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Title: Detection and quantification of fibre waviness in composite laminates using ultrasonic arrays
Author: Pain, Damien
ISNI:       0000 0004 5365 1165
Awarding Body: University of Bristol
Current Institution: University of Bristol
Date of Award: 2014
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The work presented in this thesis shows that progress has been made in the inspection of composite materials and a methodology to improve imaging and detection of subtle defects such as waviness has been established. In 2D modelling of the Point Spread Function (PSF) is used to assess the p81'formance of various imaging algorithms. It is shown that for isotropic materials the directivity function removes the side lobes. For anisotropic materials, the simulations have shown that the size of the PSF is minimised with the addition of a velocity correction. The main factors influencing the ultrasonic wave propagation in composites material have been described experimentally and corrected for in new imaging algorithms. The experiments on carbon fibre composites have shown that by applying these corrections, side-drilled-holes (SDHs) at depths of 4mm, 10mm and 16mm can be clearly imaged with the SNR improved by 7dB, 16dB and 14 dB respectively.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available