Specimen design for through-thickness testing of 3D woven textile composites

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

1 Scopus citations

Abstract

Three-dimensional reinforcement of thick composite parts is utilized to increase delamination resistance and through-thickness properties, which often represent the weak link of such structures. Stitching, z-pinning, or a three-dimensional textile weave may be employed. In the current study of a three-dimensional orthogonal woven glass-epoxy composite, a specimen is designed for cases in which a sufficiently thick specimen for standard test setups cannot be created due to manufacturing limitations. A minimum width is dictated by the need to capture a sufficient number of through-thickness stitches in the specimen cross-section. Thickness is limited by manufacturing feasibility, as stitches can only penetrate through a certain thickness, and further limitation is imposed by the ability of resin to penetrate the fiber preform during cure. Thus a specimen must accommodate this low aspect ratio geometry. To this end, several specimens have been designed using FEM analysis and validated experimentally. Multiple specimen types were investigated to determine an optimum specimen and to ensure geometry independence of the obtained properties. Optimized specimens have shown good agreement with stiffness predictions as well as promising, consistent results for strength determination.

Original languageEnglish (US)
Title of host publicationSociety for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2009
Pages2492-2498
Number of pages7
StatePublished - Dec 1 2009
EventSEM Annual Conference and Exposition on Experimental and Applied Mechanics 2009 - Albuquerque, NM, United States
Duration: Jun 1 2009Jun 4 2009

Publication series

NameSociety for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2009
Volume4

Other

OtherSEM Annual Conference and Exposition on Experimental and Applied Mechanics 2009
CountryUnited States
CityAlbuquerque, NM
Period6/1/096/4/09

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ASJC Scopus subject areas

  • Computational Mechanics

Cite this

Karkkainen, R. L., & Moy, P. (2009). Specimen design for through-thickness testing of 3D woven textile composites. In Society for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2009 (pp. 2492-2498). (Society for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2009; Vol. 4).