A parametric study of guided mechanical waves in windshields: a three-layer laminated structure

摘要

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.