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<p>Laminated components inevitably incur micro-damages during preparation, transportation, and assembly, compromising their structural stability. The variable stiffness (VS) layup design method broadens the design possibilities for FRP structures and diminishes their susceptibility to internal micro-damages. This study investigates the progressive buckling performance of a Fiber reinforced polymer (FRP) plate under uniaxial compression with pre-set delamination damages of varying sizes (<i>D</i> = 15&#xa0;mm, <i>D</i> = 20&#xa0;mm, <i>D</i> = 25&#xa0;mm) and without damage. The impact of design parameters of VS plies on buckling behavior is characterized, and an analytical relationship between them is developed by taking the aspect ratio of plates into account. Post-buckling responses were experimentally studied and captured using a digital image correlation (DIC) system. The optimized VS laminated plate shows a 41.1% increase in buckling stiffness and a 113.58% increase in ultimate load capacity over conventional stiffness (CS) specimens. The study concludes that larger delamination sizes reduce the ultimate load capacity of FRP laminates. To enhance the buckling resistance and damage tolerance of VS laminates, thereby improving their structural stability, this study introduces an innovative analytical algorithm for optimizing the layup configuration. This algorithm allows for a quantitative analysis of how different design variables impact the laminate's performance. Furthermore, to validate the accuracy of our analytical approach, we employ a DIC system in our experiments to confirm the post-buckling responses.</p>

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Buckling Performance of Variable Stiffness Laminates Under Delamination Damage

  • 期刊论文

  • 发表日期：

    2025年3月21日

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  • C. J. Song,
  • X. J. Niu,
  • X. Zhang

摘要

Laminated components inevitably incur micro-damages during preparation, transportation, and assembly, compromising their structural stability. The variable stiffness (VS) layup design method broadens the design possibilities for FRP structures and diminishes their susceptibility to internal micro-damages. This study investigates the progressive buckling performance of a Fiber reinforced polymer (FRP) plate under uniaxial compression with pre-set delamination damages of varying sizes (D = 15 mm, D = 20 mm, D = 25 mm) and without damage. The impact of design parameters of VS plies on buckling behavior is characterized, and an analytical relationship between them is developed by taking the aspect ratio of plates into account. Post-buckling responses were experimentally studied and captured using a digital image correlation (DIC) system. The optimized VS laminated plate shows a 41.1% increase in buckling stiffness and a 113.58% increase in ultimate load capacity over conventional stiffness (CS) specimens. The study concludes that larger delamination sizes reduce the ultimate load capacity of FRP laminates. To enhance the buckling resistance and damage tolerance of VS laminates, thereby improving their structural stability, this study introduces an innovative analytical algorithm for optimizing the layup configuration. This algorithm allows for a quantitative analysis of how different design variables impact the laminate's performance. Furthermore, to validate the accuracy of our analytical approach, we employ a DIC system in our experiments to confirm the post-buckling responses.