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Vol 14, Issue 1, 2023
Pages: 149 - 157
Research article
Metallic materials
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Published: 01.05.2023. Research article Metallic materials

CONTRIBUTION TO MECHANICAL PROPERTIES ASSESSMENT OF SPHERICAL CYLINDRICAL HEAD SHELLS MADE BY THE INCREMENTAL SHEET FORMING

By
Mustafa Hadžalić ,
Mustafa Hadžalić
Contact Mustafa Hadžalić

Institute "Kemal Kapetanović" Zenica, University of Zenica , Zenica , Bosnia and Herzegovina

Raza Sunulahpašić ,
Raza Sunulahpašić

Faculty of Engineering and Natural Sciences, University of Zenica , Zenica , Bosnia and Herzegovina

Zlatan Ištvanić
Zlatan Ištvanić

Metacomm , Jajce , Bosnia and Herzegovina

Abstract

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. 

References

1.
Pressure Equipment Directive. 1997;
2.
Zlatan Ištvanić: Prilog utvrđivanju integriteta cilindričnih danaca izrađenih postupkom inkrementalne deformacije, doktorska disertacija. 2022;
3.
Michael B. Prime: Residual stress measurement by successive extension of a slot: The crack compliance method. Applied Mechanics Reviews. 1999;52(2):75-96,.
4.
BAS EN ISO 6892-1:2017 B: Metallic materials — Tensile testing — Part 1: Method of test at room temperature.
5.
ISO 148-1:2017: Metallic materials — Charpy pendulum impact test — Part 1: Test method.
6.
BAS EN ISO 9016:2012: Destructive tests on welds in metallic materials — Impact tests — Test specimen location, notch orientation and examination.

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