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REPUBLIC OF SERBIA MINISTRY OF DEFENCE
MINISTRY OF DEFENCE Material Resources Sector Defensive Technologies Department
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RESIDUAL LIFE ESTIMATION OF AIRCRAFT STRUCTURAL COMPONENTS UNDER LOAD SPECTRUM
Military Technical Institute, Belgrade, s.maksimovic@mts..rs KATARINA MAKSIMOVIĆ City of Belgrade – City Government, Secretariat for Communal and Housing Affairs Office of Water Management, Belgrade, Serbia, kmaksimovic@mts.rs IVANA VASOVIĆ Lola Institute, Kneza Višeslava 70a, Belgrade, Serbia, ivanavvasovic@gmail.com MIRJANA ĐURIĆ Military Technical Institute, Belgrade, minadjuric12@gmail.com MIRKO MAKSIMOVIĆ Belgrade Waterworks and Sewerage, Kneza Miloša 27, Belgrade, Serbia, maksimovic.mirko@gmail.com
Abstract: This work is focused on developing computation procedure for strength analysis of aircraft structures with respect to fracture mechanics and residual life. For that purpose here will be defined computation procedures for life estimation of constructions under cyclic loads of constant amplitude and load spectrum. The finite element method (FEM) allowed the prediction of the point of crack initiation and the crack propagation using the orientations of the maximum principal stresses. Stress intensity factor (SIF) is the base parameter in strength analysis regarding fracture mechanics. For correct determination SIF in this work special singular finite elements will be used. A special aspect of this investigation is based on application of Strain Energy Density (SED) method in residual life estimation of structural components with initial cracks. Verification of computation procedures for life estimations will be supported with corresponding experimental tests for determination low cyclic fatigue properties of materials and corresponding parameters of fracture mechanics including fatigue tests of representative aircraft structural components. Keywords: aircraft, fracture mechanics, fatigue, residual life estimation, strain energy density, FEM |
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