Mode I intralaminar fracture toughness of 2D woven carbon fibre reinforced composites: Pre-crack tip radius sensitivity

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The determination of intralaminar fracture toughness for carbon fibre composites has been the subject of several studies. However, pre-crack geometry has not been extensively investigated. Here we assess the sensitivity of the mode I intralaminar fracture toughness to pre-crack tip radius, numerically and experimentally. Two sets of five scaled Double Edge Notch Tension (DENT) specimens were made from the same 2D woven carbon fibre composite laminate, one with blunt notches and another with sharp pre-cracks, and tested using the size effect method. Experimental results depicted a higher fracture toughness for the sharp pre-crack specimens. A numerical investigation was then performed on the geometric correction factor used in the data reduction, to analyse whether the differing radii affect the stress intensity at the crack tip, which may explain the difference in experimental results. However, the correction factor for the two radii, which assumes a slit crack propagating from the initial pre-crack tip, converged to the ideal slit crack solution, before reaching peak load, for all specimen sizes tested. Further investigation is required to assess the difference in experimental fracture toughness values.

Original languageEnglish
Title of host publicationECCM 2018 - 18th European Conference on Composite Materials
PublisherApplied Mechanics Laboratory
ISBN (Electronic)9781510896932
Publication statusPublished - 01 Jan 2018
Event18th European Conference on Composite Materials, ECCM 2018 - Athens, Greece
Duration: 24 Jun 201828 Jun 2018

Publication series

NameECCM 2018 - 18th European Conference on Composite Materials

Conference

Conference18th European Conference on Composite Materials, ECCM 2018
CountryGreece
CityAthens
Period24/06/201828/06/2018

Keywords

  • 2D woven composites
  • Mode I intralaminar fracture toughness
  • Pre-crack sensitivity
  • R-curve
  • Size-effect method

ASJC Scopus subject areas

  • Ceramics and Composites

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  • Cite this

    Dalli, D., Catalanotti, G., & Falzon, B. G. (2018). Mode I intralaminar fracture toughness of 2D woven carbon fibre reinforced composites: Pre-crack tip radius sensitivity. In ECCM 2018 - 18th European Conference on Composite Materials (ECCM 2018 - 18th European Conference on Composite Materials). Applied Mechanics Laboratory.