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Guidance on the Use of Existing ASTM Polymer Testing Standards for ABS Parts Fabricated Using FFF

Journal Article · · Smart and Sustainable Manufacturing Systems
DOI:https://doi.org/10.1520/ssms20190051· OSTI ID:1669703
When evaluating the static mechanical performance of fused filament fabrication (FFF) polymers, researchers have conducted tensile testing using American Society for Testing Materials International (ASTM) D3039 rectangular test specimens and ASTM D638 Type I and Type IV dogbone test specimens. The choice of ASTM D638 versus ASTM D3039 test specimen geometry is usually based on the perceived susceptibility of the ASTM D638 test specimens to failure within the fillet radius. ASTM polymer and plastic tensile test standards define criteria for acceptably tested specimens as requiring failure inside the narrow length (i.e., ASTM D638) or outside of the grips (i.e., ASTM D3039) for the results to be considered acceptable. There has been limited published research regarding the selection of an ASTM test specimen geometry for FFF polymer materials. This study provides evidence-based guidance through the comparison of the mechanical performance and failure acceptance rates of ASTM D3039 and ASTM D638 test specimen geometries, fabricated using FFF acrylonitrile butadiene styrene (ABS). Here, the purpose of the study is to provide guidance on the use of existing ASTM polymer testing standards for additively manufactured polymers. Results indicate there is an inherent benefit to using ASTM D3039 over ASTM D638 Type I and Type IV test specimens for tensile testing. ASTM D3039 test specimens provide the most consistent failure within the test specimen’s gage length, which is attributed to the rectangular design of the test specimen. Results also indicated that, like traditionally manufactured polymer composites, there will be differences in the tensile test results (e.g., ultimate tensile strength, elastic modulus) based on the different cross-sectional areas of the test specimen geometries.
Research Organization:
Howard University, Washington, DC (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003945
OSTI ID:
1669703
Journal Information:
Smart and Sustainable Manufacturing Systems, Journal Name: Smart and Sustainable Manufacturing Systems Journal Issue: 1 Vol. 3; ISSN 2520-6478
Publisher:
ASTM InternationalCopyright Statement
Country of Publication:
United States
Language:
English

References (16)

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Experimental Study of Mechanical Properties of Additively Manufactured ABS Plastic as a Function of Layer Parameters
  • Letcher, Todd; Rankouhi, Behzad; Javadpour, Sina
  • ASME 2015 International Mechanical Engineering Congress and Exposition, Volume 2A: Advanced Manufacturing https://doi.org/10.1115/IMECE2015-52634
conference March 2016

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