Browsing by Author "Tourneix, M."

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    Analysis of plastic strain localization by a combination of the speckle interferometry with the bulge test
    (ELSEVIER SCI LTD, 2007) Montay, G.; Francois, M.; Tourneix, M.; Guelorget, B.; Vial Edwards, C.; Lira, I.
    The process of localization of strains, diffuse and localized necking, up to fracture in equi-biaxial loading was analyzed through the images obtained by electronic speckle pattern interferometry (ESPI). The problem of localization is important in the sheet metal forming processes. The ESPI technique is used to have a better resolution on the measured strains (10(-5)) than other technique such as the image correlation (10(-2), 10(-3)). The bulge test is currently used to determine the mechanical properties of materials by measuring the deformation that occurs in response to the application of a controlled pressure. This test is used to determine the mechanical properties of sheet metals submitted to an equi-biaxial loading path, the strains at failure are used as data to determine forming limit diagrams (FLDs).
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    Strain and strain rate measurement during the bulge test by electronic speckle pattern interferometry
    (ELSEVIER SCIENCE SA, 2007) Montay, G.; Francois, M.; Tourneix, M.; Guelorget, B.; Vial Edwards, C.; Lira, I.
    This paper presents a new experimental method to measure the strain increment and the strain rate during the bulge of a copper sheet. The electronic speckle pattern interferometry (ESPI) is combined with the bulge test to measure the field of strain increment. The strain rate is used to detect heterogeneity in the strain distribution.