Polymer AM Testing for Part Performance (NAIR)
Characterization Methods to Validate Part Correlation of Material Extrusion
Gaps in static property testing is being addressed but there still remain questions and concerns around being able to consistently generate design values for specific application requirements that would be derived from static property testing. Dynamic and application-specific testing still remains a barrier to moving away from datasheets to technology implementation.
Impact (Standardization Gaps)
Successful evaluation and capture of lessons learned from previously completed polymer-AM qualification programs are expected to address gaps dynamic properties such as uniaxial and multi-axial fatigue, creep, and wear. Additionally, the validation and use of static properties when applied more complex geometries will provide confidence that methods in development will allow for part-level predictive capabilities.
NIAR will first review the results of the multiple studies that are currently being worked to compile an approach to microstructure analysis specimens as well as application-specific characterization (tension-tension fatigue, creep, and wear). These results will then be socialized and circulated amongst the ASTM and other AM communities to determine what additional testing should be done prior to standards being created. It is anticipated that additional materials and AM technologies will have to be explored to validate that the approach utilized to characterize an unfilled amorphous polymer processed using ME can be applied more universally. NIAR will conduct additional print, test, analyze cycles to validate the research completed and will work with the F42 and D20 committees to determine which means of standards creation will be appropriate based on the findings.
A standards guidance document will be created to help inform on performing uniaxial and multi-axial fatigue, creep, and wear for Polymer AM Material Extrusion technologies. A guidance document will be provided on toolpath level information for correlating static properties to more complex features commonly found in representative part geometries.