Stefania Lo Feudo

ISAE Supméca - Institut supérieur de mécanique de Paris

The onset and propagation of edge debonding in beams strengthened with externally bonded fiber-reinforced composite plates, is here examined using an innovative multi-layer formulation. A novel mixed mode coupled criterion is adopted to predict debonding initiation accounting for both fracture energies and interfacial stresses and considering diffe...

A Tuned Mass Damper (TMD) is a structural passive control device fixed on a structure and composed of a linear oscillator which natural frequency is tuned to that of the structure, or to the dominant resonance frequency. In this paper, an experimental TMD with adjustable stiffness and eddy current damping is proposed. The first step is to check if...

Cette étude porte sur la caractérisation expérimentale et numérique d’un amortisseur de vibrations non linéaire magnétique avec raideurs linéaires et non linéaires ajustables. Le système primaire dont on souhaite réduire les oscillations est une plaque mince vibrant en grande amplitude. Le réglage des caractéristiques de l’amortisseur magnétique so...

We propose a method to measure the vibrations amplitude of normal modes of a 3D mechanical structure with only one camera. Our method requires only a video sequence taken by a single camera and a collection of admissible 3D deflection shapes. The deflection shapes are projected in the image frame of the camera. This is done thanks to a linearizatio...

This study proposes to carry out the experimental modal analysis of nonlinear systems under the assumption of almost invariant modal shapes by coupling video analysis from a high speed/resolution camera and extended Kalman filtering. A clamped-clamped beam with a local nonlinearity is considered, and its vibrations are measured by detecting and tra...

Seminar on Linear and Nonlinear Devices for Passive Vibration Control

This paper reassesses carefully the effects and consequences of instantaneous contact mechanics versus finite contact duration modeling of Vibro-Impact Nonlinear Energy Sinks (VI NES). The device is composed of a container enclosing an inelastic sphere, interacting via a nonlinear viscoelastic dissipative force with the inner walls of the container...

This paper investigates the rocking behavior of rigid bodies seismically protected by means of lead rubber bearings and high damping rubber bearings, which are the most popular kinds of elastomeric isolators in the market. The complex nonlinear force–displacement relationship displayed by such devices is predicted by a phenomenological model based...

In this paper, we propose a new method to measure the vibrations of a 3D mechanical structure. It requires only a video sequence taken by a single camera and a Finite Element model of the structure. First, the intrinsic and extrinsic parameters of the camera are identified. Then, a collection of numerical deflection shapes and normal modes are proj...

A nonlinear magnetic vibration absorber is presented and used to control vibration of a three–storey structure. A distinctive feature of the absorber concerns its versatility for tuning the linear and nonlinear stiffness coefficients, depending on simple geometric design parameters such as the distance between fixed magnets and the moving one. In p...

Edge debonding initiation and propagation in beams strengthened with fiber-reinforced composite plates is here studied. The structural system is composed by three physical components, namely the beam, the adhesive layer and the bonded plate, which are modeled by one or several first-order shear deformable layers according to a multi-layer formulati...

The main purpose of this study is the analysis of edge debonding in beams strengthened with externally bonded fiber--reinforced polymers (FRP) composite plates. At first, the topic is introduced in general terms by a literature review focused on composite materials main properties and modeling approaches. Then, an innovative multi--layer formulatio...