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<p>Carbon nanotube-reinforced aluminum matrix composites (CNTs/Al) exhibit excellent properties and strong potential for aerospace applications. In this study, an aluminum matrix composite containing 1.5 wt% carbon nanotubes was subjected to asymmetric cyclic shear loading, under which pronounced ratcheting behavior was observed. Cyclic shear tests with varying combinations of mean stress and stress amplitude revealed that increasing stress amplitude results in larger initial ratcheting strain, higher strain rate, and a markedly reduced fatigue life. Changes in mean stress produced similar effects, although stress amplitude had a more dominant influence on ratcheting behavior. SEM and EBSD analyses of fracture morphology and microstructural evolution before and after loading showed that carbon nanotubes enhance mechanical performance while inhibiting microcrack propagation. Significant post-loading variations in grain orientation, grain size, and dislocation density were observed, consistent with the macroscopic ratcheting response. These results provide insight into mitigating premature shear-induced failure in practical applications.</p>

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Ratcheting Phenomena and Microstructural Analysis of Carbon Nanotube-Reinforced Aluminum Matrix Composites Subjected to Cyclic Shear

  • 期刊论文

  • 发表日期：

    2026年2月5日

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  • Yihao Liu,
  • Longhao Guo,
  • Tao Yue,
  • Zhang Kai,
  • Zhenming Yue,
  • Zhiyong Zhao

摘要

Carbon nanotube-reinforced aluminum matrix composites (CNTs/Al) exhibit excellent properties and strong potential for aerospace applications. In this study, an aluminum matrix composite containing 1.5 wt% carbon nanotubes was subjected to asymmetric cyclic shear loading, under which pronounced ratcheting behavior was observed. Cyclic shear tests with varying combinations of mean stress and stress amplitude revealed that increasing stress amplitude results in larger initial ratcheting strain, higher strain rate, and a markedly reduced fatigue life. Changes in mean stress produced similar effects, although stress amplitude had a more dominant influence on ratcheting behavior. SEM and EBSD analyses of fracture morphology and microstructural evolution before and after loading showed that carbon nanotubes enhance mechanical performance while inhibiting microcrack propagation. Significant post-loading variations in grain orientation, grain size, and dislocation density were observed, consistent with the macroscopic ratcheting response. These results provide insight into mitigating premature shear-induced failure in practical applications.