Abstract
This study investigates the impact of metal volume fraction (MVF) on the propagation of guided ultrasonic waves (GUW) in fiber metal laminates (FML). GUW interactions with various metal and prepreg layers are influenced by changes in the FML composition. A crucial parameter for FML characterization is the metal volume fraction (MVF), representing the volume of metal to prepreg. This research assumes that variations in MVF affect GUW propagation in FMLs. The study analyzes the influence of MVF on GUW propagation in FML, specifically comparing GUW propagation in GLARE plates with nearly identical geometry but different MVF and layer structures. Initially, simulations were conducted to predict expected changes in dispersion properties. To validate these predictions, pitch-catch measurements were performed on the panels, measuring three transducer paths for each panel to enhance measurement significance. An intensive study of wave modes was undertaken to investigate the influence of MVF on mode velocities. The simulation results were validated through experiments, highlighting the significant impact of MVF on GUW propagation in FML. Interestingly, in FMLs with varying MVFs and layer structures, the structural conditions of the layers (such as fiber orientation) demonstrated a non-negligible influence on GUW propagation, surpassing the influence of MVF alone.
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