Critical overview of modified hydraulic bulging in determination of flaw stress curve

Math, Miljenko and Keran, Zdenka and Piljek, Petar (2011) Critical overview of modified hydraulic bulging in determination of flaw stress curve. = Critical overview of modified hydraulic bulging in determination of flaw stress curve. In: International Conference on Innovative Technologies, 01-03. 09. 2011., Bratislava, Slovačka.

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Abstract

. In this study novel method of recording the true stress – strain curves, originally derived from well known hydraulic bulging test has been critically reconsidered. New method allows more accurate determination of membrane stress in the deforming material. Assumption on the bulk geometry is no longer needed since modification, using sphere as an obstacle, determines the radius of curvature needed in acquisition of membrane stress. Use of the small transducer integrated in tooling, enables acquisition of force and thus reliable stress acquisition upon the known (spherical) geometry. Performing modified hydraulic bulging upon just one test specimen yields three points of stress-strain curve. Two different sheet thicknesses and two different sphere diameters have been researched in attempt to establish whether the assumption of membrane stress can be somewhat neglected or disregarded. The modified method has proved to be adequate for checking the numerical model, because it enables direct experimental measurement of the true stresses in the material, which cannot be obtained when classical hydraulic bulging test is performed.

Item Type: Conference or Workshop Item (Other)
Keywords (Croatian): Modified hydraulic bulging, flow stress–strain curve, hydroforming, FE simulation
Subjects: TECHNICAL SCIENCE > Mechanical Engineering
Divisions: 1200 Department of Technology > 1220 Chair of Metal Forming
Date Deposited: 22 Sep 2016 11:04
Last Modified: 22 Sep 2016 11:04
URI: http://repozitorij.fsb.hr/id/eprint/6899

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