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Contraintes résiduelles induites par impact rapide. Application au choc-laser.

Abstract : Since 1970, developments in theoretical understanding of fatigue phenomena and their modeling (include the work of MM. Bang Van and Papadopoulos) led to the prediction of fatigue life of a structure subjected to cyclic loading any. Other work (theoretical or experimental) were undertaken in parallel in order to characterize the effect of surface treatment on a given material subjected to an unknown. It tends to give the engineer all theoretical tools allowing to size a mechanical part, the choice of material and processing to define the geometry. Moreover, the complexity of surface treatments designed to present detailed modeling requires them to achieve its optimization. This context led us to ask ourselves the problem of modeling a surface treatment récemmentapparu: shock-laser. This is a purely mechanical surface treatment performed using laser pulses of very high intensity. Indeed, irradiation of a target by such a laser pulse causes the application of a strong pressure for a very short time. The surface of the target. This phenomenon is quite similar to an impact. The laser impact will then induce compressive residual stresses on the surface of the target which will then be very favorable to the fatigue. It is understandable then that the analysis of shock-laser passes through the modeling and calculation of residual stresses induced by impact. This is the subject of part of this work. The results are applied to laser shock will then allow the calculation of residual stresses induced in the characteristics of the material constituting the target and adjusting the laser. Tl becomes very easy to optimize material and setting for a given application.
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https://pastel.archives-ouvertes.fr/pastel-00001897
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Submitted on : Friday, July 30, 2010 - 2:07:58 PM
Last modification on : Friday, July 31, 2020 - 9:22:02 AM
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  • HAL Id : pastel-00001897, version 1

Citation

Patrick Ballard. Contraintes résiduelles induites par impact rapide. Application au choc-laser.. Mécanique [physics.med-ph]. Ecole Polytechnique X, 1991. Français. ⟨pastel-00001897⟩

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