Micromechanical strength modeling and investigation of stitch density effects on 3D orthogonal composites

Ryan L. Karkkainen, Jerome T. Tzeng

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


A 3D orthogonal woven S2-glass composite is investigated using finite element micromechanics to characterize the stiffness and the strength. The methods are applied to a targeted parametric investigation of the effects of stitch density on strength properties and potential benefits of through-thickness reinforcement, such as resistance to transverse shear and delamination, with some consequent loss of in-plane properties. Direct modeling of the exact microstructure from scanning electron microscope visualization provides a precise knowledge of the mechanics and the failure modes of the microstructure under various loading conditions. Modeling results are verified by comparison to experimental data. In-plane stiffness and strength are predicted with 90% or better accuracy. Transverse shear stiffness was less well predicted, but strength was still predicted within 86% accuracy.

Original languageEnglish (US)
Pages (from-to)3125-3142
Number of pages18
JournalJournal of Composite Materials
Issue number25
StatePublished - Dec 2009
Externally publishedYes


  • Finite element method.
  • Micromechanics
  • Textile reinforcement

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Materials Chemistry


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