COMPOSITES SCIENCE AND ENGINEERING ›› 2026, Vol. 0 ›› Issue (7): 93-99.DOI: 10.19936/j.cnki.2096-8000.20260728.011

• DESIGN AND TECHNIQUE • Previous Articles     Next Articles

Defect identification of plastic liner and carbon fiber layer of hydrogen storage cylinder based on microwave characteristics

GUO Kai1, BIAN Zhaopei1, LING Xiao1*, NIU Jiang2, YAO Yongchuang2   

  1. 1. School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
    2. Gansu Province Special Equipment Inspection and Testing Institute, Lanzhou 730050, China
  • Received:2025-07-16 Revised:2025-08-22 Accepted:2025-08-25 Online:2026-07-28 Published:2026-08-06

Abstract: To realize the non-destructive detection of plastic liners and carbon fiber layers, microwave detection technology was used to conduct experimental research on prefabricated defective plastic sheets and carbon fiber samples. Firstly, carbon fiber samples with fourlayupangles were designed, and the plastic sheets and carbon fiber specimens were processed for defects. Then, the sample was tested by the microwave inspection system, and the defect evaluation and characterization were completed in combination with the detection data. The results show that the transmission parameter (S21) has the best stability and the highest fitting degree at 0° layup angles, and the microwave signal is the least interfered with, which is the most conducive to defect detection. In addition, defects can significantly change the microwave transmission, and different types of defects show unique changes in the S-parameters, which can be used for defect identification. This study provides a parameter optimization basis and a new approach for defect identification for the microwave non-destructive testing of hydrogen storage cylinder composite structures.

Key words: microwave non-destructive testing, hydrogen storage cylinders, carbon fiber, plastic liner, defect

CLC Number: