Article ID Journal Published Year Pages File Type
1561059 Computational Materials Science 2014 6 Pages PDF
Abstract
Fracture behavior of SiC matrix nanocomposites reinforced by SiC nanofiber coated with amorphous carbon (a-C) coatings is studied via molecular dynamics simulations. The a-C coating plays a significant role in the tensile strength, and fracture energy of the nanocomposites. With increasing thickness of the a-C coating, the failure behavior of nanocomposites transitions from brittle fracture to a non-catastrophic mode of ductile performance while the tensile strength increases. An introduction of appropriate functionally-graded a-C coating can significantly enhance nanofiber pullout and thus pullout energy by an order of magnitude. Our results suggest that material design directions - coating thickness and the functionally-graded coating - are all efficient approaches for engineering nanoscale SiC/SiC composites for high strength and toughness.
Related Topics
Physical Sciences and Engineering Engineering Computational Mechanics
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