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Functionally oriented fabric (FOF) is a woven textile with irregularly distributed secondary material strips in both warp and weft directions. Strips form a pattern and locally improve mechanical properties of a laminate, especially around an opening. Major material is low-cost fiber roving and minor material is a high mechanical property roving, such as carbon fiber. The subject of this work is to analyze the effect of different FOF laminate layups on natural frequencies of the laminate with a notch. The layups are “0/90”, “0/30/60” and “0/45” as the most used configurations for quasi-isotropic laminate structure. The width of strip is 20 mm, span of strips is 20 mm and there is a 20 mm notch in the center of the plate. Modal analysis has been made on laminates with 6 laminae through thickness so the influence of geometry variation can be neglected. The benefit of a functionally oriented fabric structure is in increased natural frequency for twisting (1st and 3rd) and bending (2nd and 4th) modes in comparison with pure glass laminate. The increase in frequency in 1st mode is -3% for [0°/90°2]s layup, 12.9% for [0°/30°/60°]s layup and 30.3% for [0°/45°2]s layup; increase in 2nd mode is 27.7% for [0°/90°2]s layup, 29.8% for [0°/30°/60°]s layup and 43.7% for [0°/45°2]s layup; increase in 3rd mode is 3.9% for [0°/90°2]s layup, 9.6% for [0°/30°/60°]s layup and 26.7% for [0°/45°2]s layup; and increase in 4th mode is 22.6% for [0°/90°2]s layup, 25.3% for [0°/30°/60°]s layup and 37.6% for [0°/45°2]s layup. These enhancements help to prevent resonance in standard operating frequencies of mechanisms and machines, thus extending their operational lifespan. Additionally, the strategic placement of functional material strips around structural openings provides increased stiffness without the need for extra layers, effectively reducing the laminate’s overall mass. This study highlights the potential of FOF to improve the dynamic performance and lifespan of laminated composite structures used in various engineering applications.

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Modal Analysis of Functionally Oriented Fabric Laminate with 20 mm Wide Carbon Strips and a 20 mm Notch

  • 会议论文

  • 发表日期：

    2026年

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  • Radek Zbončák

摘要

Functionally oriented fabric (FOF) is a woven textile with irregularly distributed secondary material strips in both warp and weft directions. Strips form a pattern and locally improve mechanical properties of a laminate, especially around an opening. Major material is low-cost fiber roving and minor material is a high mechanical property roving, such as carbon fiber. The subject of this work is to analyze the effect of different FOF laminate layups on natural frequencies of the laminate with a notch. The layups are “0/90”, “0/30/60” and “0/45” as the most used configurations for quasi-isotropic laminate structure. The width of strip is 20 mm, span of strips is 20 mm and there is a 20 mm notch in the center of the plate. Modal analysis has been made on laminates with 6 laminae through thickness so the influence of geometry variation can be neglected. The benefit of a functionally oriented fabric structure is in increased natural frequency for twisting (1st and 3rd) and bending (2nd and 4th) modes in comparison with pure glass laminate. The increase in frequency in 1st mode is -3% for [0°/90°2]s layup, 12.9% for [0°/30°/60°]s layup and 30.3% for [0°/45°2]s layup; increase in 2nd mode is 27.7% for [0°/90°2]s layup, 29.8% for [0°/30°/60°]s layup and 43.7% for [0°/45°2]s layup; increase in 3rd mode is 3.9% for [0°/90°2]s layup, 9.6% for [0°/30°/60°]s layup and 26.7% for [0°/45°2]s layup; and increase in 4th mode is 22.6% for [0°/90°2]s layup, 25.3% for [0°/30°/60°]s layup and 37.6% for [0°/45°2]s layup. These enhancements help to prevent resonance in standard operating frequencies of mechanisms and machines, thus extending their operational lifespan. Additionally, the strategic placement of functional material strips around structural openings provides increased stiffness without the need for extra layers, effectively reducing the laminate’s overall mass. This study highlights the potential of FOF to improve the dynamic performance and lifespan of laminated composite structures used in various engineering applications.