the influence of nanoclay on the impact damage resistance of glass fiber–epoxy composites has been investigated using high-velocity repeated ice impact tests. the incorporation of nanoclay into epoxy enhances the impact resistance of the composites. the impact of ice is a realistic scenario for composite structures such as aircraft fuselages, wing skins and fan blades and it is not a completely...

The U.S. Army projects a considerable increase in the number of operational Unmanned Ground Systems (UGS) within the next ten years. There is a need to enhance UGS capabilities to support remote Intelligence, Surveillance, Reconnaissance (ISR) operations involving the identification of High-Value Individuals (HVI). Emerging UGS capability requirements will inevitably result in new or revised tr...

This paper presents a modified form of the Walker-Anderson (W-A) model for analyzing high velocity penetration of an eroding projectile into a concrete target in which the W-A model is improved by incorporating calculations for the plastic flow field of concrete in terms of its compressibility and strain rate sensitivity under severe pressure. With the changes to and calculations of plastic fie...