Tomasz Wandowski, Paweł Kudela, Paweł Malinowski, Wiesław Ostachowicz,
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10972/109720N/Guided-wave-mode-conversion-phenomenon-in-composite-materials--numerical/10.1117/12.2512682.short
In this paper results of numerical and
experimental analysis of S0/A0 elastic wave mode conversion phenomenon at
various discontinuities in glass fibre reinforced polymer (GFRP) panels are
presented. Analysis of S0/A0 mode conversion effect at Teflon inserts
simulating delamination and impact damage with energies 5 J, 10 J and 15 J is
conducted. In the case of Teflon inserts circular inserts with the same
diameters located at different depth and inserts with various shapes located at
the same depth were investigated. Numerical analysis is based on the time
domain spectral element method (SEM). SEM computational algorithm is adapted
for parallel calculation using graphic processor units (GPUs). Numerical model
takes also into account the influence of material damping. Numerical results
are compared with experimental results based on full wavefield measurements
using scanning laser Doppler vibrometry (SLDV). It is shown that based on the
effects of S0/A0 mode conversion it is possible to detect the damage and determine
its shape and size. In the research, auxiliary Non-Destructive Testing (NDT)
method is also utilised. The aim of its application is to indicate the depth of
discontinuity and to prove that delamination was created in the case of impact
damage. The auxiliary method is based on terahertz spectroscopy (THz) where the
analysis of propagation of electromagnetic waves in the terahertz band is
conducted. The THz spectroscopy is a useful technique for damage assessment in
the dielectric materials.
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