Publications

Results 26–50 of 62
Skip to search filters

CUBIT Geometry and Mesh Generation Toolkit 15.2 User Documentation

Blacker, Ted D.; Owen, Steven J.; Staten, Matthew L.; Quadros, William R.; Hanks, Byron H.; Clark, Brett W.; Meyers, Ray J.; Ernst, Corey E.; Merkley, Karl M.; Morris, Randy M.; McBride, Corey M.; Stimpson, Clinton S.; Plooster, Michael P.; Showman, Sam S.

Welcome to CUBIT, the Sandia National Laboratory automated mesh generation toolkit. CUBIT is a full-featured software toolkit for robust generation of two- and three-dimensional finite element meshes (grids) and geometry preparation. Its main goal is to reduce the time to generate meshes, particularly large hex meshes of complicated, interlocking assemblies. It is a solidmodeler based preprocessor that meshes volumes and surfaces for finite element analysis.

More Details
TYPE Other Report YEAR 2016
OSTIDOI

CUBIT geometry and mesh generation toolkit 15.1 user documentation

Blacker, Ted D.; Owen, Steven J.; Staten, Matthew L.; Quadros, William R.; Hanks, Byron H.; Clark, Brett W.; Meyers, Ray J.; Ernst, Corey E.; Merkley, Karl M.; Morris, Randy M.; McBride, Corey M.; Stimpson, Clinton S.; Plooster, Michael P.; Showman, Sam S.

CUBIT is a full-featured software toolkit for robust generation of two- and three-dimensional finite element meshes (grids) and geometry preparation. Its main goal is to reduce the time to generate meshes, particularly large hex meshes of complicated, interlocking assemblies. It is a solid-modeler based preprocessor that meshes volumes and surfaces for finite element analysis. Mesh generation algorithms include quadrilateral and triangular paving, 2D and 3D mapping, hex sweeping and multi-sweeping, tetrahedral meshing, and various special purpose primitives. CUBIT contains many algorithms for controlling and automating much of the meshing process, such as automatic scheme selection, interval matching, sweep grouping, and also includes state-of-the-art smoothing algorithms.

More Details
TYPE Other Report YEAR 2016
OSTIDOI

Topology Optimization of Cellular Structure

Robbins, Joshua R.; Owen, Steven J.; Clark, Brett W.; Voth, Thomas E.

This paper presents an end-to-end design process for compliance minimization based topological optimization of cellular structures through to the realization of a final printed product. Homogenization is used to derive properties representative of these structures through direct numerical simulation of unit cell models of the underlying periodic structure. The resulting homogenized properties are then used assuming uniform distribution of the cellular structure to compute the final macro-scale structure. A new method is then presented for generating an STL representation of the final optimized part that is suitable for printing on typical industrial machines. Quite fine cellular structures are shown to be possible using this method as compared to other approaches that use nurb based CAD representations of the geometry. Finally, results are presented that illustrate the fine-scale stresses developed in the final macro-scale optimized part and suggestions are made as to incorporate these features into the overall optimization process.

More Details
TYPE Journal Article YEAR 2015
OSTI

Solving the Big Data (BD) Problem in Advanced Manufacturing (Subcategory for work done at Georgia Tech. Study Process and Design Factors for Additive Manufacturing Improvement)

Clark, Brett W.; Diaz, Kimberly D.; Ochiobi, Chinaza O.; Paynabar, Kamran P.

3D printing originally known as additive manufacturing is a process of making 3 dimensional solid objects from a CAD file. This ground breaking technology is widely used for industrial and biomedical purposes such as building objects, tools, body parts and cosmetics. An important benefit of 3D printing is the cost reduction and manufacturing flexibility; complex parts are built at the fraction of the price. However, layer by layer printing of complex shapes adds error due to the surface roughness. Any such error results in poor quality products with inaccurate dimensions. The main purpose of this research is to measure the amount of printing errors for parts with different geometric shapes and to analyze them for finding optimal printing settings to minimize the error. We use a Design of Experiments framework, and focus on studying parts with cone and ellipsoid shapes. We found that the orientation and the shape of geometric shapes have significant effect on the printing error. From our analysis, we also determined the optimal orientation that gives the least printing error.

More Details
TYPE Other Report YEAR 2015
OSTIDOI
Results 26–50 of 62
Results 26–50 of 62