10.2514/1.J057608">
 

Sustainability study of inherent damping in additively manufactured nickel alloy

Document Type

Article

Publication Date

1-2019

Abstract

The laser powder bed fusion additive manufacturing process has been used to fabricate unique specimens with inherent damping capability for suppressing vibratory responses associated with high cycle fatigue. The innovative concept of the unique specimen is that it is manufactured with internal geometries, densely packed with unfused powder, and during vibration, the powder interaction dissipates energy via friction. Studies of this manufacturing and design approach have demonstrated the capability of suppressing vibration by 10X of a fully fused part. A particle motion mechanism has been identified, and association with vibratory behavior produces a criterion for damping optimization. Despite the accuracy of the criterion, the sustainability (or degradation) of initial/inherent damping performance after subjection to millions of cycles at high strain amplitudes has not been extensively scrutinized. This Paper investigates damping performance sustainment by assessing the endurance, repeatability, and recovery of the inherent damping provided by unfused powder within a uniquely designed specimen. Endurance and repeatability assessments, respectively, identify a limitation in achieving optimal damping and a steady-state damping performance after millions of duty cycles at high strain amplitudes. Though the optimal damping performance recovery attempt is negligible, the inherent damping of the unique specimen after rigorous usage is greater than the results from fully fused parts.

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Source Publication

AIAA Journal (ISSN 0001-1452 | eISSN 1533-385X)

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