Rapid composite bonded repair for helicopter tail drive shafts

Li, H.C.H.; Wang, J.; Baker, A.A.

doi:10.1016/j.compositesb.2011.08.012

Cited by 18 publications

(10 citation statements)

References 3 publications

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“…A typical helicopter tail drive shaft is considered in this study which is made of a high strength aluminium tube material (2024-T42) with external diameter D = 89mm, thickness t = 2ּ4mm and Young's modulus E = 73 GPa. The design limit load = 1,300Nm, design ultimate load = 1,950Nm and operational speed = 4,100RPM (2) .…”

Section: Battle Damage and Repair Methodsmentioning

confidence: 99%

“…For battle damage repairs, a riveted metallic patch repair is often used, particularly for repair of metallic components. This method can be applied rapidly with minimum portable materials/ tools and, in contrast to a higher quality bonded repair (2) , does not require special non-destructiveinspection (NDI) methods for repair quality inspection. Though the riveted BDR to TDSs has been considered as a traditional repair method, little has been reported in the literature regarding the detailed repair method and effectiveness (3) .…”

Section: Introductionmentioning

confidence: 99%

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Riveted patch repairs for helicopter tail drive shafts with battle damage

Wang

Baker

Bitton³

2014

Aeronaut. j. (1968)

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The ability to repair battle damage in a helicopter tail drive shaft (TDS) caused by small arms fire is a very important capability. A successful repair will enable the helicopter to continue its mission or at least allow it to return safely to base. This paper describes assessment of conventional and novel repair techniques using riveted metallic patches to restore the balance and strength of a damaged TDS. Analytical approaches are provided for the design of the repair. Modal analyses indicated that the effect of repair on change of the natural frequency of the TDS was negligible. An experimental testing program was conducted to validate the proposed repair methods. It has been demonstrated that the proposed repair methods achieved sufficient balance restoration by a defined repair procedure, assuming the unbalance could not be measured during a repair in the field. The conventional thin, single aluminium sheet, riveted repair significantly restored static strength. However, it only gave a fatigue life of 15hrs, and thus the repaired shaft may only be used for limited time for a military mission. The improved thick, two-half aluminium shell, riveted repair had sufficient static strength and met the 100-hour fatigue requirement.

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Section: Battle Damage and Repair Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Riveted patch repairs for helicopter tail drive shafts with battle damage

Wang

Baker

Bitton³

2014

Aeronaut. j. (1968)

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“…9,10 However, in emergency cases, such as when a helicopter shaft is damaged in the battlefield by bullet strikes, these patches can be temporarily used to repair helicopter components. 11–13 Although the use of the composite patches dates back to 30 years ago, it has now been approved only for grade 2 important members. 14,15 Reasons for the patch failure include increased SIF on the main plate and increased shear strain or peel stress on the adhesive, separation, delamination, moisture absorption, etc.…”

Section: Introductionmentioning

confidence: 99%

A review on composite patch repairs and the most important parameters affecting its efficiency and durability

Mohammadi

Yousefi

Khazaei

2020

Journal of Reinforced Plastics and Composites

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In many industries, when replacement of a part is not possible or economic, the repair is done. One of the best methods for repairing metal and composite parts is using composite patches. Repairing with a composite patch is a widespread field to extend the service life of the cracked components. This technique is more structurally efficient with fewer damages on the structure than others. The bonded patch offers many advantages over a mechanically fastened doubler, which include improved fatigue behavior, reduced corrosion, and easy conformance to complex aerodynamic contours. In this article, advantages of the composite patch and its efficiency and durability are discussed, and the most important parameters (patch and adhesive thickness, patch separation, residual stress, patch length and width, etc.) affecting its performance are studied based on the latest available references.

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“…However, in emergency cases, such as when a helicopter shaft is damaged in the battlefield by bullet strikes, these patches can be temporarily used to repair helicopter components. [11][12][13] The success of the patch depends first on the adhesive and then on the patch material. 7 Although the use of the composite patch dates back to 30 years ago, it has now been approved only for grade 2 important members.…”

Section: Introductionmentioning

confidence: 99%

Parametric investigation of one-sided composite patch efficiency for repairing crack in mixed mode considering different thicknesses of the main plate

Mohammadi

2020

Journal of Composite Materials

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In this paper, parameters affecting the performance and durability of a one-sided composite patch for mixed-mode crack repairing is investigated, considering different thicknesses of the main plate. In different references, there is no unity of opinion on the effect of various parameters on the performance and durability of one-sided patches. In the present study, to eliminate this disagreement, 3D finite element method is employed. It is clear that the effect of each parameter strongly depends on the thickness of the repaired plate. Among the investigated parameters, the patch material, length and width of the patch, and adhesive thickness are more important and studied in this paper. Results reveal that the effect of different parameters on the performance and durability of one-sided patches depends not only on the thickness of the main plate but also on the patch material.

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Rapid composite bonded repair for helicopter tail drive shafts

Cited by 18 publications

References 3 publications

Riveted patch repairs for helicopter tail drive shafts with battle damage

Riveted patch repairs for helicopter tail drive shafts with battle damage

A review on composite patch repairs and the most important parameters affecting its efficiency and durability

Parametric investigation of one-sided composite patch efficiency for repairing crack in mixed mode considering different thicknesses of the main plate

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