Stress shielding effect in pressure-assisted binder jetting

Levi Kirby; Fan Fei; Xuan Song

doi:10.1016/j.powtec.2022.118146

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Stress shielding effect in pressure-assisted binder jetting

Journal article

Peer reviewed

Stress shielding effect in pressure-assisted binder jetting

Levi Kirby, Fan Fei and Xuan Song

Powder technology, Vol.415, p.118146

02/2023

DOI: 10.1016/j.powtec.2022.118146

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Abstract

A key challenge in binder jet additive manufacturing is the low density of fabricated parts. An emerging approach to mitigate the low density is comprised of in-situ uniaxial compression of the print. However, the applied pressure prompts a heterogeneous stress network between the ink-saturated print and the surrounding loose powder, i.e., stress shielding. In this work, we aim to investigate the effects of printing parameters on inducing stress shielding during compaction of a selectively inkjetted powder bed. We find that when compacted with dry powders, saturated powders experienced significantly reduced stresses. The size of print area occupied by the ink-saturated powder played a major role as a decreasing print area led to a more significant disparity in stress between the two regions. Lastly, a higher ink concentration within the print led to a more notable stress shielding effect in the printed region. [Display omitted] •Saturated powders experienced reduced stresses when co-compacted with dry ones.•A smaller print area leads to a more significant disparity in stress in powder bed.•A higher ink concentration leads to a more notable stress shielding effect.•Compaction properties of different regions influence the stress shielding effect.

Binder jetting

Internal stress

Particle packing

Powder processing

Stress shielding

Details

Title: Subtitle: Stress shielding effect in pressure-assisted binder jetting
Creators: Levi Kirby
Fan Fei
Xuan Song
Resource Type: Journal article
Publication Details: Powder technology, Vol.415, p.118146
DOI: 10.1016/j.powtec.2022.118146
ISSN: 0032-5910
eISSN: 1873-328X
Publisher: Elsevier B.V
Grant note: DOI: 10.13039/100000181, name: Air Force Office of Scientific Research, award: FA9550-20-1-0700
Language: English
Date published: 02/2023
Academic Unit: Industrial and Systems Engineering; Injury Prevention Research Center
Record Identifier: 9984333159802771

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