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Delamination-induced relative natural frequency change curve and its use for delamination localization in laminated composite beams

机译：分层诱发的相对固有频率变化曲线及其在层合复合梁中分层定位中的应用

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摘要

Delamination is one common type of damage in composite laminates. To avoid structural failure and catastrophic events, detecting delamination is vital. Vibration-based delamination detection methods, which employ changes in structural dynamic properties such as natural frequencies, have been extensively investigated. However, natural frequency is generally considered as a global dynamic property and as such cannot identify local locations of delamination. This study analyzes delamination-induced relative natural frequency change (RNFC) curves in laminated composite beams and finds the relationship between RNFC curves and mode shapes, which can be used for the approximation of RNFC curves. Based on RNFC curves and measured RNFCs, a novel delamination indicator is developed that features the capability of locating delamination simply. Proof of this method is undertaken numerically on a finite element beam model. Its applicability is experimentally validated on glass fiber-reinforced composite beams. Numerical and experimental results show that the method is capable of locating both mid-plane and off-mid-plane delamination in laminated composite beams under different boundary conditions.
机译：分层是复合层压板中一种常见的损坏类型。为了避免结构故障和灾难性事件，检测分层至关重要。已经广泛研究了基于振动的分层检测方法，该方法利用了结构动态属性（例如固有频率）的变化。但是，自然频率通常被认为是全局动态特性，因此无法确定分层的本地位置。这项研究分析了分层复合材料梁中分层引起的相对固有频率变化（RNFC）曲线，并发现RNFC曲线与振型之间的关系，可用于RNFC曲线的近似。基于RNFC曲线和测得的RNFC，开发了一种新颖的分层指示符，该指示器具有简单定位分层的功能。该方法的证明是在有限元梁模型上进行的。它的适用性已在玻璃纤维增​​强复合梁上经过实验验证。数值和实验结果表明，该方法能够在不同边界条件下定位复合材料层合梁的中平面和中平面外分层。

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  • 来源
    《Composite Structures》 |2019年第12期|111501.1-111501.13|共13页
  • 作者

  • 作者单位

    Hohai Univ Dept Engn Mech Nanjing 210098 Jiangsu Peoples R China|Polish Acad Sci Inst Fluid Flow Machinery PL-80231 Gdansk Poland;

    Hohai Univ Dept Engn Mech Nanjing 210098 Jiangsu Peoples R China;

    Polish Acad Sci Inst Fluid Flow Machinery PL-80231 Gdansk Poland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Laminated composite beam; Delamination; Relative natural frequency change; Locating delamination;

    机译：层合复合梁;分层;相对固有频率变化;定位分层;

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