INFLUENCE OF COMBAT DAMAGES ON THE TECHNICAL CONDITION OF AVIATION STRUCTURES (AIRCRAFT) OF THE AIRFORCE OF UKRAINE
DOI:
https://doi.org/10.54858/dndia.2021-17-20Keywords:
computer simulation, technical condition, aircraft main element, helicopter blade, combat defeat, damage, resourceAbstract
The article solves the problem of determining the influence of combat damage on the deterioration of the bearing capacity of aircraft structures. The solutions were based on numerical-physical modeling of stress states of complex mechanical objects.
Gliders of the Su-25 planes and the propeller blades of the Mi-8 and Mi-24 helicopters were selected as objects of research. To research their technical condition, computer simulation of the stress state of the corresponding structural elements was performed.
The model of a part of the main element of the objects of research was built using the design documentation of the developer by its fragmentation by finite elements and further analysis of their distribution in places of stress concentration.
This approach allowed to solve the problems of solid mechanics and fracture mechanics in elastic and resiliently plastic settings under different operating conditions of the load. At the same time, the elements of the wing of the Su-25 aircraft and the blades of the propeller of the Mi-8 helicopter were considered separately, both in the basic version and with combat defeats. During the simulation, typical machine gun and shrapnel damage were reproduced in the model in the form of additional through holes.
The results of modeling the technical condition of the main elements of aircraft and helicopters without and with combat losses are presented.
Particularly dangerous zones of power elements of the structure have been identified, where the limit of endurance of the alloy is exceeded.
Considered possibilities of repair to construction defect-free condition due to repair decisions.
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