12

Aircraft Structures

12.1 INTRODUCTION

The analysis of stresses in aircraft components is based on different assumptions than the analysis of stresses in beams or columns made of rolled sections. In aircraft construction, thin sheet of an aluminium alloy is riveted to stringers or flanges, and these thin sheet panels or webs are ineffective in sharing the bending loads. These thin webs are supposed to take only shearing stresses. Basically, the shear flow in the thin webs is analysed for a box beam section or an open box beam section. Under design requirements, cutouts are provided in wing structure and fuselage (body) structure. Shear flow in thin open box section redistributes the shear flow in the adjoining closed box section. Majority ...

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