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<p>Large-tow chain-stitched composites are promising for efficient composite manufacturing, but edge-notches may strongly affect their load-carrying capacity. In this work, T700-48&#xa0;K carbon fiber/epoxy chain-stitched composites with a balanced [± 45]<sub>6</sub> layup were tested with circle-shaped, diamond-shaped, and slit-shaped edge-notches. Quasi-static tensile tests were combined with digital image correlation, fracture morphology observation, and macro-meso finite element analysis to examine the edge-notch-shape effect. The results show that the introduction of edge-notches causes only a small change in stiffness, while the tensile strength decreases markedly. The average strengths of the circle-shaped, diamond-shaped, and slit-shaped edge-notched specimens were 74.00, 67.29, and 58.24&#xa0;MPa, respectively, which are 33.3%, 39.4%, and 47.5% lower than that of the unnotched specimens. The predicted strength errors of the three edge-notched specimens were all below 3%. Among the three notch types, the slit-shaped notch led to the most severe strain concentration and localized damage, whereas the circle-shaped notch showed a smoother stress transfer and the highest residual strength. The results provide a basis for notch-shape selection and damage evaluation in large-tow chain-stitched composite structures.</p>

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Shape-Dependent Mechanical Behavior of Edge-Notched Large-Tow Chain-Stitch Composites with Bi-Directional Symmetric Layup: Numerical and Experimental Investigation

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Xu Tong,
  • Wei Jing,
  • Yuanyuan Fang,
  • Junchao Zhu,
  • Huabing Wen,
  • Wantao Guo,
  • Junhua Guo

摘要

Large-tow chain-stitched composites are promising for efficient composite manufacturing, but edge-notches may strongly affect their load-carrying capacity. In this work, T700-48 K carbon fiber/epoxy chain-stitched composites with a balanced [± 45]6 layup were tested with circle-shaped, diamond-shaped, and slit-shaped edge-notches. Quasi-static tensile tests were combined with digital image correlation, fracture morphology observation, and macro-meso finite element analysis to examine the edge-notch-shape effect. The results show that the introduction of edge-notches causes only a small change in stiffness, while the tensile strength decreases markedly. The average strengths of the circle-shaped, diamond-shaped, and slit-shaped edge-notched specimens were 74.00, 67.29, and 58.24 MPa, respectively, which are 33.3%, 39.4%, and 47.5% lower than that of the unnotched specimens. The predicted strength errors of the three edge-notched specimens were all below 3%. Among the three notch types, the slit-shaped notch led to the most severe strain concentration and localized damage, whereas the circle-shaped notch showed a smoother stress transfer and the highest residual strength. The results provide a basis for notch-shape selection and damage evaluation in large-tow chain-stitched composite structures.