Shear Band Formation and Crack Growth in Nanostructured Composite Interfaces

Abstract

Nanostructured composites have emerged as promising materials for advanced 
engineering applications due to their enhanced mechanical properties, such as high strength and 
improved ductility. However, the formation of shear bands and subsequent crack growth at 
interfaces pose significant challenges to their structural integrity. This paper investigates the 
mechanisms underlying shear band initiation, propagation, and interaction with cracks in 
nanostructured composite interfaces. Through a combination of computational modeling and 
theoretical analysis, we explore the roles of interface microstructure, layer thickness, grain size 
gradients, and interfacial shear strength in modulating deformation behavior. Key findings reveal 
that gradient nano-grained structures promote shear band delocalization, thereby suppressing rapid 
crack growth and enhancing overall toughness. The study highlights strategies for interface design 
to mitigate failure modes, providing insights for developing durable nanostructured composites.