Typical technological operations in repairing dents on the PCM honeycomb structures

Products made of composite materials are widely used in all areas of mechanical engineering. As a rule, such materials are applied in aviation in manufacturing the airframe components. Damage to the composite components (dents) is possible during manufacturing process, storage and operation. The known techniques to repair dents on components made of the composite materials have significant drawbacks, such as decrease in strength and aerodynamic characteristics of the components at the repair point, increase in its mass, etc. Proposals were developed to improve the known repair methods. The updated repair technique was considered using the example of the honeycomb skin structures made of the epoxy matrix and a filler of carbon or glass fabric and honeycomb core of the polymer paper. The described technologies for the honeycomb structures repair  would make it possible to restore the original strength, aerodynamic and other important characteristics of the repaired component or the assembly unit. Having the necessary equipment and using the described technological processes, it becomes possible to repair a structure without removing it from the aircraft, which would reduce costs and the repair cycle.

References

[1] Astanin V.V., Glova O.V., Shevchuk O.A. Operational damages of structural elements of aircraft from composite materials and methods of repair. Tekhnologicheskie sistemy, 2011, no. 4, pp. 46–52. (In Russ.).

[2] Reznichenko D.V. Features of repair of honeycomb structures from composite materials by thermal compression molding. Innovatsii i investitsii, 2020, no. 11, pp. 236–240. (In Russ.).

[3] Krysin V.N., Krysin M.V. Tekhnologicheskie protsessy formovaniya, namotki i skleivaniya konstruktsiy [Technological processes of forming, winding and bonding structures]. Moscow, Mashinostroenie Publ., 1989. 234 p. (In Russ.).

[4] Kiva D.S., Dveyrin A.Z., Vasilevskiy E.T. et al. Methods of repair of airframe aggregates made of KM with tubular filler. Tekhnologicheskie sistemy, 2013, no. 2, pp. 57–64. (In Russ.).

[5] Lupkin B.V., Nitka V.S. Method of repairing of assemblies made of composite materials with tubular (honeycomb) filler under field conditions. Otkrytye informatsionnye i kompyuternye integrirovannye tekhnologii, 2014, no. 63, pp. 33–41. (In Russ.).

[6] Avdeev V.V. Sposob remonta izdeliy iz PKM [Method of repairing articles from polymer composite materials]. Patent RU 2694352. Appl. 10.01.2018, publ. 11.07.2019. (In Russ.).

[7] Tekhnologicheskaya instruktsiya TI59-1005-11. Remont sotovykh konstruktsiy iz alyuminievykh splavov i polimernykh KM [Process instruction TI59-1005-11. Repair of honeycomb structures made of aluminium alloys and polymer composites]. Kiev, 2011. 65 p. (In Russ.).

[8] Karpusenko B.F. Repair of structures from composite materials. Tekhnika, ekonomika, informatsiya. Ser. Tekhnika i tekhnologiya, 1985, no. 2, pp. 28–33. (In Russ.).

[9] Vorobey V.V., Markin V.B. Kontrol kachestva izgotovleniya i tekhnologiya remonta kompozitnykh konstruktsiy [Quality control of manufacturing and repair technology of composite structures]. Novosibirsk, Nauka Publ., 2006. 189 p. (In Russ.).

[10] Petrova A.P., Malysheva G.V. Klei, kleevye svyazuyushchie i kleevye prepregi [Adhesives, adhesive binders and adhesive prepregs]. Moscow, VIAM Publ., 2017. 472 p. (In Russ.).

[11] Remont vozdushnykh sudov [Aircraft repair]. Sankt-Petersburg, SPb GUGA Publ., 2005. 90 p. (In Russ.).

[12] Bobryshev A.A., Mukhametzyanova G.F., Zapadnova N.N. et al. Kompozitsionnye materialy [Composite materials]. Naberezhnye Chelny, IPTs Naberezhnochelninskogo instituta KFU Publ., 2018. 31 p. (In Russ.).

[13] Bardis J., Kedward K. Effects of surface preparation on the long-term durability of adhesively bonded composite joints. DOT/FAA/AR-03/53. Office of Aviation Research, 2004. 91 p.

[14] Zhitomirskiy G.I. Konstruktsiya samoletov [Aircraft design]. Moscow, Mashinostroenie Publ., 2018. 416 p. (In Russ.).

[15] Serensen S.V., Zaytsev G.P. Nesushchaya sposobnost tonkostennykh konstruktsiy iz armirovannykh plastikov s defektami [Bearing capacity of thin-walled structures made of reinforced plastics with defects]. Kiev, Naukova Dumka Publ., 1982. 296 p. (In Russ.).

[16] ICAS proceedings. 17th Congress of the International Council of the Aeronautical Sciences. AIAA, 1990. 2270 p.

[17] Baker A., Dutton S. Composite materials for aircraft structures. AIAA, 2004. 599 p.

[18] Hashin Z., Rosen B., Humphreys E. et al. Fiber composite analysis and design: composite materials and laminates. Vol. 1. DOT/FAA/AR95/29. Office of Aviation Research, 1997. 338 p.