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Tensile Properties of Inkjet 3D Printed Parts: Critical Process Parameters and Their Efficient Analysis

Mueller, Jochen and Kim, Shi En and Shea, Kristina and Daraio, Chiara (2015) Tensile Properties of Inkjet 3D Printed Parts: Critical Process Parameters and Their Efficient Analysis. In: 35th Computers and Information in Engineering Conference. Vol.1A. American Society of Mechanical Engineers , New York, NY, Art. No. V01AT02A040. ISBN 978-0-7918-5704-5.

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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.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Mueller, Jochen0000-0002-4808-2223
Shea, Kristina0000-0003-3921-2214
Daraio, Chiara0000-0001-5296-4440
Additional Information:© 2015 ASME. This research is supported by the ETH Zurich, Seed Project SPMaP 02-14, ”Additive Manufacturing of Complex-Shaped Parts with Locally Tunable Materials”.
Funding AgencyGrant Number
ETH ZurichSP-MaP 02-14
Subject Keywords:Tensile strength, Printing, Storage, Mechanical properties, Design, Nozzles, Experimental design, Additive manufacturing, Testing, Flow (Dynamics)
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Other Numbering System NameOther Numbering System ID
ASME PaperDETC2015-48024
Record Number:CaltechAUTHORS:20160812-075217608
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69581
Deposited By: Ruth Sustaita
Deposited On:12 Aug 2016 16:31
Last Modified:17 Nov 2020 00:53

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