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Institute "Kemal Kapetanović" Zenica, University of Zenica , Zenica , Bosnia and Herzegovina
Faculty of Engineering and Natural Sciences, University of Zenica , Zenica , Bosnia and Herzegovina
Metacomm , Jajce , Bosnia and Herzegovina
The paper describes the determination of the mechanical properties of the spherical floors of
pressure vessels, obtained by the welding process and shaped by the process of gradual local
deformation in the cold state, i.e. by the process of Incremental sheet forming (ISF). Spherical
cylindrical bottoms are an integral part of most closed-pressure vessels. Cylindrical pressure vessel
floors are made from one part, but the standards also allow for welded construction when the
dimensions of the floors are larger than the standard dimensions of the sheet metal for production.
Pressure vessel floors obtained by the welding process and shaped by the process of gradual local
deformation in the cold state, i.e. by the process of incremental deformation, have a multiaxial
initial stress state, which differs significantly from the initial stress state of the cylindrical part of
the vessel.
Checking the behavior of such floors before completing the vessel itself, i.e. before putting it into
operation, is necessary, on the one hand, due to a large number of influencing factors, and on the
other hand, due to the high cost of testing the real construction itself.
The aim of the test is to determine the influence of the parameter: type of material, thickness, and
diameter on the following quantities: mechanical properties, ReH, Rm, A5, and total energy used for
impact, KV.
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