Environmental Parameter Effects on the Fate of a Chemical Slick

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Near-field BLEVE overpressure effects: The shock start model

International audienceThis paper presents the results of a small scale experimental study of BLEVE overpressure effects. Testing consisted of a sealed aluminum tube (0.6 L) filled with either water or propane, being heated by a flame until the internal pressure led to catastrophic failure and explosion. Three parameters were controlled during the experiments: the failing pressure, the weakened length on the tube and the fill level. BLEVEs were obtained with tests involving water and propane. Blast gages and optical techniques were used to characterize the shock wave escaping from the failing tube. The results obtained suggest that the lead shock was primarily generated by the vapor space. Overpressure results obtained were compared with the predictions of existing models and found to be in reasonable agreement except for overpressures measured vertically above the cylinder where the overpressures were highest. A prediction model based on only vapor space characteristics was developed. Images show that the shock was fully formed at some distance away from the vessel opening and this was due to the non-ideal opening of the vessel. The model developed was based on the characteristics of the shock when fully formed away from the tube. These characteristics were defined using a combination of imaging, pressure measurements, and predictions from shock tube theory

Application de la granularite laser à la métrologie des microdéplacements

study and development of phase shifting speckle interferometer sensitive to out of plane and in plane deformation. Applications to mechanical testingEtude et developement d'un interferometre speckle a decalage de phase sensible hors plan et dans le plan. Validation sur cas mecanique

Contribution de l ’Optique Appliquée à la Mécanique et aux Sciences des Risques

Au gré de ce manuscrit, ces différentes techniques optiques - ESPI, SI, TVH, DHI, BOS, DIC,PIV, PLIF, PILS1 … - seront décrites avec leurs avantages et inconvénients, et en présentantdes applications dans différents domaines, de la mécanique du solide aux risques, en passantpar le collage et les interactions de projectiles hyper véloce.Cet ouvrage est structuré en techniques cohérentes et incohérentes, tout en précisantqu’actuellement elles sont toutes compatibles avec l’acquisition rapide d’images.Le projet de recherche concerne principalement la caractérisation des risques industriels etplus particulièrement les phénomènes accidentels rapides. Afin de mieux appréhender lesconséquences et la phénoménologie de ces événements, les perspectives de recherche y sontdécrites, notamment en visualisation rapide couplée à différents capteurs ainsi que lapossibilité de mettre en évidence certains phénomènes … invisibles sans transformationoptique adéquate

Elementary Speckle Interferometry

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Éléments d’interférométrie speckle

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Applications of self-processing polymer materials: double step image holography

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Elementary Speckle Interferometry

International audienc

Applications of self-processing polymer materials: Double step image holography

peer reviewedPhotosensitive material for holographic recordin