Mechanics of Bioinspired Multilayered Ceramic Composites

Reference Presenter Authors
03-036 Nima Rahbar Rahbar, N.(Worcester Polytechnic Institute); Bioinspired design is shown to be the most effective method to achieve this goal. Previous studies on the mechanical performance of biological multilayered materials such as nacre have shown that their outstanding mechanical properties are direct results of the small-scale features and optimized arrangement of the elements in their microstructure. Hence, the freeze casting technique has been recently introduced as a novel method to create a new class of bioinspired polymer/ceramic composites. However, the method is cumbersome and the mechanics that controls the overall performance of these composites is not well-known. In this talk mechanics of bioinspired multilayered samples with micron-size layers that are fabricated using the challenging freeze casting technique will be discussed. Different parameters such as solution concentration, freezing rate, and sintering temperature affect the structure, and subsequently, the mechanical performance of these multilayered materials. Moreover, in order to fully understand the underlying toughening and deformation mechanisms, a micromechanics model of the mechanical response of lamellar composites is presented. The experimental results agree well with the proposed analytical models. Fracture mechanics tests are also used to study the Resistance-Curve (R- Curve) behavior of the samples. Furthermore, important toughening mechanisms in these samples are discussed and governing equations for fiber bridging and fiber pull-out in lamellar ceramic/polymer composites are presented. Finally, detailed material design relationships are derived to identify future directions in the design of next generation structural composites.
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