Biomimicked composites have shown to be effective in reducing risk factors associated with the resistance of buildings against earthquakes. A significant amount of work is needed to determine what factors are critical in toughening composites used for homes, office buildings and other human dwellings. The effect of carbon fiber length on the mechanical properties of biomimicked composites was investigated. Composites made of cement, polymer and carbon fiber were fabricated in layers similar to the layering scheme of nacre and tested for toughness to determine the effects of fiber length. Preliminary results show an increase in the the strength of the composites with the fiber length. However, the effect is more pronounced on the increase in the fracture energy showing a linear relationship with the carbon fiber length.

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