FATIGUE AND VIBRATION ANALYSIS OF DIFFERENT WING SPARS

Abstract

In a fixed-wing aircraft, the spar is the chief structural element of the wing, running span wise at right angles to the fuselage. The spar carries flight loads and the weight of the wings while on the ground. Other structural and forming members such as ribs may be attached to the spar or spars, with stressed skin construction also sharing the loads where it is used. Spars are also used in other aircraft airfoil surfaces such as the tail plane and fin and serve a similar function, although the loads transmitted may be different from those of a wing spar. This paper focuses on fatigue & Vibrational analysis of aircraft wing Spar. Three different types of spars (IC-L) sections are considered. Lift load on wing spar is calculated using analytical method. CAD model of an aircraft wing spars are modeled in CATIA software. Using ANSYS 14.5 workbench software fatigue life and safety factor is calculated in static structural analysis. Number of cycles to failure results were compared and found that I-Section spar has more life cycles and safety factor. Vibrational analysis is carried out by using I-Section spar.