Keywords

Polyamide 12 (PA 12), Nylon 12, 3D printing, additive manufacturing, Large Area Projection Sintering, laser sintering, semicrystalline, amorphous

Abstract

Additive Manufacturing provides many advantages in reduced lead times and increased geometric freedom compared to traditional manufacturing methods, but material properties are often reduced. This paper considers powder bed fusion of polyamide 12 (PA12, Nylon 12) produced by three different processes: laser sintering (LS), multijet fusion (MJF)/high speed sintering (HSS), and large area projection sintering (LAPS). While all utilize similar PA12 materials, they are found to differ significantly in mechanical properties especially in elongation to break. The slower heating methods (MJF/HSS and LAPS) produce large elongation at break with the LAPS process showing 10x elongation and MJF/HSS exhibiting 2.5x the elongation when compared to commercial LS samples. While there are small differences in crystallinity between these samples, the difference may be attributed to changes in the heating and cooling rates of the LAPS samples.

Original Publication Citation

Garrett Craft, Justin Nussbaum, Nathan Crane, J.P. Harmon, “Impact of extended sintering times on mechanical properties in PA-12 parts produced by powderbed fusion processes,” Additive Manufacturing, V 22, p 800-806, August 2018.

Document Type

Peer-Reviewed Article

Publication Date

2018-8

Publisher

Additive Manufacturing

Language

English

College

Ira A. Fulton College of Engineering and Technology

Department

Mechanical Engineering

University Standing at Time of Publication

Full Professor

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