Michael R Wisnom

TL;DR: In this article, the use of polycarbonate, a high strain-to-failure matrix, was used in a pseudo-ductile composite design and compared to a high performance thermoset fiber composite containing an epoxy resin.

TL;DR: In this paper, the acoustic emission (AE) signals emitted from pitting corrosion on 316L stainless steel plate samples were used as the input into a model of an AE corrosion detection system in a larger scale structure.

TL;DR: In this paper, the authors investigated the magnetic and magneto-impedance properties of Fe-based nanocomposite materials and found that the Al-containing sample possesses superior magnetic softness and giant magnetoimpedances (GMI) effect over the Al free counterpart.

Abstract: The Overheight Compact Tension (OCT) specimen has been designed to characterise the damage process in large composite structures. In particular it allows for stable crack propagation ahead of the initial machined notch. Previous work on OCT tests has characterized typical load vs. pin opening displacement (POD) curves for a range of IM7/8552 carbon-epoxy laminates with different lay-ups [1]. Delamination in these specimens from tests interrupted at various load levels prior to ultimate failure was detected through C-scans. In this work, a finite element modelling approach which explicitly models the splitting, delamination and fibre failure was used to simulate the sub-critical damage interaction and damage propagation in OCT tests. Cohesive interface elements with mixed mode failure criteria [2] are used to model splitting and delamination within and between plies and a Weibull statistical failure criterion is implemented within the ply solid elements to simulate the fibre failure. This approach is based on the following assumptions: