Search results for: Michele Meo

Items from 1 to 16 out of 16 results

article

An Experimental Assessment on the Influence of Carbon Nanotubes Matrix Charging on the Fatigue Behavior of Composite Laminates

Angela Russo, Michele Meo, Mauro Zarrelli, Francesco Flora, more

Macromolecular Symposia > 404 > 1 > n/a - n/a

In this work, an experimental preliminary assessment on the fatigue behavior of nanomodified composite coupons has been attempted. Comparisons between the fatigue life of epoxy resin/carbon fiber neat coupons and epoxy resin/carbon fiber specimens reinforced with nanoparticles have been carried out. Tensile, compressive, and in‐plane shear samples have been manufactured according to ASTM D3039, ASTM...

article

Phase symmetry analysis for nonlinear ultrasonic modulated signals

Gian Piero Malfense Fierro, Francesco Ciampa, Michele Meo

Structural Control and Health Monitoring > 27 > 5 > n/a - n/a

Nonlinear ultrasonic experiments typically require digital pass‐band filters and advanced signal processing tools to highlight low‐amplitude nonlinear elastic effects such as harmonics, subharmonics, and sidebands, which are used as signatures for the presence of damage. However, current signal processing techniques cannot be used with dual periodic excitation without reducing signal frequency resolution...

article

Nonlinear elastic imaging of barely visible impact damage in composite structures using a constructive nonlinear array sweep technique

Gian Piero Malfense Fierro, Michele Meo

Ultrasonics > 2018 > 90 > C > 125-143

Linear and nonlinear ultrasound imaging methods highlight different damage features: the linear method detects large stiffness changes, while the nonlinear technique identifies small impedance mismatches, such as microcracks or closed delaminations. Typically, nonlinear ultrasound techniques detect damage/defects in materials by measuring higher order harmonics. These harmonics can be difficult to...

article

Image processing based quantitative damage evaluation in composites with long pulse thermography

Zijun Wang, GuiYun Tian, Michele Meo, Francesco Ciampa

NDT & E International > 2018 > 99 > C > 93-104

Pulsed thermography is a contactless and rapid non-destructive evaluation (NDE) technique that is widely used for the inspection of fibre reinforced plastic composites. However, pulsed thermography uses expensive and specialist equipment such high-energy flash lamps to generate heat into the sample, so that alternative thermal stimulation sources are needed. Long pulse thermography was recently developed...

article

Imaging of Barely Visible Impact Damage on a Complex Composite Stiffened Panel Using a Nonlinear Ultrasound Stimulated Thermography Approach

Gian Piero Malfense Fierro, Dmitri Ginzburg, Francesco Ciampa, Michele Meo

Journal of Nondestructive Evaluation > 2017 > 36 > 4 > 1-21

Thermosonics, also known as ultrasonic stimulated thermography, is a rapid non-destructive evaluation technique that uses an infrared camera to visualise material defects by detecting the frictional heating at crack surfaces when a part under inspection is vibrated. These vibrations are usually produced by an ultrasonic horn being pressed against the surface of the test sample, which result in uncontrolled...

article

Nonlinear ultrasonic stimulated thermography for damage assessment in isotropic fatigued structures

Gian Piero Malfense Fierro, Danielle Calla', Dmitri Ginzburg, Francesco Ciampa, more

Journal of Sound and Vibration > 2017 > 404 > C > 102-115

Traditional non-destructive evaluation (NDE) and structural health monitoring (SHM) systems are used to analyse that a structure is free of any harmful damage. However, these techniques still lack sensitivity to detect the presence of material micro-flaws in the form of fatigue damage and often require time-consuming procedures and expensive equipment. This research work presents a novel "nonlinear...

article

Nonlinear imaging (NIM) of flaws in a complex composite stiffened panel using a constructive nonlinear array (CNA) technique

Gian Piero Malfense Fierro, Michele Meo

Ultrasonics > 2017 > 74 > C > 30-47

Recently, there has been high interest in the capabilities of nonlinear ultrasound techniques for damage/defect detection as these techniques have been shown to be quite accurate in imaging some particular type of damage. This paper presents a Constructive Nonlinear Array (CNA) method, for the detection and imaging of material defects/damage in a complex composite stiffened panel. CNA requires the...

book

Composite Materials

Luigi Nicolais, Michele Meo, Eva Milella, Springer London

Composite Materials presents recent developments and state-of-the-art achievements in the science and technology of composites. It identifies and discusses key and emerging issues for future progress in the multidisciplinary field of composites. By bringing together leading experts and promising innovators from research institutions and academia, Composite Materials highlights unresolved issues and...

article

Nonlinear Imaging Method Using Second Order Phase Symmetry Analysis and Inverse Filtering

Francesco Ciampa, Gennaro Scarselli, Michele Meo

Journal of Nondestructive Evaluation > 2015 > 34 > 2 > 1-6

This paper presents a nonlinear imaging method based on nonlinear elastic guided waves, for the damage detection and localisation in a composite laminate. The proposed technique relies on the study of the structural nonlinear responses by means of a combination of second order phase symmetry analysis (PSA) with chirp excitation and inverse filtering (IF) method. PSA was used to exploit the invariant...

article

Hybrid S2/Carbon Epoxy Composite Armours Under Blast Loads

F. Dolce, Michele Meo, A. Wright, M. French, more

Applied Composite Materials > 2012 > 19 > 3-4 > 349-362

Civil and military structures, such as helicopters, aircrafts, naval ships, tanks or buildings are susceptible to blast loads as terroristic attacks increases, therefore there is the need to design blast resistant structures. During an explosion the peak pressure produced by shock wave is much greater than the static collapse pressure. Metallic structures usually undergo large plastic deformations...

article

A fast object-oriented Matlab implementation of the Reproducing Kernel Particle Method

Ettore Barbieri, Michele Meo

Computational Mechanics > 2012 > 49 > 5 > 581-602

Novel numerical methods, known as Meshless Methods or Meshfree Methods and, in a wider perspective, Partition of Unity Methods, promise to overcome most of disadvantages of the traditional finite element techniques. The absence of a mesh makes meshfree methods very attractive for those problems involving large deformations, moving boundaries and crack propagation. However, meshfree methods still have...

article

A Meshless Cohesive Segments Method for Crack Initiation and Propagation in Composites

Ettore Barbieri, Michele Meo

Applied Composite Materials > 2011 > 18 > 1 > 45-63

A modeling method aimed at eliminating the need of explicit crack representation in bi-dimensional structures is presented for the simulation of the initiation and subsequent propagation within composite materials. This is achieved by combining a meshless method with a physical stress–displacement based criterion known as Cohesive Model. This model consents to apply a penalty-based approach to delamination...

article

On the estimation of mechanical properties of single-walled carbon nanotubes by using a molecular-mechanics based FE approach

Marco Rossi, Michele Meo

Composites Science and Technology > 2009 > 69 > 9 > 1394-1398

Carbon nanotubes (CNTs) have attracted considerable attention in scientific communities due to their remarkable mechanical, thermal and electrical properties (high stiffness, high strength, resilience, etc.). In particular, mechanical properties of single wall nanotubes (SWNTs) have a Young’s modulus of about 1TPa if normalized to their diameter showing why they are widely considered as reinforcing...

article

Detecting Damage in Composite Material Using Nonlinear Elastic Wave Spectroscopy Methods

Michele Meo, Umberto Polimeno, Giuseppe Zumpano

Applied Composite Materials > 2008 > 15 > 3 > 115-126

Modern aerospace structures make increasing use of fibre reinforced plastic composites, due to their high specific mechanical properties. However, due to their brittleness, low velocity impact can cause delaminations beneath the surface, while the surface may appear to be undamaged upon visual inspection. Such damage is called barely visible impact damage (BVID). Such internal damages lead to significant...

article

Damage assessment on plate-like structures using a global-local optimization approach

Michele Meo, G. Zumpano

Optimization and Engineering > 2008 > 9 > 2 > 161-177

A new method for finite element model updating using simulated data is presented. A global-local optimization (GLO) approach was adopted to adjust the uncertain properties of the FE model by minimizing iteratively the differences between the measured dynamic modal parameters and the corresponding analytical predictions. In contrast with most of the existing updating techniques, which minimize modal...

article

Prediction of Young’s modulus of single wall carbon nanotubes by molecular-mechanics based finite element modelling

Michele Meo, Marco Rossi

Composites Science and Technology > 2006 > 66 > 11-12 > 1597-1605

The aim of this paper is to propose a Single Walled Carbon Nanotube (SWCNT) finite element (FE) model, based on the use of non-linear and torsional spring elements, to evaluate its mechanical properties. The choice of the spring elements to build the FE model, was based on the observation that other elements as beam, truss or shell are not very applicable because of the complex interaction of many...

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