Effects of differently impregnated carbon fiber reinforced tapes with polyamide 6 on further processing

V. Radlmaier, H. Baumann, P. V. Brudzinski, A. Erber, H. Koerber, K. Drechsler

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

In this study, the impregnation progress of unidirectional carbon fiber reinforced tapes (UD tapes) with different initial degrees of impregnation (DOIi) is followed throughout a production process chain for carbon fiber reinforced thermoplastics (CFRTP). Partially impregnated tapes can be manufactured with reduced cycle times along with cost savings. They are assumed to be completely impregnated throughout the repeated heating processes during CFRTP manufacture. UD tapes with polyamide 6 matrix were produced in a double-belt press yielding a DOIi of 80 %, 90 % and 100 %. The tapes were stacked and consolidated in a press with different dwell times and some laminates were additionally thermoformed. Longitudinal and transverse flexural tests were conducted to evaluate the effect of the DOIi on composite properties. Micrographs of tapes and test panels were post-processed to evaluate the DOIi and the final degree of impregnation (DOIf). Impregnation progress throughout further processing was observed for all test panels. Complete impregnation was reached for 90 % impregnated tapes after a dwell time of 300 s and after thermoforming. After pressing tapes with a DOIi of 80 % for 300 s the final DOIf of 95 % indicated that longer dwell times are required to complete impregnation. The longitudinal flexural strength of completely and 90 % impregnated tapes is comparable after pressing for 300 s and after thermoforming. The transverse flexural strength is affected by the DOIi to a stronger extent indicating that dwell times need to be increased to enable fiber bed relaxation and consolidation of tape plies with an DOIi of less than 100 %.

Original languageEnglish
Title of host publicationECCM 2016 - Proceeding of the 17th European Conference on Composite Materials
PublisherEuropean Conference on Composite Materials, ECCM
ISBN (Electronic)9783000533877
StatePublished - 2016
Event17th European Conference on Composite Materials, ECCM 2016 - Munich, Germany
Duration: 26 Jun 201630 Jun 2016

Publication series

NameECCM 2016 - Proceeding of the 17th European Conference on Composite Materials

Conference

Conference17th European Conference on Composite Materials, ECCM 2016
Country/TerritoryGermany
CityMunich
Period26/06/1630/06/16

Keywords

  • Degree of impregnation
  • Flexural properties
  • Polyamide 6
  • Tapes

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