Although Fibre Reinforced Plastics (FRP) have been the mainstay of boat hulls for many years, the almost universal adoption of aerospace style composites into marine environments has gradually taken place. Greater resistance to bending stresses has required the use of sandwich constructions to give high strength to weight ration with carbon fibre skins and honeycomb or foam cores. Marine composites require 100% inspection. Statistical sampling on a grid principle has historically given results for residual life on metals; however, composites by their nature are a different matter. The problems therefore facing NDE inspection are that large areas require being 100% inspected in a relatively short time frame, with a high degree of sensitivity. Laser Shearography has been at the forefront of advanced composite inspections in aircraft spacecraft and marine NDE testing. This NDE technology is able to detect weaknesses in the composite caused by disbonds and un-bonds or by inferior adhesive bonds. Rapid yet sensitive inspections at over 5 to 10 sq yards per hour with 100% coverage are not uncommon with laser shearography equipment. Laser Shearography is able detect weaknesses in bonds as variations to the surface strain field in response to a variety of stressing mediums ranging from thermal to vacuum stressing. Advances in the optical arrangements and data processing enables sub-fringe resolution leading to advanced determination of how the material behaves under load. The capability of Laser Shearography to provide effective non-destructive data from 'difficult' materials has created a revolution in aerospace and now marine composites. The technology in its many forms is able to provide a rapid, 100% coverage inspection, with a high degree of probability of detection for marine composite manufacturers.


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    Title :

    Rapid, sensitive inspection of marine composites using laser shearography


    Contributors:
    Gregory, R. (author)


    Publication date :

    2003


    Size :

    8 Seiten, 14 Bilder



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





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