FATIGUE LIFE ANALYSIS OF THE INTEGRAL SKIN-STRINGER PANEL USING XFEM
Abulgasem Sghayer1, Aleksandar Grbović1, Aleksandar Sedmak1, Mirko Dinulović1, Elisaveta Doncheva2, Blagoj Petrovski3
1)University of Belgrade, Faculty of Mechanical Engineering, Belgrade, Serbia
2)University in Skopje Ss. Cyril and Methodius, Faculty of Mechanical Engineering, Skopje, Macedonia (FYROM)
3)University of Belgrade, Innovation Centre of the Faculty of Mech. Engng., Belgrade, Serbia
Fatigue life of integral skin-stringer panels produced by laser beam welding (LBW) is analysed. This type of panel is used in airframe construction where fatigue and damage tolerance are of paramount importance, since aircrafts must be designed to tolerate relatively large fatigue cracks. The analysed integral skin-stringer panel is made of AL-AA 6156T6/2.8 mm, where stringers are laser beam welded to the airframe skin. By using the extended finite element method (XFEM), fatigue life of simple flat plate, as well of the skin-stringer panel, are numerically simulated in order to investigate the effect of stringers.
Keywords: integral skin-stringer structures, XFEM, stress intensity factor (SIF), crack propagation modelling