• Journal of the military operations research society of Korea
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• v.36 no.1
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• pp.91-102
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• 2010

Doubler repair is one of the frequently applied methods to repair cracks which occur at the structure of aircraft weapon systems. The requirement of the doubler repair for some of aging aircraft has increased more recently. However very few researches have been conducted until now. In this paper, the effect of the various doubler repair methods was evaluated. Especially, the relationship between the array of revet and the effect of stress concentration was investigated. To calculate variation of the stress with different repair methods, commercial FEA program was utilized. As a result, it was shown that the main factor for the variation of stress is pitch and number of revet line. Furthermore the optimized array of revet for the specific geometries of doubler was suggested.

• Journal of the Society of Naval Architects of Korea
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• v.54 no.3
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• pp.242-249
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• 2017

A design system for doubler reinforcement of the ship plate members subjected to in-plane shear and biaxial compressive loads was developed. This design system of doubler reinforcement on ship plate members established by design supporting system and this system was based on the buckling evaluation process of ship plate members for these in-plane loads. Each design parameters were suggested by equations as the form of influence coefficients for the doubler reinforcement subjected to the various in-plane loads including shear load. Strength of doubler plate member reinforced on the plate member could be suggested by the equivalent flat plate thickness after the consideration of corelation equations in the design system of doubler reinforcement. Level of strength recovery of ship plate members for these in-plane loads according to the local reinforcement by doubler could be suggested by use of this design system in the initial repair design stage of shipyards.