Characterizing the Frequency Response of Compliant Materials by Laser Döppler Vibrometry Coupled Acoustic Excitation

Low-stiffness or compliant materials are inherently difficult to characterize in terms of dynamic mechanical properties. Their free-vibration behavior is not frequently analyzed, given that performing classic vibration testing these type may imply the tampering results by external sources, either changes geometry sample, gravity-induced buckling, instrumentation itself (e.g., mass accelerometers). This study proposes an approach determine frequency response types materials, using a noncontact methodology based on acoustic excitation and displacement measurement Laser Döppler Vibrometry. The detailed method be optimized changing sample design into half-cane configuration increase stiffness. significantly increases eigenmodes, facilitating their pressure source. Numerical analysis values Young’s modulus from experimental approaches validates overall procedure. It shown combination numerical proposed possible route for determination inverse engineering.