Analytical models versus experimental results for composites containing nanoclay as secondary reinforcement under high velocity impact

摘要

This study compares some analytical models on high velocity impact behaviour of composite materials with that of experimental results from high velocity impact of hemispherical nose projectiles on nanoclay-filled composite plates in particular, assessing current models to account for the presence of nanoclay in polymer composites under such loading. Nanocomposites were prepared in 0,1.5 and 3 wt%. The nanoclay-filled polyester resin was then utilised to manufacture laminated composite panels in four, eight and 12 layers using 400 g/m~2 glass fibre woven roving via hand lay-up method. Transmission electron microscopy and X-ray diffraction confirmed intercalation and exfoliation of the nanoclay in the polyester resin system. Five models were selected for assessment. Comparison of predicted ballistic limit velocity (velocity at which the projectile remains in the composite target) with that of experimental results showed close correlation in all thickness for models that incorporated projectile nose geometry. A simple empirical equation is derived as a function of polymer laminate thickness and flexural modulus of polymer nanocomposite laminates, which varies with nanoclay content in polymer composite laminates for predicting ballistic limit velocity.