Fracture surface evolution and apparent delamination toughness in split composite beam specimens subjected to mixed mode I-III loading

Allison L. Horner, Barry D Davidson

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

The influence of specimen twisting during global anti-plane shear loading in composite split beam specimens is studied. Tests were conducted on specimens with different thicknesses and delamination lengths to produce different amounts of specimen twisting prior to fracture. It is shown that specimen twisting causes mode I stresses to develop, thereby producing mixed mode I-III conditions along the delamination front. This causes near-tip transverse cracks to initiate, prior to delamination advance, at an orientation related to the mode mix. Unlike in homogeneous materials, transverse crack extension is accompanied by planar delamination advance, and transverse crack rotation during extension is restricted by the laminate's fibers. The overall fracture surface evolution is therefore strongly controlled by specimen geometry. The influence of these findings on the apparent delamination toughness as obtained from composite split beam and other types of mode III tests is discussed.

Original languageEnglish (US)
Pages (from-to)92-102
Number of pages11
JournalComposites Part A: Applied Science and Manufacturing
Volume79
DOIs
StatePublished - Dec 1 2015

Keywords

  • A. Polymer-matrix composites (PMCs)
  • B. Delamination
  • B. Transverse cracking
  • D. Mechanical testing

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials

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