Vertically-aligned short E-glass fibre core sandwich composite: Production and evaluation

Research output: Contribution to journalArticlepeer-review

Authors

  • Robbie White
  • Benjamin A Fernando
  • Mark A Paget
  • Ashwini Prasad

Colleges, School and Institutes

Abstract

This paper reports on the production and evaluation of a new class of “Z-axis” composite sandwich panel where the core consists of a dense array of vertically-aligned, 3 mm long E-glass fibre composite “beams”. The E-glass fibre bundles were aligned using electrostatic charging. A procedure was developed to retain the orientation of the short-fibre bundles whilst they were impregnated and cured with an epoxy/amine resin system. The skins were manufactured from 4-ply carbon/epoxy prepregs with a layup sequence of (0,90)s. The out-of-plane compressive strength of these Z-axis composites was found to be 25.2 and 15.2 times greater than equivalent sandwich panels made with Nomex® and aluminium honeycomb cores respectively. Their compressive strength was found to increase in proportion to the density of the core. Buckling and fracture of the vertically-aligned Z-axis composite were the predominant failure modes observed. The shear and flexural properties of the Z-axis composites were comparable to equivalent honeycomb sandwich panels manufactured from Nomex® and aluminium honeycomb cores.

Details

Original languageEnglish
Pages (from-to)109963622199388
JournalJournal of Sandwich Structures and Materials
Early online date27 Feb 2021
Publication statusE-pub ahead of print - 27 Feb 2021

Keywords

  • Sandwich composite, honeycomb, vertically-aligned, impregnation, flatwise compression