Determining unfused powder threshold for optimal inherent damping with additive manufacturing

Scott‐Emuakpor, Onome; Beck, Jeff; Runyon, Brian; George, Tommy

doi:10.1016/j.addma.2020.101739

Cited by 14 publications

(9 citation statements)

References 21 publications

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“…One possibility to increase the damping in laser beam melted structural components is to integrate the effect of particle damping [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. By means of particle dampers, produced by laser powder bed fusion (LPBF), vibrations can be reduced by more than a factor of 20 in some cases [7,10,12].…”

Section: Reviewmentioning

confidence: 99%

“…Scott-Emuakpor et al analysed forced vibrations of particle-damped beams manufactured of Inconel 718 [12,13,19,20,34,35] and AISI 316L stainless steel [14,35]. The influence of the cavity position and number for a clamped beam are investigated.…”

Section: Applications and Research Activitiesmentioning

confidence: 99%

“…Furthermore, it is not practicable to investigate more than 20 influencing parameters in one study, as the experimental or simulation effort would be excessive [7,21]. The derivation of design recommendations is also difficult when local maxima and minima occur in the curves of the damping [7,14]. For this reason, the focus is often placed on the influencing parameters that seem to have the greatest influence on the damping.…”

Section: Design Parametermentioning

confidence: 99%

“…In the field of additive manufacturing, especially in powder bed-based processes, the effect of particle damping represents a hitherto little-researched but very effective method for reducing vibrations [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Particle dampers produced by laser powder bed fusion (LPBF) can reduce vibrations by more than a factor of 20 in a wide frequency range [7,10,12].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, modelling is challenging due to highly non-linear properties [21][22][23]. Initial approaches to describing the effect of particle damping focus on limited parameter studies on additively manufactured primitives [7,9,10,[12][13][14]16,17]. Isolated demonstrators such as cutting tool holders, braking discs or motorcycle triple clamps have also been considered [8,16,18].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Design of Particle Dampers for Laser Powder Bed Fusion

Ehlers

Lachmayer

2022

Applied Sciences

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Additively manufactured particle dampers can significantly improve component damping. However, if designed incorrectly, the damping can be worsened. For the design of additively manufactured particle dampers, there are not yet sufficient design rules and models to describe the effect due to numerous design parameters. The research question answered in this paper describes how the effect of particle damping can be characterised as a function of excitation force and excitation frequency for different cavity sizes. To characterise the effect of particle damping, a 33 full factorial test plan is constructed, and the damping is determined experimentally. It is shown that the damping can be reliably evaluated with the circle-fit method. The effect of particle damping is investigated for beams made of AlSi10Mg, 1.2709 and Ti6Al4V. As a result, a positive effect of the particle damping in a frequency range from 500 to 30,000 Hz and partly up to the 9th bending mode can be proven. It is shown that, for the first bending mode, there is an optimum at approx. 2000 Hz. For the optimum, the increase of the damping for the tool steel 1.2709 to 28 and for the aluminium alloy AlSi10Mg to 18 can be proven.

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Section: Reviewmentioning

confidence: 99%

Section: Applications and Research Activitiesmentioning

confidence: 99%

Section: Design Parametermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Design of Particle Dampers for Laser Powder Bed Fusion

Ehlers

Lachmayer

2022

Applied Sciences

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Sound Characteristics and Mechanical Properties of Metal Powder Chamber Structures Composite Materials Formed by Laser Powder Bed Fusion

Li,

Guo,

Jiang

et al. 2024

Adv Eng Mater

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Granular damping technology is a widely used method in aerospace and other industries to reduce vibration and noise. However, the technique still faces challenges such as secondary processing, additional structure, single structure, and residual stress. This article introduces a new composite material, the Metal Powder Chamber Structure (MPCS), formed through the laser powder bed fusion (LPBF) technology. The article explores the effects of factors like arrangement mode, volume fraction, and powder chamber diameter on the sound and mechanical properties of MPCS. The study shows that MPCS improves the sound insulation effect of the material and defies the mass law of sound insulation. The sample 4B40 using a body‐centered cubic arrangement has a sound insulation coefficient of 52dB. The sound absorption efficiency curve presents a double peak, and the sample 6F60 exhibits the highest sound absorption efficiency of 0.76. MPCS changes the deformation stage of the material stress‐strain curve, and different MPCS also alters the compression deformation mode of the composite material. By studying the effects of MPCS on sound and mechanical properties, we hope to provide a better and more sustainable solution for vibration and noise reduction.This article is protected by copyright. All rights reserved.

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