The Repair Design and Technology of Metal Rotor Blades for Mi Family Helicopter - The Approach with the Usage of Reverse Engineering

Sałaciński, Michał; Broda, Piotr; Samoraj, Piotr

doi:10.4271/2017-01-2155

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…The impact of water, temperature variability and the aging effect weaken the area where the section cladding is bonded to the spar. The negative impact of water and temperature on the adhesive layer has been confirmed by the single lap joint and wedge tests [3,4]. The weakening of the adhesive layer accelerates the fatigue process of the connection between the spar and the section cladding.…”

Section: Description Of the Issuementioning

confidence: 94%

A New Approach to Modelling and Testing the Fatigue Strength of Helicopter Rotor Blades during Repair Process

Sałaciński

Kowalski²,

Szmidt

et al. 2019

Fatigue of Aircraft Structures

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The fatigue test was carried out on an element of a rotor blade removed from the Mi-2 helicopter. The purpose of the test was to check the fatigue strength of the repaired rotor blade. Metal composite rotor blades have a metal spar in the form of a box and the trailing sections in the form of metallic honeycomb sandwich panels. The trailing sections are bonded to the spar. The repair had been carried out at the point where the trailing section became debonded from the spar at the Air Force Institute of Technology in Warsaw using a methodology developed for carrying out repairs of rotor blades’ damage. All types of the Mi family helicopters are equipped with metal composite rotors blades. Depending on MTOW (Maximum Take-Off Weight) and destination of helicopters, blades differ in dimensions, but their design solutions are practically the same. For this reason, the developed repair methodology can be used for all characteristic rotor blades structures for Mi helicopters. The fatigue test was performed at the Łukasiewicz - Institute of Aviation in Warsaw, using a hydraulically driven fatigue machine. The fatigue test was carried out by performing over 1.1 million load cycles. In repair places, upon completion of fatigue testing, no damage was found.

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Section: Description Of the Issuementioning

confidence: 94%

A New Approach to Modelling and Testing the Fatigue Strength of Helicopter Rotor Blades during Repair Process

Sałaciński

Kowalski²,

Szmidt

et al. 2019

Fatigue of Aircraft Structures

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show abstract

Technological Aspects of a Reparation of the Leading Edge of Helicopter Main Rotor Blades in Field Conditions

et al. 2022

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The Polish Air Force operates more than one hundred helicopters of the Mi family (manufactured by Mil Helicopters), equipped with metal main rotor blades. The main rotor blades are among the most stressed components of these structures. For this reason, they are subject to more frequent inspections during operation than other components. One type of damage detected during inspections is the local disbonding of fragments of the anti-erosion layer from the leading edge. This harmless-looking damage is very dangerous, since it quickly leads to the complete detachment of the layer. The leading edge, unprotected by the metal cover, erodes rapidly. The detached layer, when thrown away at high speed, endangers other parts of the helicopter, such as the tail rotor, and may cause damage to other helicopters if flying in formation. The technology supplied by the manufacturer to date has not encompassed the field repair of this type of damage. Therefore, efforts were made to develop repair technology for rapid repairs of blades in field conditions during missions of the Task Force White Eagle in Afghanistan. This article presents the concept of repair technology feasible in field conditions and presents the results of post-repair edge tests. Test results to identify the materials used in the construction of the trailing edge are also presented. The results of materials testing facilitated the development of technological processes, and, in the future, will aid the selection of a substitute bonding paste system with similar parameters that are essential for repairs.

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The Repair Design and Technology of Metal Rotor Blades for Mi Family Helicopter - The Approach with the Usage of Reverse Engineering

Cited by 2 publications

References 2 publications

A New Approach to Modelling and Testing the Fatigue Strength of Helicopter Rotor Blades during Repair Process

A New Approach to Modelling and Testing the Fatigue Strength of Helicopter Rotor Blades during Repair Process

Technological Aspects of a Reparation of the Leading Edge of Helicopter Main Rotor Blades in Field Conditions

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