The current need of technology demands the generation of light-weight, durable and energy efficient structural materials. In order to attain this goal, over the last few decades there has been an increasing trend towards understanding design guidelines existing in natural composites and to implement the same in the development of synthetic composites. Of the innumerable structural biological composites existing in Nature, the nacreous layer in the seashells has received significant attention owing to its unique architecture and exceptional mechanical properties. Over the past decade, researchers all over the globe have addressed the reasons which are responsible for this attribute, and also attempted to synthesize them in the laboratory. However from the perspective of structural application, it is imperative to understand the suitability/applicability of these type of composites, should they be subjected to a variety of loading rates. In our investigations, we have attempted to address as to why bio-inspired nacre-mimetic composites are suited for impact loading conditions. We have also tried to understand the mechanics of these type of composites when subjected to impact loading and unearth the parametric attributes that are responsible for superior resistance. Additionally, we have also tried to interpret what does it take for the nacreous layer to promote not only significant fracture resistance but at the same time attain light-weight as well. Excerpts from our investigations provide beneficial guidelines in designing tough bio-inspired composites at any length scale.
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