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Mechanical response and toughening mechanisms in the synthetic hybrid composites. (a) SEM image of the structure of nacre; (b) SEM image taken during an in situ R-curve measurement of a lamellar structure; (c) Bending stress-strain curves for the Al2O3/PMMA hybrid materials mimic those of nacre and show >1% inelastic deformation before failure; (d) exceptional toughness for crack growth, similar to that of natural composites, and display significant rising R-curve behavior.[138]
