Smoothing artificial stress concentrations in voxel-based models of textile composites

Guodong Fang, Bassam El Said, Dmitry Ivanov, Stephen Hallett*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

26 Citations (Scopus)
390 Downloads (Pure)

Abstract

Voxel meshing is an effective method to discretise the internal architectures of multi-phase materials. Spurious stresses are however introduced in the vicinity of a multi-material interface due to the stepped, block-like representation of smooth boundaries. A stress averaging technique is presented to eliminate artificial mesh-imposed stress concentrations. The effect of the local averaging domain size, averaging weight function, and mesh dependence is explored. The voxel finite element method with stress averaging is then further developed to study progressive damage propagation and failure analysis of composites. An additional control, based on the failure plane angle of each element, is included to ensure propagation of damage in the direction dictated by the physics of the process rather than mesh artefacts. It is found that the stress averaging technique is an effective way to alleviate local stress concentrations and can ensure correct damage and failure mode prediction when compared to a conformal mesh.
Original languageEnglish
Pages (from-to)270–284
Number of pages15
JournalComposites Part A: Applied Science and Manufacturing
Volume80
Early online date30 Oct 2015
DOIs
Publication statusPublished - Jan 2016

Keywords

  • A. Fabrics/textiles
  • B. Stress concentrations
  • B. Mechanical properties
  • Voxel mesh

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