The Influence of Post-SLS-Build Annealing on Nylon 11 Material Properties

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dc.creatorSlattery, Lauren A.
dc.creatorGuckert, Nicole L.
dc.creatorShell, Courtney E.
dc.creatorNeptune, Richard R.
dc.date.accessioned2021-10-06T20:37:38Z
dc.date.available2021-10-06T20:37:38Z
dc.date.issued2012-08-22
dc.description.abstractFunctional energy storage and return prosthetic and orthotic devices have been manufactured out of Nylon 11 using selective laser sintering due to its high ductility and energy return properties. However, there is concern that material voids caused by incomplete sintering may compromise material properties and lead to premature fracture. Post-build annealing has the potential to eliminate voids caused by incomplete sintering and increase part ductility and strength. The purpose of this study was to post-build anneal Nylon 11 tensile specimens at 1) slightly below their melting temperature, 2) their recrystallization temperature, and 3) their glass transition temperature for two different time durations (12 and 24 hours) to assess the effectiveness of annealing in improving ductility and strength. Specimens annealed at their glass transition temperature had significantly greater percent elongations and lower Young’s moduli than specimens annealed close to their melting or recrystallization temperatures. At each temperature, specimens annealed for shorter durations demonstrated a greater increase in percent elongations and a greater decrease in Young’s moduli. Annealing at the glass transition temperature for 12 hours resulted in the highest percent elongation, although it was not significantly different from the control (unannealed) specimens. However, at these annealing conditions Young’s modulus significantly decreased from the control specimens. Across all annealing conditions, Young’s modulus and percent elongation were found to be negatively correlated. Future work should focus on annealing specimens for additional combinations of temperature and duration to further improve ductility while minimizing the negative effects on part strength.en_US
dc.description.departmentMechanical Engineeringen_US
dc.identifier.urihttps://hdl.handle.net/2152/88437
dc.identifier.urihttp://dx.doi.org/10.26153/tsw/15374
dc.language.isoengen_US
dc.publisherUniversity of Texas at Austinen_US
dc.relation.ispartof2012 International Solid Freeform Fabrication Symposiumen_US
dc.rights.restrictionOpenen_US
dc.subjectselective laser sinteringen_US
dc.subjectNylon 11en_US
dc.subjectmaterial voidsen_US
dc.subjectpost-build annealingen_US
dc.subjectfunctional energy storageen_US
dc.subjectprosthetic devicesen_US
dc.titleThe Influence of Post-SLS-Build Annealing on Nylon 11 Material Propertiesen_US
dc.typeConference paperen_US

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2012 International Solid Freeform Fabrication Symposium