The paper evaluates the Mode II interfacial fracture toughness and shear strength of fiber/PLLA and fiber/epoxy composites using a double shear stress method with a 3 fibers model.
Alkali treatment enhances fiber surface roughness, improving the composites' interfacial properties and leading to higher toughness and shear strength for fiber/epoxy compared to fiber/PLLA.
Factors like matrix length, fiber spacing, fiber diameter, and bonding area impact interfacial fracture characteristics, with longer treatment durations further increasing these properties.