Mechanism of damage propagation to the propeller blades of composite materials with exposed damaging elements
Aeronautical and Space-Rocket Engineering
Strength and thermal conditions of flying vehicles
Аuthors1*, 2**, 2***, 1
1. Center of the accident investigations of the state aircraft «Central Research Institute of the Air Force» of the Russian Defense Ministry, 3/5, Aerodromnaya str., Shchelkovo, Moscow region, 141103, Russia
2. Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia
The article discusses the importance of the problem of reducing the life cycle of the propeller (propfans) because of foreign objects and elements of the weapons hits during combat operations connected with protected propeller blades (propfans) from exposure to particulate matter.
Classification of combat damaged items of military equipment caused by the impact of a weapon of the enemy and related factors is considered.
The paper describes the mechanism of formation and further damages evolution of propeller blades (propfan) made of composite material with the defeat of the elements of weapons.
The results of multiple damage simulated with the help of software CAE ANSYS / LS-DYNA are shown. These results clearly show that there is a change of the physical and mechanical properties of the material associated with the formation of bulk or surface hardening, which leads to the appearance of residual stresses, which is confirmed by experimental data. Also, there are the results of multiple injuries received in experimental studies of impact resistance with blade AV-112 propeller propulsion system of military-transport aircraft IL-112, which shows that the striking element is overcoming obstacles in the form of layers of fiberglass, increases the deformation zone that appears in a large area of the opposing barrier damage as size holes, and on the thickness of the material bundle and exfoliation area tape on the exit side.
The article shows the dependence of the area of separation against thickness of the bundle composite propeller blade resulting from an experiment and an example of the phase diagram characterizing the behavior fragments of the projectile in the form of a cube when struck by the blade in the composite spar at various angles of approach. The result is determined by the collision of impact velocity and the angle of the meeting.
In the article the authors point out the adequacy of the emergence and development of damage to the propeller blades (propfans) made from composite material with the defeat of the elements of weapons, confirmed by the results of calculations and experimental studies conducted in VUNTS Force VVA named after Professor N.E. Zhukovsky and Yu.A. Gagarin in the department Design of Aircraft Engines.
Keywords:blade propeller, combat damage, submunitions, composite material
Bogdanov M.A., Gorskii A.N., Kruglov V.V., Neskoromnyi E.V., Pototskii M.V., Chetverdin M.Yu. Trudy VVIA im. N.E. Zhukovskogo Perspektivy razvitiya aviatsionnykh kompleksov. Moscow, 2008, pp. 116-121.
Bogdanov M.A., Gorskii A.N., Evdokimov A.A., Neskoromnyi E.V., Pototskii M.V. Trudy VVIA im. N.E. Zhukovskogo Perspektivy razvitiya aviatsionnykh kompleksov. Moscow, 2008, pp. 109-115.
Bogdanov M.A., Gorskii A.N., Neskoromnyi E.V., Pototskii M.V. Trudy VVIA im. N.E. Zhukovskogo Perspektivy razvitiya aviatsionnykh kompleksov. Moscow, 2008, pp. 122-138.
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