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Optimization of FDM Print Path for Anisotropy

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Optimization of FDM Print Path for Anisotropy


Fused Deposition Modeling (FDM) is an additive manufacturing (AM) technique in which filament is heated and extruded layer-by-layer to create a 3-dimensional object. Typically, thermoplastics, such as Acrylonitrile Butadiene Styrene (ABS), are used for FDM parts. Thermoplastics typically have lower strength characteristics as compared to common structural materials. To increase the strength of thermoplastics carbon fibers are often added. The addition of carbon fibers results in parts with a high degree of anisotropy due to the alignment of fibers in the print path direction. Currently there are many professional and open source codes that convert Computer Aided Design (CAD) model information into an extrusion path. The primary goal of traditional print path algorithms is to ensure the final part geometry matches the CAD geometry. Therefore, traditional print path techniques do not necessarily take advantage of the anisotropy inherent in the manufacturing process and can actually lead to decreased performance for a carbon-filled part. This work develops a method to optimize the print path for anisotropy, and demonstrate a test case where local strains near the hole in an open-hole tensile specimen are minimized.


Author: Kaleb G. Niedens, and Nicholas A. Smith


Conference: SAMPE Seattle 2017


SKU/Code: SE17--0569

Pages: 9

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