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An Integrative Experimental Approach to Design Optimization and Removal Strategies of Supporting Structures Used during L-PBF of SS316L Aortic Stents

  • One of the fundamental challenges in L-PBF of filigree geometries, such as aortic stents used in biomedical applications, is the requirement for a robust yet easily removable support structure that allows each component to be successfully fabricated without distortion. To solve this challenge, an integrative experimental approach was attempted in the present study by identifying an optimal support structure design and an optimized support removal strategy for this design. The specimens were manufactured using four different support structure designs based on the geometry exposed to the laser beam during the L-PBF. Support removal procedures included sand blasting (SB), glass bead blasting (GB), and electrochemical polishing (ECP). The two best-performing designs (line and cross) were chosen due to shorter lead times and lower material consumption. As an additional factor that indicates a stable design, the breaking load requirement to remove the support structures was determined. A modified line support with a 145° included angle was shown to be the best support structure design in terms of breaking load, material consumption, and manufacturing time. All three procedures were used to ensure residue-free support removal for this modified line support design, with ECP proving to be the most effective.

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Metadaten
Author:Marius GradORCiD, Naresh Nadammal, Ulrich Schultheiss, Philipp Lulla, Ulf Noster
URN:urn:nbn:de:bvb:898-opus4-25612
DOI:https://doi.org/10.3390/app11199176
Parent Title (English):Applied Sciences
Publisher:MPDL
Document Type:Article
Language:English
Year of first Publication:2021
Publishing Institution:Ostbayerische Technische Hochschule Regensburg
Release Date:2022/02/03
Volume:11
Issue:19
Article Number:9176
First Page:1
Last Page:22
Note:
Corresponding author: Marius Grad
Institutes:Fakultät Maschinenbau
Technologie-Campus Parsberg-Lupburg
Fakultät Maschinenbau / Labor Werkstoffrandschichtanalytik
Begutachtungsstatus:peer-reviewed
OpenAccess Publikationsweg:Gold Open Access- Erstveröffentlichung in einem/als Open-Access-Medium
Corresponding author der OTH Regensburg
research focus:Lebenswissenschaften und Ethik
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International