Finite element micromechanical strength modeling of stitched 3d-orthogonal composites

Ryan Karkkainen, Jerome T. Tzeng, Paul Moy

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Three-dimensional reinforcement is often employed in thick composite parts to increase delamination resistance and through-thickness properties. In the current study, a three-dimensional orthogonal woven S2-glass composite is investigated using finite element micromechanics. A detailed series of photomicrographs has been taken to ensure a precise representation of the layout and dimensions of the weave geometry under consideration. This allows for the development of a representative volume element (RVE) that will accurately depict the chosen material. The RVE structure is modeled directly through three-dimensional FEM. Stiffness and strength are determined using a series of simulated characterization tests upon the RVE with a detailed analysis of the resulting microstress field. Modeling results are verified by comparison to experimental data. Tensile tests and Iosipescu shear tests have been performed to determine in-plane and transverse shear properties. In-plane stiffness and strength are predicted with 90% or better accuracy. Transverse shear properties were less well predicted, but strength was still predicted within 86% accuracy. The micromechanical methods are then employed towards a parametric study of the effect of stitch density on potential improvement of delamination resistance and shear properties, as well as loss of in-plane properties.

Original languageEnglish (US)
Title of host publicationInternational SAMPE Symposium and Exhibition (Proceedings)
StatePublished - 2007
Externally publishedYes
EventSAMPE '07: M and P - From Coast to Coast and Around the World - Baltimore, MD, United States
Duration: Jun 3 2007Jun 7 2007


OtherSAMPE '07: M and P - From Coast to Coast and Around the World
CountryUnited States
CityBaltimore, MD



  • Micromechanics
  • Textile reinforcement

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemical Engineering (miscellaneous)
  • Building and Construction
  • Polymers and Plastics

Cite this

Karkkainen, R., Tzeng, J. T., & Moy, P. (2007). Finite element micromechanical strength modeling of stitched 3d-orthogonal composites. In International SAMPE Symposium and Exhibition (Proceedings) (Vol. 52)