This study investigates the damping behaviour of particle damping integrated into specimens produced via laser beam powder bed fusion (PBF-LB). The specimens, made from AlSi10Mg, contain internal cavities that remain filled with residual powder after manufacturing and dissipate vibrational energy through particle interactions. A systematic experimental investigation is conducted on specimens of varying lengths, cavity positions, and cavity volumes. The influence of relative cavity volume and modal displacement at the cavity location is combined into a single parameter and its direct relationship to the damping effect is demonstrated. Furthermore, the effectiveness of particle damping is shown to be strongly frequency-dependent: maximum effectiveness is observed in the resonance frequency range of 3-4 kHz, while significantly reduced damping occurs at lower frequencies. CT scans reveal that individual outlier specimens with a reduced packing density within the cavity exhibit a comparably high damping effect at lower frequencies but a low damping effect at higher frequencies. The presented metric enables direct comparison of damping behaviour across bending modes and specimen geometries, providing valuable guidelines for the implementation of frequency-tuned particle damping in PBF-LB components.     «

This study investigates the damping behaviour of particle damping integrated into specimens produced via laser beam powder bed fusion (PBF-LB). The specimens, made from AlSi10Mg, contain internal cavities that remain filled with residual powder after manufacturing and dissipate vibrational energy through particle interactions. A systematic experimental investigation is conducted on specimens of varying lengths, cavity positions, and cavity volumes. The influence of relative cavity volume and mod...     »