Hybrid Hollow Microlattices With Unique Combination of Stiffness and Damping

Hybrid Hollow Microlattices With Unique Combination of Stiffness and Damping

Hybrid micro-architected materials with unique combinations of high stiffness, high damping, and low density are presented. We demonstrate a scalable manufacturing process to fabricate hollow microlattices with a sandwich wall architecture comprising an elastomeric core and metallic skins. In this configuration, the metallic skins provide stiffness and strength, whereas the elastomeric core pro...

Accurate Stiffness Measurement of Ultralight Hollow Metallic Microlattices by Laser Vibrometry L. Salari-Sharif & L. Valdevit

Recent progress in advanced manufacturing enables fabrication of macro-scale hollow metallic lattices with unit cells in the millimeter range and sub-unit cell features at the submicron scale. If designed to minimize mass, these metallic microlattices can be manufactured with densities lower than 1 mg/cm3, making them the lightest metallic materials ever demonstrated. Measuring the compressive ...

Accurate Stiffness Measurement of Ultralight Hollow Metallic Microlattices by Laser Vibrometry

Recent progress in advanced manufacturing enables fabrication of macro-scale hollow metallic lattices with unit cells in the millimeter range and sub-unit cell features at the submicron scale. If designed to minimize mass, these metallic microlattices can be manufactured with densities lower than 1 mg/cm3, making them the lightest metallic materials ever demonstrated. Measuring the compressive ...

Energy dissipation mechanisms in hollow metallic microlattices

When properly designed at ultra-low density, hollow metallic microlattices can fully recover from compressive strains in excess of 50%, while dissipating a considerable portion of the elastic strain energy. This article investigates the physical mechanisms responsible for energy loss upon compressive cycling, and attributes the most significant contribution to a unique form of structural dampin...

THE MODEL UPDATING OF MASS, DAMPING AND STIFFNESS MATRICES