Numerical and experimental investigation of delaminations in a unidirectional composite plate using NDT and SHM techniques
Numerical and experimental investigation of delaminations in a unidirectional composite plate using NDT and SHM techniques
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使用NDT和SHM技术对单向复合板分层进行数值和实验研究
DOI：
10.1177/1045389x20978294
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
V. Giurgiutiu
中科院分区：
文献类型：
--
作者：
Asaad Migot;Hanfei Mei;V. Giurgiutiu
本文采用无损检测、结构健康监测和激光多普勒测振仪对单向复合材料板不同深度的三种模拟脱层进行了定量分析。首先，充分使用RollerFORM和Omniscan设备来识别分层。其次，结合导波，开发的成像方法被成功地用于检测和量化感兴趣的分层。调谐曲线由实验确定，以定义入射波的主兰姆波模式。第三，利用多物理场三维有限元方法模拟了含脱层兰姆波的传播和相互作用，提取了用于波数分析的波场数据。实验部分采用SLDV对数值计算结果进行了验证。通过数值模拟和实验研究了脱层深度对脱层区域产生的陷波的影响。结果表明，脱层深度对陷波有一定的影响。数值计算和实验结果表明，近表面脱层在脱层区域有较强的陷波，而远表面脱层有较弱的陷波。能量分布图的数值和实验波场数据充分量化感兴趣的脱层。数值计算结果与实验结果吻合较好。
In this paper, the non-destructive testing (NDT), structural health monitoring (SHM), and scanning laser Doppler vibrometer (SLDV) techniques were presented to quantify three simulated delaminations inserted at different depths of a unidirectional composite plate. First, the RollerFORM and Omniscan equipment were sufficiently used to identify the delaminations. Second, in conjunction with guided waves, the developed imaging method was successfully used to detect and quantify the interested delaminations. The tuning curves were determined experimentally to define the dominant Lamb wave modes of incident waves. Third, multi-physics three-dimensional finite element simulations of propagating and interacting Lamb waves with delaminations were implemented to extract the wavefield data for wavenumber analysis. The experimental part was conducted to validate the numerical results using SLDV. The effect of the delamination depth on the trapped waves generated over the delamination region was studied numerically and experimentally. The results showed that trapped waves could be affected by the delamination depth. Both numerical and experimental results demonstrated that the near surface delamination has strong trapped waves over the delamination region while the far surface delamination has weak trapped waves. The energy distribution maps of numerical and experimental wavefields data sufficiently quantified the interested delaminations. A good agreement was achieved between the numerical and experimental results.