Damping Capacity of Different Viscoelastic Lattice structures: Influence of Relative Density and Prestrain

This thesis investigates the dynamic behavior of viscoelastic lattice structures through both numerical simulations and experimental analysis. Lattice structures are lightweight, architected materials with high strength and tunable damping capabilities, especially when combined with viscoelastic polymers. Due to the frequency-dependent stiffness and damping of these materials, predicting resonance behavior is complex and requires advanced modeling. The study begins with a benchmark case of a viscoelastic beam, followed by a comparative analysis of three lattice geometries at different relative densities. Harmonic response simulations are performed and validated against vibrometer measurements on 3D-printed samples. The influence of pre-deformation on damping behavior is also examined through compression tests and a dedicated experimental setup using a lattice sandwich structure. Results highlight how geometry, material, and prestress conditions jointly influence vibrational performance.