Terahertz Spectroscopic Characterization and Thickness Evaluation of Internal Delamination Defects in GFRP Composites
نویسندگان
چکیده
Abstract The use of terahertz time-domain spectroscopy (THz-TDS) for the nondestructive testing and evaluation (NDT&E) materials structural systems has attracted significant attention over past two decades due to its superior spatial resolution capabilities detecting characterizing defects damage in non-conducting materials. In this study, THz-TDS system is used detect, localize evaluate hidden multi-delamination (i.e., a three-level system) multilayered GFRP composite laminates. To obtain accurate results, wavelet shrinkage de-noising algorithm remove noise from measured time-of-flight (TOF) signals. thickness location each delamination defect z -direction through-the-thickness direction) are calculated de-noised TOF signals considering interaction between pulsed THz waves different interfaces A comparison actual values before after denoising process indicates that latter provides better results with less than 3.712% relative error, while error non-de-noised reaches 16.388%. Also, power absorbance levels at every interface refractive indices laminates evaluated based on analytical experimental approaches. present study an adequate theoretical analysis could help NDT&E specialists estimate maximum and/or structures can be by THz-TDS. accuracy obtained highlights
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ژورنال
عنوان ژورنال: Chinese journal of mechanical engineering
سال: 2023
ISSN: ['1000-9345', '2192-8258']
DOI: https://doi.org/10.1186/s10033-022-00829-7