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Funktionalisierte Fasern zur Thermofixierung von PEEK / CF-Preforms für Hochleistungsfaserverbundbauteile: BiKo-PEEK Tow Placement

Funktionalisierte Fasern zur Thermofixierung von PEEK / CF-Preforms für Hochleistungsfaserverbundbauteile: BiKo-PEEK Tow Placement

          
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About the Book

Zur Fertigung von belastungsoptimierten Faserverbundstrukturen existieren derzeit unterschiedliche Verfahren. Neben textiltechnischen Lösungen auf Basis unspezifischer Garne wie dem Tailored Fibre Placement-Verfahren (TFP), kommen bei dem Fibre-Placement-Verfahren und dem Tow-Placement modifizierte Faserbündel zum Einsatz. Durch das erforderliche bebindern oder vorimprägnierte der Verstärkungsfasern lassen sich jedoch im Vergleich zum TFP-Verfahren nur große in-plane Radien umsetzen. Nachteilig beim TFP-Verfahren sind hingegen Filamentschädigungen durch den Stickprozess, Faserondulationen und Harznester, die durch das Einbringen von Nähfäden entstehen. Hinzu kommen Einschränkungen in der maximalen Lagenanzahl eines TFP-Preforms. Die hier vorgestellte neuartige Legetechnologie basiert auf den Einsatz von nano-funktionalisierten Thermoplasten. Die hieraus in Kombination mit Kohlenstofffasern aufgebauten Hybridrovings lassen sich mittels Induktionstechnik thermisch aktivieren und können somit effizient zu maßgeschneiderten Hybridpreforms abgelegt und fixiert werden. Ondulationen der Verstärkungsfasern und Einschränkungen in der Lagenanzahl können mit diesem Verfahren im Vergleich zur TFP-Technologie umgangen werden. Im Thermoformprozess werden diese Preforms zur finalen CFK-Strukturen konsolidiert. Die von EVONIK modifizierten PEEK-Compounds wurden bislang in Zusammensetzungen mit 15, 20 und 30 Gew.-% MagSilica(R) analysiert. Mit den am FIBRE im Schmelzspinnverfahren hergestellten MagSilica(R)-PEEK-Fasern konnten dabei Aufheizgeschwindigkeiten von 680 K/s bis zum Erreichen des vollständigen Aufschmelzens (360 °C) erzielt werden. Das Aufschmelzen von Raumtemperatur erfolgt somit nach ca. 0,5 s. Mit einer einzelnen konventionellen hochfrequenten Induktionsspule (22 mm Länge) wurde im Labormaßstab eine Legegeschwindigkeiten von 2,7 m/min für PEEK erreicht, was einer typischen Legegeschwindigkeit einer TFP-Anlage mit 550 Stichen/min mit 5 mm Stichlänge entspricht. Wird die


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Product Details
  • ISBN-13: 9783735738721
  • Publisher: Books on Demand
  • Binding: Paperback
  • Language: German
  • Returnable: N
  • Sub Title: BiKo-PEEK Tow Placement
  • Width: 148 mm
  • ISBN-10: 3735738729
  • Publisher Date: 13 Aug 2014
  • Height: 210 mm
  • No of Pages: 72
  • Spine Width: 4 mm
  • Weight: 100 gr


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Funktionalisierte Fasern zur Thermofixierung von PEEK / CF-Preforms für Hochleistungsfaserverbundbauteile: BiKo-PEEK Tow Placement
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