Authors:

Jake Kim

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About Paper:

Additive manufacturing (AM) has shown rapid advancement in recent years, emerging as a prominent manufacturing technique due to its versatility, precision, and cost effectiveness. Among the many additive manufacturing methods is powder bed fusion. A bed of fine particles, usually in the micron range, is spread across a platform and each layer is selectively fused using a laser which precisely melts and bonds particles together. The quality of AM builds depend on the uniformity of the spreading process, where uneven spreading can lead to defects in manufactured parts and compromised structural integrity. Spreading depends on boundary-layer rheology, which is affected by the substrate boundary conditions, distributed particle morphology in the spreading layer, and processing parameters such as layer thickness and shear rate. In one aspect, this study uses Discrete Element Modeling simulations to investigate effects of local boundary conditions on spreading rheology. In another aspect, we consider the practical implications of boundary-layer rheology and particle morphology for powder reuse in the laser powder bed fusion process. Keywords: Additive Manufacturing; Morphology; Rheology; Substrate

Source:

Purdue University / 2024

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Co-authors:

Jake Kim