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<p>Peeling-based recycling of thermoplastic laminated composites features major advantages in comparison with the current composite recycling methods based on shredding or pyrolysis. The athermal recovery of laminae with preserved mechanical properties enables value retention and opens the way for a closed material cycle for composites. However, in order to separate and recover the laminae of a laminate, an interlaminar crack needs to be initiated and propagated. It has been demonstrated in the literature that such cracks can be initiated using an impact load on a notched composite specimen. In the present work, crack initiation experiments are conducted using various notch geometries in a setup imposing a translational rotation to the impacted side of the notch. For each notch geometry, the quality and reproducibility of the generated interlaminar cracks are evaluated. The interaction between the crack and the reinforcement of the composite is also investigated using computed X-ray tomography. Finally, recommendations are provided in order to obtain reproducible crack initiations for a future use in an industrial recycling process.</p>

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Impact-Induced Interlaminar Crack Initiation in Notched Thermoplastic Composites for Single-Layer Recovery Purposes: Role of the Notch Geometry

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月1日

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  • S. Strahringer,
  • M. Imbert,
  • M. May,
  • F. Balle

摘要

Peeling-based recycling of thermoplastic laminated composites features major advantages in comparison with the current composite recycling methods based on shredding or pyrolysis. The athermal recovery of laminae with preserved mechanical properties enables value retention and opens the way for a closed material cycle for composites. However, in order to separate and recover the laminae of a laminate, an interlaminar crack needs to be initiated and propagated. It has been demonstrated in the literature that such cracks can be initiated using an impact load on a notched composite specimen. In the present work, crack initiation experiments are conducted using various notch geometries in a setup imposing a translational rotation to the impacted side of the notch. For each notch geometry, the quality and reproducibility of the generated interlaminar cracks are evaluated. The interaction between the crack and the reinforcement of the composite is also investigated using computed X-ray tomography. Finally, recommendations are provided in order to obtain reproducible crack initiations for a future use in an industrial recycling process.