H<inf>∞</inf> observer design for uncertain nonlinear discrete-time systems with time-delay: LMI optimization approach (2014)
Journal Article

Copyright © 2014 John Wiley & Sons, Ltd. We present a robust H∞ observer for a class of nonlinear discrete-time systems. The class under study includes an unknown time-varying delay limited by upper and lower bounds, as well as time-varying paramet... Read More about H<inf>∞</inf> observer design for uncertain nonlinear discrete-time systems with time-delay: LMI optimization approach.

Acoustic emission-based study to characterize the initiation of delamination in composite materials (2014)
Journal Article

© The Author(s) 2014. Among the failure modes of composite materials, delamination is the most striking one. It may result in the reduction of stiffness and long-term performance of composite materials. The initiation stage is very crucial in delamin... Read More about Acoustic emission-based study to characterize the initiation of delamination in composite materials.

Efficient solution of the fuzzy eigenvalue problem in structural dynamics (2014)
Journal Article

© Emerald Group Publishing Limited. Purpose - Many analysis and design problems in engineering and science involve uncertainty to varying degrees. This paper is concerned with the structural vibration problem involving uncertain material or geometric... Read More about Efficient solution of the fuzzy eigenvalue problem in structural dynamics.

The effect of corrugated skins on aerodynamic performance (2014)
Journal Article

Corrugated skins provide a good solution to morphing wings due to their highly anisotropic behavior. If the low stiffness corrugation plane is aligned in the chordwise direction, the airfoil shape change is possible. In contrast to the traditional sm... Read More about The effect of corrugated skins on aerodynamic performance.

Damage Classification of Sandwich Composites Using Acoustic Emission Technique and k-means Genetic Algorithm (2014)
Journal Article

© 2014, Springer Science+Business Media New York. In this study acoustic emission (AE) technique was used for monitoring mode I delamination test of sandwich composites. Since, during mode I delamination test various damage mechanisms appear, their c... Read More about Damage Classification of Sandwich Composites Using Acoustic Emission Technique and k-means Genetic Algorithm.

Investigation of the mixed-mode delamination in polymer-matrix composites using acoustic emission technique (2014)
Journal Article

© The Author(s) 2014 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav. This paper is a novel application of acoustic emission (AE) technique to investigate the actual occurring modes of delamination damage (i.e. mode I, mode II and the... Read More about Investigation of the mixed-mode delamination in polymer-matrix composites using acoustic emission technique.

Modelling manufacturing deformations in corner sections made of composite materials (2013)
Journal Article

A three-step finite element model has been implemented to predict the spring-in of L-shaped parts. The material property development during the cure has been modelled as step changes during transitions between viscous, rubbery and glassy states of th... Read More about Modelling manufacturing deformations in corner sections made of composite materials.

Variable stiffness biological and bio-inspired materials (2013)
Journal Article

This article reviews the main mechanisms of stiffness variation typically found in nature. The temporal changes in stiffness may be fully or partially reversible, or completely irreversible, and can be very slow or fast in time depending on the strat... Read More about Variable stiffness biological and bio-inspired materials.

Bearing failure of pseudo-ductile thin ply angle-ply laminates
Presentation / Conference Contribution

The aim of this work is to investigate the bearing failure of mechanically fastened joints between thin-ply angle-ply laminates with central 0° plies. To achieve this, pseudo-ductile laminates with two different layups [±6/0]s2 and [±2/0]s4 were... Read More about Bearing failure of pseudo-ductile thin ply angle-ply laminates.

Reduced tensile notch-sensitivity in pseudo-ductile thin ply composites
Presentation / Conference Contribution

Pseudo-ductile thin-ply composites loaded in tension exhibit a non-linear stress-strain response with a plateau, analogous to yielding in a metal. This provides an alternative means for load redistribution at stress concentrations, giving reduced not... Read More about Reduced tensile notch-sensitivity in pseudo-ductile thin ply composites.

Thin ply carbon/glass hybrid laminates to activate new damage mechanisms under indentation
Presentation / Conference Contribution

Low velocity impacts on composite laminates can cause a significant amount of delamination that is often referred to as barely visible impact damage (BVID). This damage can cause significant degradation of structural properties, especially the compre... Read More about Thin ply carbon/glass hybrid laminates to activate new damage mechanisms under indentation.

Self-warning hybrid composite patches for repairing cracked aluminium panels
Presentation / Conference Contribution

In this paper, a new concept for health-moninoring of bonded patch repairs is presented. Aerospace structures using aluminium panels occasionally crack and bonded composite patches are one of the repair methods available to maintain the integrity of... Read More about Self-warning hybrid composite patches for repairing cracked aluminium panels.

Development and evaluation of a novel piezoelectric PVDF sensor as a load spectrum counter
Presentation / Conference Contribution

Engineering structures, such as aircraft, marine vessels, buildings and offshore platforms, are subjected to a range of uncertain dynamic loadings, due to changes in operational and environmental conditions, etc. Unfortunately, the load spectrum of t... Read More about Development and evaluation of a novel piezoelectric PVDF sensor as a load spectrum counter.