Layered composites subject to impacts can fail by delamination, i.e. by debonding between laminae, if the stress waves cause damaging phenomena to take place mainly within the resin-enriched interlaminar phases. To simulate delamination at the structural level, processes dissipating energy are lumped onto fictitious zero-thickness interlaminar surfaces, and softening interface constitutive laws...

The Bouligand structure is a typical helicoidal architecture found in various crustaceans which each layer rotates by small angle relative to the adjacent one. We present theoretical analysis relate rotation pitch mechanical performance (interlaminar shear property this case) of laminas mimicking architecture. For given laminate, there exists an optimal that yields lowest stress. Theoretical mo...

Increasing fuel prices and emission norms have favoured the automobile man- ufactures to use of lightweight materials. Land fill regulations imposed by many environmental governing agencies encourage products which will decompose easily or require lesser energy for recycling. In this scenario an attempt has been made in work develop natural fiber hybrid composites with synthetic fibers address ...

Preparation of E-glass/waterborne epoxy prepregs containing natural nanoclay and properties of their composites are presented. Prepregs were prepared by wetting randomly oriented, chopped glass fiber preforms with aqueous dispersion of EpiRez 3522-W-60 resin, dicyandiamide, 2-methylimidazole and natural nanoclay (Cloisite Naþ). The nanoclay content of the aqueous dispersion was adjusted to yiel...

The effect of nanoclay content on the properties of glass fibre reinforced, waterborne epoxy laminates is investigated. Fourteen ply nanocomposite laminates containing 0, 0?1, 0?2, 0?5, 1 and 2 wt-% cloisite Na nanoclay are fabricated by a hot press. The interlaminar shear strength, flexural strength and flexural stiffness of the fabricated nanocomposites are characterised. In addition, the the...

Failures in composite materials occur mainly due to interlaminar fracture, also called delamination, between laminates. This indicates that characterizing interlaminar fracture toughness is the most effective factor in the fracture of composite materials. This study reports investigation on mixed-mode interlaminar fracture behaviour in woven carbon fibre/polyetherimide (CF/PEI) thermoplastic co...

Turbine blades form the main component for energy generation in renewable technologies such as wind and tidal energy. Non-crimp fabric (NCF) based fibre reinforced composite materials, with E-glass carbon fibres have been widely used materials blades. However, sustainable composites using naturally derived basalt, are being developed to reduce environmental impact. Basalt require no chemical ad...

The objective of this manuscript is to develop, for the first time, a mathematical model prediction buckling, postbuckling, and nonlinear bending imperfect bio-inspired helicoidal composite beams with rotation angle. equilibrium integrodifferential equations (curved) are derived from Euler–Bernoulli kinematic assumption. differential integral quadrature method (DIQM) Newton-iterative employed e...