层合梁分层界面非线性振声模型与定位方法  

Nonlinear Interface Vibro-Acoustic Model and Localization Method for Delamination in Laminated Beams

作　　者：杨宇宸 李秋实 季敏聪 邱玲[1] YANG Yuchen;LI Qiushi;JI Mincong;QIU Ling(College of Mechanics and Engineering Science,Hohai University,Nanjing 211100,Jiangsu,China;CRRC Qihang New Energy Technology Corporation Limited,Beijing 100089,China)

机构地区：[1]河海大学力学与工程科学学院,江苏南京211100 [2]中车启航新能源技术有限公司,北京100089

出　　处：《力学季刊》2025年第1期28-38,共11页Chinese Quarterly of Mechanics

基　　金：江苏省自然科学基金(BK20230947);河海大学大学生创新创业训练计划(2024102941286)。

摘　　要：层合梁由于其增强刚度和强度的特性,被广泛应用于工程结构中.然而,分层作为一种不可见损伤常出现于层合梁制造与服役过程中.因此,精确定位层合梁分层对于保障结构完整性至关重要.尽管现有线性界面振动模型可表征为由张开型分层引发的分层区域线性界面力缺失,却无法刻画振声激励下呼吸型分层的张开-闭合接触行为.针对此问题,本研究提出了一种新型界面非线性振声模型,将界面力作为多频谐波激励源分布于分层界面,从而产生边带谐波.在此模型基础上,本文着重研究了利用非线性界面力局部化的特征进行分层定位的方法,通过其非线性工作变形构造非线性界面力,并由频域多个相邻边带处界面力构造非线性损伤指标.本研究通过非接触激光扫描量测获取层合梁工作变形,对所提出的分层定位方法进行实验验证.结果表明,该方法可准确识别层合梁分层损伤,并且精确刻画其位置与尺寸.Laminated beams are widely used in engineering structures due to their enhanced strength and stiffness.However,delamination,a barely visible form of damage,can occur during manufacturing or service.Accurate localization of delamination in laminated beams is essential for maintaining structural integrity.While the existing linear interface vibration model has been proposed to represent the absence of linear interface forces in the debonding region of open delamination,it fails to capture the opening-closing contact behavior of"breathing"debonding under nonlinear vibro-acoustic excitation.To address this problem,this study proposes a new nonlinear interface vibro-acoustic model,in which the nonlinear interface forces appear exclusively in the"breathing"debonding region,acting as multi-tone harmonic excitation sources to produce sideband harmonics.Moreover,this study emphasizes the use of nonlinear interface forces for the localization of delamination due to this inherent merit of localization.The nonlinear interface forces are reconstructed from nonlinear operating deflection shapes of a laminated beam.Nonlinear damage indices are established relying on nonlinear interfaces associated with multiple neighbouring sideband harmonics.The capability of the approach for localizing"breathing"debonding in laminated beams is experimentally validated through non-contact measurements using a scanning laser vibrometer.The results demonstrate that the approach is capable of predicting the occurrence of delaminations in laminated beams and accurately identifying their locations and sizes.

关 键 词：分层 界面非线性振声模型 非线性谐波 分层定位 激光量测 

分 类 号：TU125[建筑科学—建筑理论] TU126TU311.3