A parametric study of guided mechanical wave propagation in laminated safety glass (windshields) is presented.
Laminated safety glass is considered a three layered structure modeled as a viscoelastic layer bonded by two elastic
layers, i.e., glass plates. The interface between each of the two bonded layers is modeled as a bed of longitudinal and
shear linear springs. The spring constants are estimated using surface analysis in conjunction with atomic force
microscopy and profilometer analysis. Attenuation due to material absorption of the viscoelastic interlayer is considered
while calculating the dispersion curves for the system. The dependence of phase and energy velocities, attenuation, and
resonance frequencies, upon variations of material properties (e.g., modulus of elasticity, Poisson's ratio, and
longitudinal and shear ultrasonic material attenuation) is discussed. The relative physical dimensions (i.e., layer
thickness variation of each layer) influence upon guided wave behavior is also presented and discussed. Results are
applicable to any similar three-layer laminated structure.