Applied Composite Materials

, Volume 26, Issue 1, pp 371–387 | Cite as

Investigation on the Yarn Squeezing Effect of Three Dimensional Full Five Directional Braided Composites

  • Long Hu
  • Guoquan TaoEmail author
  • Zhenguo Liu
  • Yibo Wang
  • Jixuan Ya


The influence of yarn squeezing effect on the geometric morphology and mechanical property of the three dimensional full five directional (3DF5D) braided composites is explored. Spatial path and cross-section shape of the yarns in the braided structure are characterized based on the micro computed tomography (micro CT) scanning images. The yarn distortion due to the squeezing effect is discussed and mathematical morphology of the yarn geometry is established. A new repeated unit cell (RUC) model of 3DF5D braided composites considering yarn squeezing effect is developed. Based on this model, mechanical properties of 3DF5D braided composites are analyzed. Good agreement is obtained between the predicted and experiment results. Moreover, the stress distribution of the new RUC model are compared with original RUC model, showing that the squeezing effect significantly increases the stress concentration level of the axial yarns.


Three dimensional braided composites Yarn squeezing effect Micro computed tomography Repeated unit cell model 


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© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Aeronautic Science and EngineeringBeihang University (BUAA)BeijingPeople’s Republic of China
  2. 2.Shanghai Electric Wind Co. LtdShanghaiPeople’s Republic of China

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