Designing Architectured Materials: Evolution vs. Intelligent Design
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There is a strong demand for new paradigms of design and development of advanced high-performance structural materials with high strength and durability that are low-cost and renewable with novel combinations of properties. Yet, most of these applications require high-performance materials that are not only stiff and strong for structural purposes, but also they need to be tough and capable of absorbing energy to avoid catastrophic failure under extreme events. Unfortunately, most engineering materials have an inverse relation between these desired properties. By natural selection, Nature has evolved, through millions of years, efficient strategies to synthesize materials that often exhibit exceptional mechanical properties that significantly break the trade-offs often achieved by man-made materials. In fact, most biological composite materials achieve higher toughness without sacrificing stiffness and strength comparing to typical engineering material. Interrogating how Nature employs these strategies and decoding the structure-function relationship of these materials is a challenging task that requires knowledge about the actual loading and environmental conditions of the material in their natural habitat, as well as a complete characterization of their constituents and hierarchical ultrastructure through the use of modern tools such as in-situ electron microscopy, small-scale mechanical testing capabilities, additive manufacturing, and advanced multiscale numerical models. In turn, this provides the necessary tools for the design and fabrication of novel architectured materials with remarkable properties. I will particularly focus my talk on the convergent evolution of impact resistant naturally occurring materials and how 3D printing, analytical/computational modeling and experimental testing can successfully be combined to evaluate some important hypotheses about the key morphological features of the microstructure and most important toughening mechanisms that are unique in these hierarchical materials.
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Math 175, Purdue University, West Lafayette, IN