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Impact of Raster Angle and Layer Thickness on Irreversible Thermal Strain

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Impact of Raster Angle and Layer Thickness on Irreversible Thermal Strain in Fused Deposition Modeling Parts

 

Additive manufacturing (AM) provides a number of advantages over traditional, subtractive, manufacturing techniques. It has seen widespread adoption among industrial manufacturers, but further adoption is limited by lack of expertise and poor part reliability. We investigated the impact of layer thickness and raster angle on mechanical strength and annealing for parts made with fused deposition modeling (FDM). We observed large, irreversible thermal strains in samples annealed above their glass transition temperature. Observed strains were as high as 22 % and correlated positively with layer thickness. Both tensile and flexural strength of the samples peaked at a 200 μm layer thickness. Tensile and flexural strengths were 29-73 % and 18-41 % of those reported for bulk ABS respectively. Directionality of strain is dependent on raster angle, with strain occurring primarily along roads. These results suggest strain resulting from built-in residual stress is a concern for FDM parts, but such strain may be controlled through appropriate selection of printing parameters. These strains are the result of residual stresses caused by rapid cooling during printing. Existing methods for measuring temperature in situ do not adequately capture this rapid cooling. To address this, we have developed a model to simulate heat transfer in FDM.

 

Author: Anthony D'Amico

 

Conference: SAMPE Seattle 2017

 

SKU/Code: SE17--0851


Pages: 8

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