Design and Analysis of Naca0016 Wing Rib and Stringers by Using Al-7075 and Kevla

Abstract

Wing structure consists of skin, ribs and spar sections. The spar carries flight loads and  the weight of the wings while on the ground. Other structural and forming members such as ribs  are attached to the spars, with stressed skin. The wings are the most important lift- producing  part of the aircraft. The design of wings may vary according to the type of aircraft and its  purpose.  In this thesis, project detailed design of trainer aircraft wing structure made by using  PRO-ENGINEER WILDFIRE 5.0. Then stress analysis of the wing structure is carried out to  compute the stresses at wing structure. The stresses are estimated by using the finite element  approach with the help of ANSYS to find out the safety factor of the structure. In a structure like  airframe, a fatigue crack may appear at the location of high tensile stress. Life prediction requires  a model for fatigue damage accumulation, constant amplitude S-N (stress life) data for various  stress ratios and local stress history at the stress concentration. The response of the wing  structure will be evaluated.  In this thesis, the trainer aircraft wing structure with skin, spars and ribs is considered for  the detailed analysis. The wing structure consists of 15 ribs and two spars with skin. Front spar having “I” section and rear spar having “C‟ section. Stress and fatigue analysis of the whole  wing section is carried out to compute the stresses and life at spars and ribs due to the applied  pressure load.