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Abstract
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| Laser shock forming is a non-thermal laser forming method by using the shock wave induced by laser irradiation to modify the curvature of the target. It has the advantages of laser thermal forming (non-contact, tool-free and high efficiency and precision). But its non-thermal process makes it possible to maintain material properties or even improve them by inducing compressive stress over the target surface, which is desirable since it is important for shaped metal parts to resist cracks from corrosion and fatigue. In this paper, laser shock microforming is studied using both numerical and experimental methods for a thin metallic film. The numerical model is integrated by two principal modules, a 1-D radiation-hydrodynamics code that is used to simulate the dynamic evolution of laser created plasmas and a finite element code to study shock evolution and target deformation. The microforming experiments reported in this paper were performed on AISI 304 alloy using a Q switched Nd:YAG laser at 1064 nm wavelength with 9.4 ns FWHM and 54 mJ per pulse and 150 microns of spot radius. The sample curvatures were measured using confocal microscopy to find the bending angle. Analysis of the influence of laser spot position, number of pulses and thin sheet clamping is presented. The observed experimental profiles are in good agreement with the numerical model predictions. The suitability of laser shock microforming of thin metal sheets using ns pulsed lasers is demostrated. | |
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International
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Si |
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Congress
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E-MRS SPRING MEETING 2008. SYMPOSIUM B |
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960 |
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Place
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ESTRASBURGO (FRANCIA) |
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Reviewers
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Si |
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ISBN/ISSN
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0000000000 |
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Start Date
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26/05/2008 |
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End Date
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30/05/2008 |
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From page
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1 |
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To page
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1 |
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ABSTRACTS WEB EMRS |