Abstract
The tensile behavior of an additively manufactured (AM) polymer matrix composite (PMC) is studied with in situ X-ray computed microtomography (CT) and digital volume correlation (DVC). In this experiment, the effects of recycled material content and print direction on the selective laser-sintered (SLS) material’s mechanical response are explored. The PMC samples are printed in a tensile specimen geometry with gage lengths parallel to all three orthogonal, primary sintering directions. In situ tensile-CT experiments are conducted at Argonne National Laboratory’s Advanced Photon Source 2-BM beamline. Analysis of the AM PMC’s tensile response, failure, and strain evolution is analyzed both from a conventional standpoint, using the load–displacement data recorded by the loading fixture, and from a microstructural standpoint by applying DVC analysis to the reconstructed volumes. Significant variations on both strength and ductility are observed from both vantages with respect to print direction and the recycled material content in the printed parts. It is found that the addition of recycled source material with a thermal history reduces the tensile strength of the SLS composite for all directions, but the effect is drastic on the strength in the layering direction.
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Acknowledgements
Los Alamos National Laboratory is operated by Los Alamos National Security LLC under Contract Number DE-AC52-06NA25396 for the US Department of Energy. This research used resources of the Advanced Photon Source, a US Department of Energy (DOE) Office of science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357, Proposal Number 46200. Funding for this research was provided by the Enhanced Surveillance Campaign, Tom Zocco, Program Manager and the Engineering Campaign, Antranik Siranosian, Program Manager.
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Mertens, J.C.E., Henderson, K., Cordes, N.L. et al. Analysis of thermal history effects on mechanical anisotropy of 3D-printed polymer matrix composites via in situ X-ray tomography. J Mater Sci 52, 12185–12206 (2017). https://doi.org/10.1007/s10853-017-1339-4
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DOI: https://doi.org/10.1007/s10853-017-1339-4