A Dithering Based Method to Generate Variable Volume Lattice Cells for Additive Manufacturing

Date
2011-08-17
Authors
Brackett, D.
Ashcroft, I.
Hague, R.
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Publisher
University of Texas at Austin
Abstract

This paper covers the principles of a novel method to efficiently spatially vary the size of tetrahedral cells of a lattice structure, based upon finite element analysis stress results. A dithering method, specifically error diffusion, is used to represent a grayscale stress fringe with variably spaced black dots. This enables linkage of the spacing between lattice cell vertices to stress level thereby providing a functional variation in cell density. This method is demonstrated with a simple test case in 2D and the steps involved for extension to 3D are described.

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