Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
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Stitching Effect on Flexural and Interlaminar Properties of MWK Textile Composites

  • Byun, Joon-Hyung (Composites Research Division, Korea Institute of Materials Science) ;
  • Wang, Yi-Qi (Composites Research Division, Korea Institute of Materials Science) ;
  • Um, Moon-Kwang (Composites Research Division, Korea Institute of Materials Science) ;
  • Lee, Sang-Kwan (Composites Research Division, Korea Institute of Materials Science) ;
  • Song, Jung-Il (Department of Mechanical Engineering, Changwon National University) ;
  • Kim, Byung-Sun (Composites Research Division, Korea Institute of Materials Science)
  • Received : 2015.06.18
  • Accepted : 2015.06.29
  • Published : 2015.06.30
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Abstract

The stitching process has been widely utilized for the improvement of through-thickness property of the conventional laminated composites. This paper reports the effects of stitching on the flexural and interlaminar shear properties of multi-axial warp knitted (MWK) composites in order to identify the mechanical property improvements. In order to minimize the geometric uncertainties associated with the stacking pattern of fabrics, the regular lay-up was considered in the examination of the stitching effect. The key parameters are as follows: the stitch spacings, the stitching types, the stitching location, and the location of compression fixture nose. These parameters have little effect on the flexural and interlaminar shear properties, except for the case of stitching location. However, the geometry variations caused by the stitching resulted in minor changes to the mechanical properties consistently. Stitching on the $0^{\circ}$ fibers showed the lowest flexural strength and modulus (12% reduction for both properties). The stitch spacing of 5 mm resulted in 8% reduction for the case of interlaminar strength compared with that of 10 mm spacing.

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References

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