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<p>To reveal the damage behavior of materials, cutting mechanics models of convex and concave deformation single fiber were established at the microscopic level in CFRP pipes drilling. Macroscopically, unidirectional CFRP pipes with different diameters were designed for drilling experiments to analyze the causes of drilling defects on convex surfaces and concave surfaces and to explore the relationship between pipe diameter and hole quality. The results turned out that, for convex drilling, the hole entry damage is relatively minor; in contrast, extensive delamination damage occurs at the hole exit, which escalates with increases in feed rate and pipe diameter. Notably, peeling appears at the hole entry during concave drilling at larger feed rate (&gt; 0.3&#xa0;mm/r). The damage at both the entry and exit of holes during concave drilling initially increases and subsequently decreases as the pipe diameter grows larger. Compared to concave drilling, the hole exit damage of convex drilling is greater. To sum up, the twists drill (diameter Φ6 mm) is suitable for drilling CFRP pipes with smaller pipe diameters at low feed rates and can obtain holes with less damage. The single fiber cutting mechanics model developed and the experimental results obtained in this article can serve as a robust theoretical and practical foundation for achieving high-quality processing of CFRP pipes.</p>

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Mechanical modeling and material damage behavior of CFRP pipe drilling

  • 期刊论文

  • 发表日期：

    2025年3月20日

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  • Lingyan Tang,
  • Siwen Tang,
  • Xinyi Qiu,
  • Pengnan Li,
  • Shujian Li,
  • Changping Li,
  • Hailang Liu

摘要

To reveal the damage behavior of materials, cutting mechanics models of convex and concave deformation single fiber were established at the microscopic level in CFRP pipes drilling. Macroscopically, unidirectional CFRP pipes with different diameters were designed for drilling experiments to analyze the causes of drilling defects on convex surfaces and concave surfaces and to explore the relationship between pipe diameter and hole quality. The results turned out that, for convex drilling, the hole entry damage is relatively minor; in contrast, extensive delamination damage occurs at the hole exit, which escalates with increases in feed rate and pipe diameter. Notably, peeling appears at the hole entry during concave drilling at larger feed rate (> 0.3 mm/r). The damage at both the entry and exit of holes during concave drilling initially increases and subsequently decreases as the pipe diameter grows larger. Compared to concave drilling, the hole exit damage of convex drilling is greater. To sum up, the twists drill (diameter Φ6 mm) is suitable for drilling CFRP pipes with smaller pipe diameters at low feed rates and can obtain holes with less damage. The single fiber cutting mechanics model developed and the experimental results obtained in this article can serve as a robust theoretical and practical foundation for achieving high-quality processing of CFRP pipes.