Laser trimming cured Graphite/Epoxy (Gr/Ep) laminates with an acceptable heat affected zone (HAZ) has proven to be extremely difficult. The carbon fibers have a high thermal conductivity, and the material fibers and matrix do not simultaneously reach their vaporization temperatures. A new generation of solid state diode-pumped Nd:YAG lasers is being developed by a DARPA program called the Precision Laser Machining Consortium (PLM). The higher beam quality and pulsing techniques utilized by these lasers have been reported to reduce the HAZ of trimmed Gr/Ep laminates. The objective of this research was to evaluate the effect of these advanced laser features when cutting Gr/Ep. Cutting tests performed using high quality electrically pulsed Nd:YAG lasers have yielded smaller HAZ results compared to cuts with a continuous wave CO2 laser. By employing Q-switching modulation to an electrically pulsed beam even smaller HAZ results can be achieved. To effectively trim Gr/Ep laminates with an acceptable HAZ, the key is to minimize the amount of heat added to the cut edge. The combined use of high beam quality Nd:YAG lasers and pulsing techniques appears to be of benefit.


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    Title :

    Laser trimming of graphite-epoxy laminates


    Contributors:
    Ludin, D. (author)


    Publication date :

    1999


    Size :

    8 Seiten, 6 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Laser Trimming of Graphite-Epoxy Laminates

    Ludin, D. / American Helicopter Society | British Library Conference Proceedings | 1999



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