To design and optimize for capabilities of additive manufacturing processes it is also necessary to understand and model their variations in geometric and mechanical properties. In this paper, such variations of inkjet 3D printed parts are systematically investigated by analyzing parameters of the whole process, i.e. storage of the material, printing, testing, and storage of finished parts. The goal is to both understand the process and determine the parameters that lead to the best mechanical properties and the most accurate geometric properties. Using models based on this understanding, we can design and optimize parts, and fabricate and test them successfully, thus closing the loop. Since AM materials change rapidly and this process will have to be repeated, it is shown how to create a cost and time efficient experimental design with the one-factor-at-a-time and design of experiments methods, yielding high statistical accuracies for both main and interaction effects. The results show that the number of intersections between layers and nozzles along the load-direction has the strongest impact on the mechanical properties followed by the UV exposure time, which is investigated by part spacing, the position on the printing table and the expiry date of the material. Minor effects are found for the storage time and the surface roughness is not affected by any factor. Nozzle blockage, which leads to a smaller flow-rate of printing material, significantly affected the width and waviness of the printed product. Furthermore, the machine’s warm-up time is found to be an important factor.
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ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
August 2–5, 2015
Boston, Massachusetts, USA
Conference Sponsors:
- Design Engineering Division
- Computers and Information in Engineering Division
ISBN:
978-0-7918-5704-5
PROCEEDINGS PAPER
Tensile Properties of Inkjet 3D Printed Parts: Critical Process Parameters and Their Efficient Analysis
Jochen Mueller
,
Jochen Mueller
ETH Zurich, Zurich, Switzerland
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Shi En Kim
,
Shi En Kim
California Institute of Technology, Pasadena, CA
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Kristina Shea
,
Kristina Shea
ETH Zurich, Zurich, Switzerland
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Chiara Daraio
Chiara Daraio
ETH Zurich, Zurich, Switzerland
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Jochen Mueller
ETH Zurich, Zurich, Switzerland
Shi En Kim
California Institute of Technology, Pasadena, CA
Kristina Shea
ETH Zurich, Zurich, Switzerland
Chiara Daraio
ETH Zurich, Zurich, Switzerland
Paper No:
DETC2015-48024, V01AT02A040; 10 pages
Published Online:
January 19, 2016
Citation
Mueller, J, Kim, SE, Shea, K, & Daraio, C. "Tensile Properties of Inkjet 3D Printed Parts: Critical Process Parameters and Their Efficient Analysis." Proceedings of the ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. Volume 1A: 35th Computers and Information in Engineering Conference. Boston, Massachusetts, USA. August 2–5, 2015. V01AT02A040. ASME. https://doi.org/10.1115/DETC2015-48024
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