Community Research and Development Information Service - CORDIS


The Aviation Industry has long recognized that the world fleet of aircraft faces specific aging problems such as fatigue and corrosion requiring particular attention. Metallic aircraft components are susceptible to the development of in service cracks by the various processes of fatigue or stress corrosion. These defects are generally developed from sites of local stress concentration, such as fastener holes or other abrupt configuration changes. Conventional methods of repair for metallic aircraft structures usually include the use of bolted or riveted metallic reinforcement. While these procedures may be effective in the short term, they frequently introduce additional stress concentrations leading to further cracking and creating areas that are difficult or impossible to be inspected. Further on, the conventional repairs introduce cutting of damaged areas, which is not indicated in aging cases, due to the reduction of strength. Bonded repair technology is considered today as a reliable alternate to mechanically fastened repairs.
The bonded repairs have achieved significant cost savings. Some benefit is derived from the reduced application time and the longer fatigue life of the repairs, compared to mechanically fastened repairs. Although today, the bonded repairs considered more efficient than the mechanically fastened, each repair is faced as tailored made for each case.
However for the industrial engineering and maintenance production line, there is a lack of appropriate technical manual -standards and specifications- to control the implementation of the repair as integrated method, from the design phase, up to application and quality assurance.

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