Abstract
The subject of study in this article is the repair method of the aircraft (A/C) components made of polymer composite materials (PCM) with operational damage. This article improves the repair method of the A/C PCM components with cracks and holes. Objectives: to improve the repair method of operational damage of the A/C PCM components by layer-by-layer removal of the defective area using a milling tool; propose dependencies to determine the serviceability period of the damaged area, considering the safety factor and geometric parameters of the defect. The following methods are used: analysis of existing and common repair methods of the A/C PCM components, mathematical approaches for their evaluation based on solving systems of equations. According to the analysis, the shortcomings of existing and common repair methods of the A/C PCM components with cracks and holes are identified. A proposal is made to improve the adhesive repair method of the A/C PCM components by using a milling tool with a curved cutting edge with a radius of curvature from 3 mm to 5 mm. The main stages of such repair are updated by filling the repair area with isotropic polymer paste. The dependencies of the geometrical parameters of layer-by-layer milling on the strength of the A/C PCM components are shown, considering the operating loads, calculated loads, and safety factors. The scientific novelties of the obtained results are as follows: the repair method of the A/C PCM components with operational damage using layer-by-layer milling with shaped radial mill to remove PCM layers in the defective area followed by filling the repair area with isotropic polymer paste is improved; the dependencies of geometric and strength parameters of the defective area of the A/C PCM components are established, which allow to easily determine the time of defect development before the destruction of the structure and the temporary period of serviceability of the A/C PCM components. The proposed improvement of the repair method will increase the period of operation of the A/C PCM components in general, which may be the next study.
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