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A novel damage index for damage identification using guided waves with application in laminated composites

机译：一种新的损伤指数，用于在复合材料中应用导波识别损伤

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In the current investigation, an innovative time-domain damage index is introduced for the first time which is based on local statistical features of the waveform. This damage index is called the ‘normalized correlation moment’ (NCM) and is composed of the nth moment of the crosscorrelation of the baseline and comparison waves. The performance of this novel damage index is compared for some synthetic signals with that of an existing damage index based on the Pearson correlation coefficient (signal difference coefficient, SDC). The proposed damage index is shown to have significant advantages over the SDC, including sensitivity to the attenuation of the signal and lower sensitivity to the signal’s noise level. Numerical simulations using Abaqus finite element (FE) software show that this novel damage index is not only capable of detecting the delamination type of damage, but also exhibits a good ability in the assessment of this type of damage in laminated composite structures. The NCM damage index is also validated using experimental data for identification of delamination in composites.
机译：在当前的研究中，首次基于波形的局部统计特征首次引入了创新的时域损伤指数。该损伤指数称为“归一化相关矩”（NCM），由基线波和比较波互相关的第n个矩组成。基于Pearson相关系数（信号差系数，SDC），将这种新型损伤指数的性能与某些合成信号的性能与现有损伤指数的性能进行了比较。所提出的损坏指数显示出优于SDC的显着优势，包括对信号衰减的敏感性和对信号噪声水平的较低敏感性。使用Abaqus有限元（FE）软件进行的数值模拟表明，这种新颖的损伤指数不仅能够检测分层的损伤类型，而且在评估层压复合结构中这种类型的损伤方面也显示出良好的能力。还使用实验数据验证了NCM损伤指数，以识别复合材料中的分层。

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