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@PHDTHESIS{Janssen:750674,
      author       = {Janssen, Stefan},
      othercontributors = {Poprawe, Reinhart and Klocke, Fritz},
      title        = {{L}aserstrahl-{B}ohren von {CFK}-{P}reforms; 1. {A}uflage},
      school       = {RWTH Aachen University},
      type         = {Dissertation},
      address      = {Aachen},
      publisher    = {Apprimus Verlag},
      reportid     = {RWTH-2018-230768},
      isbn         = {978-3-86359-674-3},
      series       = {Ergebnisse aus der Lasertechnik},
      pages        = {1 Online-Ressource (VI, 156 Seiten) : Illustrationen},
      year         = {2018},
      note         = {Auch veröffentlicht auf dem Publikationsserver der RWTH
                      Aachen University; Dissertation, RWTH Aachen University,
                      2018},
      abstract     = {The use of components made of carbon fiber-reinforced
                      polymers (CFRP) is becoming increasingly important,
                      especially in the automotive and aviation industries. The
                      targeted weight savings are expected to reduce fuel
                      consumption while maintaining the same mechanical
                      load-bearing capacity of the components. The integration of
                      force transmission elements for the detachable connection of
                      CFRP components to a basic structure places special demands
                      on production technology. Defects such as thermal damage and
                      delamination must be avoided due to the still cost-intensive
                      carbon fibers and the complex process chain for the
                      production of CFRP components. For the drilling of holes for
                      the integration of force transmission elements, both
                      conventional and non-conventional manufacturing processes
                      reach the limits of industrially relevant materialographic
                      and geometric quality. The main reason for this are the
                      different physical properties of the carbon fibers and the
                      matrix. It therefore seems promising to drill the still
                      unimpregnated carbon fiber textile and to infuse it with the
                      matrix material after integration of the force transmission
                      elements. Laser drilling enables mechanical contactless
                      material processing to ensure an undisturbed textile setup.
                      In order to evaluate the achievable geometric and
                      materialographic drilling quality, the effects of laser
                      radiation on the carbon fiber textile must be investigated.
                      The use of long-pulsed laser radiation enables productive
                      material processing. However, the high-energy laser pulses
                      can cause significant thermal damage to the fibers.
                      Alternatively, ultra-short pulsed laser radiation can be
                      used to manufacture a thermally defect free bore, but often
                      at the expense of productivity and aspect ratio. In the
                      context of this work the damage phenomena and their
                      mechanisms of action of laser-drilled, carbon fiber-based
                      textile preforms are investigated. Process strategies are
                      developed both for the processing of long-pulsed and
                      ultra-short pulsed laser radiation in order to reduce or
                      even avoid thermally induced damage. For long-pulsed laser
                      processing, a scanning strategy is developed with which
                      thermal damage can be minimized at high productivity.
                      Furthermore, recommendations for action are being developed,
                      especially for ultra-short pulsed laser radiation, in order
                      to increase productivity and reduce conicity of the bore.},
      cin          = {418710 / 053100},
      ddc          = {620},
      cid          = {$I:(DE-82)418710_20140620$ / $I:(DE-82)053100_20140620$},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      doi          = {10.18154/RWTH-2018-230768},
      url          = {https://publications.rwth-aachen.de/record/750674},
}