Abstract
Simply-supported beams with self-sealing powder were fabricated via Laser Powder Bed Fusion technology. Systematic investigation of the effects of powder filling quantity and acceleration excitation on the system’s dynamic behavior was conducted through shaker-based sweep frequency experiments and multiphase flow theory simulations. The research reveals a dual-threshold effect governing powder filling quantity: when the quantity exceeds the first threshold, significant damping enhancement occurs alongside rapid attenuation of the resonance peak amplitude; beyond the second threshold, however, damping saturation induced by the powder emerges while structural stiffness attenuation dominates the system response, consequently leading to a rebound in peak acceleration. Furthermore, an optimal operating range exists for input acceleration intensity, as excessive excitation promotes collective motion of the powder mass, thereby diminishing friction-induced damping between particles. Finally, vibration responses of the self-sealing powder damping beams were simulated and predicted using a particle damping model based on gas-particle multiphase flow theory. Collectively, these findings establish a theoretical foundation and provide critical technical guidelines for designing integrated damping structures through additive manufacturing.
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