Concept

Choc mécanique

Publications associées (35)

A shock front at the radio relic of Abell 2744

Jean-Paul Richard Kneib, Mathilde Jauzac, Céline Tchernin

Radio relics are Mpc-scale diffuse radio sources at the peripheries of galaxy clusters which are thought to trace outgoing merger shocks. We present XMM-Newton and Suzaku observations of the galaxy cluster Abell 2744 (z = 0.306), which reveal the presence ...

Oxford Univ Press2016

Design and characterization of a soft magneto-rheological miniature shock absorber for a controllable variable stiffness sole

Yves Perriard, Yoan René Cyrille Civet, Daniel Grivon

The proposed paper discusses the design and characterization of a soft miniature Magneto-Rheological (MR) shock absorber. In particular, the final application considered for the insertion of the designed devices is a controllable variable stiffness sole fo ...

2015

Impact properties of shear thickening fluid impregnated foams

Véronique Michaud, Mathieu Soutrenon

Concentrated colloidal suspensions of silica particles in polyethylene glycol exhibit a shear thickening behavior: above a critical shear rate in a confined environment, they show a steep increase of viscosity. This reversible transition from a low to a hi ...

Institute of Physics2014

Advanced sol-gel processing of PZT thin films for piezoelectric MEMS structures

Nachiappan Chidambaram

Micro-electro-mechanical systems (MEMS) technology is revolutionizing industrial and consumer products by replacing bulky devices by miniaturized versions that are suitable for portable applications as for instance in mobile phones. Besides small size, the ...

EPFL2014

Shear Thickening Fluid Impregnated Foam Composites for Vibration Control and Impact Protection

Mathieu Soutrenon

Highly concentrated suspensions of silica particles present shear thickening properties, shifting from a low to a high viscosity state, instantly and reversibly at a critical shear rate. Their viscosity increases by up to 3 orders of magnitude, changing fr ...

EPFL2013

The simultaneous low state spectral energy distribution of 1ES 2344+514 from radio to very high energies

Thomas Günther Bretz

Context. BL Lacertae objects are variable at all energy bands on time scales down to minutes. To construct and interpret their spectral energy distribution (SED), simultaneous broad-band observations are mandatory. Up to now, the number of objects studied ...

Edp Sciences S A2013

Structural monitoring: identification and location of an impact on a structurally dissipating rock-shed structure using the inverse method

Fabrice Dupray

In this study we developed an experimental method to identify the impact force on a reinforced concrete slab. A transfer function obtained experimentally between the acceleration response and the force history applied to a point of the structure was used. ...

2012

Cavitation in impacted drops and jets and the effect on erosion damage thresholds

Mohamed Farhat, Danail Obreschkow, Marc Tinguely

It is well known that metals and alloys erode at lower impact threshold velocities than expected. This was studied by Thomas and Brunton (1970) who reported “discrepancy factors” in the range 4–10. These authors suggested that liquid impact was a more sear ...

Elsevier Science Sa2012

Vibration and shock reliability of MEMS: modeling and experimental validation

Herbert Shea, Robert Andrew Lockhart, Subramanian Sundaram, Maurizio Tormen

A methodology to predict shock and vibration levels that could lead to the failure of MEMS devices is reported as a function of vibration frequency and shock pulse duration. A combined experimental–analytical approach is developed, maintaining the simplici ...

Institute of Physics2011

ESD testing and combdrive snap-in in a MEMS tunable grating under shock and vibration

Herbert Shea, Robert Andrew Lockhart, Subramanian Sundaram, Maurizio Tormen

This work describes a method for tracking the dynamics of electrostatic discharge (ESD) sensitive MEMS structures during ESD events, as well as a model for determining the reduced combdrive snap-in voltage under vibration and shock. We describe our ESD tes ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa2011

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