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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Nondestructive evaluation of fused filament fabrication 3D printed structures using optical coherence tomography

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De Pretto, Lucas Ramos [1] ; Amaral, Marcello Magri [2] ; de Freitas, Anderson Zanardi [1] ; Raele, Marcus Paulo [1]
Total Authors: 4
[1] IPEN CNEN SP, Ctr Lasers & Applicat, Nucl & Energy Res Inst, Sao Paulo - Brazil
[2] Univ Brasil, Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: RAPID PROTOTYPING JOURNAL; v. 26, n. 10, p. 1853-1860, NOV 3 2020.
Web of Science Citations: 0

Purpose The quality of components under fused filament fabrication (FFF) is related to the correct filament spacing and bonding of successively deposited layers and is evaluated mainly by scanning electron microscopy (SEM). However, it is a destructive technique and real-time evaluation is not possible. Optical coherence tomography (OCT), on the other hand, is an optical method that acquires cross-sectional images non-invasively and in real-time. Therefore, this paper aims to propose and validate the use of OCT as a non-destructive quality evaluation tool for FFF using Polylactic Acid (PLA) filaments. Design/methodology/approach PLA three-dimensional (3D) printed samples were made in a variety of nozzle temperatures and mesh spacing. These samples were fractured in liquid nitrogen and inspected using SEM (as a gold standard) to evaluate dimensions and morphology, then the samples were evaluated by OCT in the same area, allowing the results confrontation. Findings Our results indicate a good correlation between OCT and SEM for the dimensional assessment of layers. When the filament was extruded in lower temperatures, the OCT images presented sharply defined interfaces between layers, in contrary to higher nozzle temperatures, denoting better fusion between them. However, higher extruding temperatures are incurred in greater deviations from nominal dimensions of the mesh. Finally, we demonstrate the advantage of a full 3D tomographic reconstruction to inspect within a FFF sample, which enabled the inspection of ``hidden{''} information, not visible on a single cross-sectional cut. Originality/value This paper proposes OCT as a novel and nondestructive evaluation tool for FFF. (AU)

FAPESP's process: 17/21851-0 - Development of optical coherence tomography (OCT) imaging and signal analysis methodologies for the evaluation of cutaneous angiogenesis
Grantee:Marcello Magri Amaral
Support Opportunities: Regular Research Grants
FAPESP's process: 15/15775-3 - Optical Coherence Tomography signal autocorrelation analysis algorithm applied to blood flow monitoring in mice with Metabolic Syndrome
Grantee:Lucas Ramos de Pretto
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 19/19465-0 - Development of novel speckle OCT analysis applied to the study of dynamic processes in microfluidic devices and animal models
Grantee:Lucas Ramos de Pretto
Support Opportunities: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 18/20226-7 - Prospecting new antifungal strategies based on light and assisted by functional nanostructures
Grantee:Anderson Zanardi de Freitas
Support Opportunities: Regular Research Grants