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

Autori
Math, Miljenko ; Keran, Zdenka ; Piljek, Petar

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), ostalo

Izvornik
Proceedings of International Conference on Innovative Technologies IN-TECH / Jan, Kudlaček ; Zlatan, Car ; Tomaž, Pepelnjak ; Michal, Pakosta - Bratislava : Tisk AS, 2011, 368-370

ISBN
978-80-904502-6-4

Skup
International Conference on Innovative Technologies

Mjesto i datum
Bratislava, Slovačka, 01.09.2011. - 03.09.2011

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Modified hydraulic bulging; flow stress–strain curve; hydroforming; FE simulation

Sažetak
. 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.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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