force versus displacement curves of CFRP honeycomb cores

Fig. 17 Stress versus strain curve and the energy absorption efficiency of CFRP hexagonal honeycomb core subjected to out-of-plane compressive loading More about this image found in Stress versus strain curve and the energy absorption efficiency of CFRP hex...