Influence of in-plane shear on kink-plane orientation in a unidirectional fibre composite

D. Wilhelmsson, Lars Pilgaard Mikkelsen, Søren Fæster, L. E. Asp*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

84 Downloads (Pure)

Abstract

Kink-band formation is the governing failure mechanism for compressive failure of fibre reinforced composites. Here, kink-plane orientation, describing the direction of kink-band formation, is studied using X-ray computed tomography (CT). Unnotched unidirectional specimens with off-axis angles ranging from 0° to 20° are tested in compression. The measured compressive strength is found practically constant for off-axis angles between 0° and 10°. For an off-axis angle of 15° the compressive strength drops dramatically. CT-results reveal this drop to be consistent with a transition from out-of-plane to in-plane dominated kinking. Furthermore, results show the kink-plane angle to be linearly dependant on off-axis angle, and hence in-plane shear stress. A three-dimensional finite element model considering measured fibre misalignment angles through its volume is generated for numerical analysis. Numerical predictions based on the LaRC05 kinking criterion are found to qualitatively capture the experimentally observed effects of off-axis angle on kink-plane orientation.

Original languageEnglish
JournalComposites Part A: Applied Science and Manufacturing
Volume119
Pages (from-to)283-290
Number of pages8
ISSN1359-835X
DOIs
Publication statusPublished - 2019

Keywords

  • Carbon fibres
  • Finite element analysis (FEA)
  • CT analysis
  • Mechanical testing

Fingerprint Dive into the research topics of 'Influence of in-plane shear on kink-plane orientation in a unidirectional fibre composite'. Together they form a unique fingerprint.

Cite this