Abstract
In-plane shear and mode‒II interlaminar fracture toughness properties of three-dimensional nanostitch para-aramid/phenolic composites were experimentally studied. Introducing the nanostitching yarn into nanocomposites slightly enhanced their shear strengths and the interlaminar fracture toughness (GIIC) due to the through-the-thickness reinforcement which was provided by micro filament TOWs and nanotubes. In-plane shear failure mode was predominantly irregular shear hackle marks in the phenolic resin and fibrillar peeling on the fiber due to in-plane shear deformation. However, the failure mode of interlaminar fracture toughness was mainly shear hackles in the interlayer region of the nanostitch composite. Carbon nanotubes in the phenolic resin and filament TOWs probably reduced the stress clustering via friction-debonding-pull-out-sliding as a form of stick-slip. These failure mechanisms probably arrested the crack growth and suppressed delamination in the through-the-thickness fiber reinforced zone. As a result, nanostitch aramid composite showed damage tolerance characteristic.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
