DELAMINATION DETECTION IN THIN-WALLED COMPOSITE STRUCTURES USING ACOUSTIC PITCH-CATCH TECHNIQUE WITH FIBER BRAGG GRATING SENSORS

Authors

  • Z. M. Hafizi Advanced Structural Integrity and Vibration Research (ASIVR), Faculty of Mechanical & Automotive Engineering Technology, Universiti Malaysia Pahang (UMP), 26600 Pekan, Pahang, Malaysia
  • I. N. Ibrahim Advanced Structural Integrity and Vibration Research (ASIVR), Faculty of Mechanical & Automotive Engineering Technology, Universiti Malaysia Pahang (UMP), 26600 Pekan, Pahang, Malaysia
  • E. Vorathin Department of Mechanical Engineering, Universiti Teknologi PETRONAS, 32610 Bandar Seri Iskandar, Perak, Malaysia https://orcid.org/0000-0003-1872-2784

DOI:

https://doi.org/10.11113/jurnalteknologi.v85.18681

Keywords:

Fiber Bragg grating (FBG), thin-walled composite structures, acoustic waves, delamination, structural health monitoring (SHM)

Abstract

Structural health monitoring (SHM) of a composite structure is essential in maintaining the integrity of the structure. Over the years, various studies have reported on the use of conventional electrical sensors in analysing acoustic wave propagation for delamination detection. However, electrical sensors are associated with drawbacks such as high signal attenuation, are prone to electromagnetic interference (EMI) and are not suitable for harsh environments. Therefore, this paper reported on the use of fiber Bragg grating (FBG) sensors for delamination detection. Two composite structures with delamination sizes of 10 cm × 2 cm and 10 cm × 6 cm were fabricated. Two FBGs were bonded before and after the delamination. In addition, three trials of impacts were induced at the centre of the structure. Multiple signal parameters were obtained and analysed, which were the time delay, amplitude difference and velocity difference. The experimental results revealed that the time delay, amplitude and velocity analysis varied for both the delamination sizes with an average percentage of 42.36%, 97.09% and 42.39%, respectively. Therefore, it was confirmed that the increase in delamination size resulted in a longer time delay, higher signal amplitude attenuation and slower wave propagation.          

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Published

2023-04-19

Issue

Section

Science and Engineering

How to Cite

DELAMINATION DETECTION IN THIN-WALLED COMPOSITE STRUCTURES USING ACOUSTIC PITCH-CATCH TECHNIQUE WITH FIBER BRAGG GRATING SENSORS. (2023). Jurnal Teknologi, 85(3), 35-42. https://doi.org/10.11113/jurnalteknologi.v85.18681