May 24, 2019
ASTM International鈥檚 committee on additive manufacturing technologies () is developing a standard-guide for mechanical testing of additively manufactured plastics (). The guide aims to incorporate what has been learned about mechanical testing modification, interpreting results, and validating test methods with respect to additively manufactured polymer parts.
The standard is a project of ASTM International鈥檚 Additive Manufacturing Center of Excellence, led by 萝莉社 University鈥檚 National Institute for Aviation Research (NIAR), launched last year to accelerate R&D, standardization, and innovation in additive manufacturing.
Within 萝莉社-NIAR, the National Center for Advanced Materials Performance (NCAMP) is developing material property data and statistical analysis reports for additively manufactured materials based on input from industry steering committees and government review boards.
Based on lessons learned through the first additive qualification program under the NCAMP process (ULTEM 9085), NIAR is conducting a round-robin study to better understand alternative methods and geometries that more appropriately characterize additively produced specimens. The study aims to drive consensus across multiple ASTM committees (F42 & D20) and offer universally-acceptable guidance for the AM industry.
鈥淣IAR has the experience necessary to leverage material qualification efforts into applicable industry standardsfor adjacent material and technology systems, such as additive manufacturing,鈥� said John Tomblin, NIAR executive director. 鈥淭he round-robin study is the next step in expanding on the work accomplished by the qualification program.鈥�
Partners like ASTM international member Chul Y. Park, an associate technical fellow at Boeing, notes that during Boeing鈥檚 internal efforts to develop , his team found that approaches that had worked well for traditional materials and subtractive manufacturing methods may not be optimal for additive.
鈥淏oeing has a long history of working with industry stakeholders in multiple standards development organizations, as we believe in sharing common knowledge through industry standards,鈥� says Park. 鈥淎s for the mechanical test methods for polymer-based AM, we coordinated with various standards development organization stakeholders, including ASTM International, to share the issues and Boeing鈥檚 proposed solutions to those issues.鈥�
Boeing, as well as other industry partners, have been pivotal in driving these necessary changes in characterization of additive materials by sharing models and drawings of what are called 鈥渁lternate tensile coupon designs鈥� to be evaluated by the NIAR round-robin program.
Machine operators, printer manufacturers, material suppliers, testing laboratories, technology adopters, type-certification holders, and certificate regulators could all find the new guide useful.
For more information on the Additive Manufacturing Center of Excellence, please
ASTM welcomes participation in the development of its standards. . The next meeting of the committee on additive manufacturing technologies is September 16-20 in Senlis, France.