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<p> ± 45° fiber-reinforced composites are widely used in aerospace, automotive, sports equipment, wind energy, and other fields due to their unique structural properties, offering excellent mechanical performance and reliability. This study investigates the effect of specimen width on the tensile properties and failure mechanisms of ± 45° fiber-reinforced composites. By combining digital image correlation (DIC) technology with finite element analysis (FEA), the commonalities and differences in full-field strain distribution, potential damage mechanisms, and crack propagation paths of specimens with different widths are systematically explored. A quantitative relationship between specimen width and load-carrying capacity is established, and the initial stiffness and ductility of the three width specimens are correlated. The results show that the load-carrying capacity of the 100&#xa0;mm width specimens increases by approximately 353 and 133% compared to the 25 and 45&#xa0;mm width specimens, respectively. Additionally, the 100&#xa0;mm specimens exhibit the highest initial stiffness and ductility. The FEA simulation aligns well with the load–displacement curve development trend of the tests, accurately predicting the full-field strain distribution and failure characteristics of the specimens. Unlike existing studies that primarily focus on factors such as fiber orientation angle and fiber content, this research uniquely emphasizes the influence of specimen width on the mechanical performance of fiber-reinforced composites, filling a gap in the current literature. This study provides important references for evaluating the mechanical properties of layered fiber-reinforced composites.</p>

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Width-Dependent Tensile Response and Failure Modes in ±45° Angle-Ply Composite Laminates

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Huajie Qiao,
  • Haipeng Wang,
  • Yang Yang,
  • Xinwen Chen,
  • Guoqian Song,
  • Yuanyuan Wei,
  • Wenfeng Hao

摘要

 ± 45° fiber-reinforced composites are widely used in aerospace, automotive, sports equipment, wind energy, and other fields due to their unique structural properties, offering excellent mechanical performance and reliability. This study investigates the effect of specimen width on the tensile properties and failure mechanisms of ± 45° fiber-reinforced composites. By combining digital image correlation (DIC) technology with finite element analysis (FEA), the commonalities and differences in full-field strain distribution, potential damage mechanisms, and crack propagation paths of specimens with different widths are systematically explored. A quantitative relationship between specimen width and load-carrying capacity is established, and the initial stiffness and ductility of the three width specimens are correlated. The results show that the load-carrying capacity of the 100 mm width specimens increases by approximately 353 and 133% compared to the 25 and 45 mm width specimens, respectively. Additionally, the 100 mm specimens exhibit the highest initial stiffness and ductility. The FEA simulation aligns well with the load–displacement curve development trend of the tests, accurately predicting the full-field strain distribution and failure characteristics of the specimens. Unlike existing studies that primarily focus on factors such as fiber orientation angle and fiber content, this research uniquely emphasizes the influence of specimen width on the mechanical performance of fiber-reinforced composites, filling a gap in the current literature. This study provides important references for evaluating the mechanical properties of layered fiber-reinforced composites.