Author(s):
1. Stevan Maksimović, Vojnotehnički Institut Beograd, Serbia
2. Mirjana Đurić, Military Tehnical Institute Belegrad, Serbia
3. Mirko Maksimović, Waterworks and Sewerage, Serbia
4. Ivana Vasović, Institut Goša, Milana Rakića 35, Beograd, Serbia

Abstract:
Subject of this work is focused to developing computation procedure for residual fatigue life estimation of cracked structural components under load spectrum. Finite element method is used for determination of the stress intensity factors (SIF`s) of structural element with surface cracks. These discrete values of the stress intensity factors of cracked structural components are used for derivation of analytic function for SIF that is necessary in crack growth analyses. To demonstrate efficient computation procedure in residual fatigue life estimation of damaged structural elements here numerical examples are included. For residual life estimation of cracked structural elements here Strain Energy Density (SED) method is used. In this approach a low cyclic fatigue material properties are used. Computation procedure to strength analyze with respects to fracture mechanic and residual life estimations is applied to aircraft structural elements with surface cracks under load spectrum. Computation results are compared with correspond analytic experimental results.

Key words:
Fatigue, stress intensity factors, surface cracks, singular finite elements, fatigue life prediction

Thematic field:
Mechanics and Design

Date of abstract submission:
02.03.2015.

Conference:
12th International conference on accomplishments in Electrical and Mechanical Engineering and Information Technology (DEMI 2015)

Final paper