Abstract
Many natural and biomimetic platelet-matrix composites--such as nacre, silk, and clay-polymer-exhibit a remarkable balance of strength, toughness and/or stiffness, which call for a universal measure to quantify this outstanding feature given the structure and material characteristics of the constituents. Analogously, there is an urgent need to quantify the mechanics of emerging electronic and photonic systems such as stacked heterostructures. Here we report the development of a unified framework to construct universal composition-structure-property diagrams that decode the interplay between various geometries and inherent material features in both platelet-matrix composites and stacked heterostructures. We study the effects of elastic and elastic-perfectly plastic matrices, overlap offset ratio and the competing mechanisms of platelet versus matrix failures. Validated by several 3D-printed specimens and a wide range of natural and synthetic materials across scales, the proposed universally valid diagrams have important implications for science-based engineering of numerous platelet-matrix composites and stacked heterostructures.
Highlights
Many natural and biomimetic platelet–matrix composites—such as nacre, silk, and clay-polymer—exhibit a remarkable balance of strength, toughness and/or stiffness, which call for a universal measure to quantify this outstanding feature given the structure and material characteristics of the constituents
Field-effect tunnelling transistors with high On/Off ratios were recently fabricated by graphene (G) heterostructures sandwiching atomically thin hexagonal boron nitride (h-BN) or molybdenum disulfide (MoS2) sheets acting as a vertical transport barrier[21]
We facilitate a comprehensive understanding of the mechanics of platelet–matrix composites and stacked heterostructures in the shear mode via universal composition– structure–property maps
Summary
Many natural and biomimetic platelet–matrix composites—such as nacre, silk, and clay-polymer—exhibit a remarkable balance of strength, toughness and/or stiffness, which call for a universal measure to quantify this outstanding feature given the structure and material characteristics of the constituents. Validated by several 3D-printed specimens and a wide range of natural and synthetic materials across scales, the proposed universally valid diagrams have important implications for science-based engineering of numerous platelet–matrix composites and stacked heterostructures Natural materials such as nacre, spider silk, tendon and so on are primarily biocomposites that exhibit an excellent balance of mechanical properties and multi-functionality far beyond their constituents[1,2]. Given the material heterogeneity and structural variety of numerous natural and biomimetic platelet–matrix composites, there is currently no unified understanding of the interplay between various geometers and inherent material characteristics in controlling the balance of mechanical properties The latter is essentially unexplored for composites made of dissimilar platelets. We will study and compare the competing mechanisms between platelet and matrix failures as well as the failure of platelet–matrix composites with stairwise and random staggering architectures
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