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A novel damage characterization approach for laminated composites in the absence of material and structural information

机译：一种新型损伤表征在没有材料和结构信息中的层压复合材料

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摘要

Laminated composites have been increasingly used in structural components. However, transverse impact to a composite laminate can cause initial damage such as notches and delamination, jeopardizing the integrity and safety of composite laminated structures. With this concern, this study proposes a novel damage characterization approach for the identification of initial damage in composite laminates, even in the absence of material and structural information. In particular, starting from the vibration equation of composite laminates, a novel concept of damage-caused force is formulated to characterize damage, and strategies of isotropization and normalization are further integrated to deal with the absence of material and structural information. Thereby, a baseline-free damage index is established using the damage-caused force, by which the presence, location, and size of initial damage in cross-ply composite laminates can be characterized without knowledge of material and structural parameters. The capability of the approach is numerically verified on carbon fiber-reinforced polymer (CFRP) laminates with a notch and a delamination, respectively. The applicability of the approach is experimentally validated by identifying a notch and a delamination in CFRP laminates, respectively. The CFRP laminates are excited by lead-zirconate-titanate (PZT) actuators and scanned by a scanning laser vibrometer (SLV) to acquire high-resolution mode shapes. Numerical and experimental results show that the proposed approach features high robustness to environmental noise and is capable of identifying initial damage in cross-ply composite laminates without prior material and structural information.
机译：层压复合材料越来越多地用于结构部件。然而，对复合层压材料的横向冲击可引起缺口和分层的初始损伤，危及复合层叠结构的完整性和安全性。通过这种担忧，这项研究提出了一种新的损伤表征方法，用于识别复合层压材料中的初始损伤，即使在没有材料和结构信息的情况下也是如此。特别地，从复合层压板的振动方程开始，将损伤的损伤力的新概念配制成表征损伤，并且各等调化和标准化的策略进一步纳入缺乏材料和结构信息。因此，使用损坏的力建立基线损伤指数，通过该力，通过该损坏的初始损伤的初始损伤的初始损伤的初始损坏的尺寸可以表征，而不知道材料和结构参数。该方法的能力分别在具有凹口和分层的碳纤维增强聚合物（CFRP）层压板上进行数值验证。通过鉴定CFRP层压板中的凹口和分层，通过确定该方法的适用性进行实验验证。 CFRP层压板通过铅锆钛酸盐（PZT）致动器激发并通过扫描激光振动器（SLV）扫描以获得高分辨率模式形状。数值和实验结果表明，该方法具有对环境噪声的高稳健性，并且能够在没有先前材料和结构信息的情况下识别交叉层复合层压板中的初始损坏。

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  • 来源
    《Mechanical systems and signal processing》 |2020年第9期|106831.1-106831.19|共19页
  • 作者

    Maosen Cao; Zhongqing Su; Hao Xu; Maciej Radzienski; Wei Xu; Wieslaw Ostachowicz;

  • 作者单位

    Jiangxi Provincial Key Laboratory of Environmental Geotechnical Engineering and Disaster Control Jiangxi University of Science and Technology Ganzhou 341000 People's Republic of China Department of Engineering Mechanics Hohai University Nanjing 210098 People's Republic of China;

    Department of Mechanical Engineering The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong People's Republic of China;

    School of Aeronautics and Astronautics Faculty of Vehicle Engineering and Mechanics State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 People's Republic of China;

    Institute of Fluid-Flow Machinery Polish Academy of Sciences Gdansk 80-231 Poland;

    Jiangxi Provincial Key Laboratory of Environmental Geotechnical Engineering and Disaster Control Jiangxi University of Science and Technology Ganzhou 341000 People's Republic of China Department of Mechanical Engineering The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong People's Republic of China Department of Engineering Mechanics Hohai University Nanjing 210098 People's Republic of China;

    Institute of Fluid-Flow Machinery Polish Academy of Sciences Gdansk 80-231 Poland;

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  • 正文语种 eng
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  • 关键词

    Composite laminate; Initial damage identification; Mode shape; Damage-caused force; Damage index; Laser scanning measurement;

    机译：复合层压板;初始损害识别;模式形状;损坏的力量;损伤指数;激光扫描测量;

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