REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

ANALYSIS OF AIRCRAFT STRUCTURES CROSS SECTION

Bogdan S. Bogdanović

UTVA AI, Pančevo, bogdanovic00@gmail.com

Dario A. Sinobad

UTVA AI, Pančevo, 318dsinobad@gmail.com

Tonko A. Mihovilović

UTVA AI, Pančevo, tonkojetonko@gmail.com

Abstract: Definition of normal and shear stresses produced by bending and twist in closed semi – monocoque structures, as structures mostly used in aircraft structures is considered in this paper. Calculation is realized using well known theoretical background such as fundamental beam theory, shear flow definition in statically indeterminate structure (single redundancy). Buckling behavior of thin sheet is also taken into account. As results effective cross section is defined and normal stresses in longitudinal parts, stringers, and shear stresses in skin, thin sheets, between stringers, are obtained. Complete procedure for the whole calculation is formed, and some results are shown.

Keywords: effective width, normal stresses, shear stresses, shear center.