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Lattice-based unit cell

Mechanical Properties of Test Sphere ( Across Different Length Scales). Plastic collapse (solid). Grain structure. Crystal structure. Plastic buckling (hollow). Lattice-based unit cell. Hollow tube lattice member. Lattice-strut microstructure. Properties of the Strut. Critical Features

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Lattice-based unit cell

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  1. Mechanical Properties of Test Sphere (Across Different Length Scales) Plastic collapse (solid) Grain structure Crystal structure Plastic buckling (hollow) Lattice-based unit cell Hollow tube lattice member Lattice-strut microstructure

  2. Properties of the Strut • Critical Features • Composition • Microstructure • Grain size • Dislocation density/distribution • Geometry/Topology Grain size effect on strength ORNL Sphere (e-beam processed) Dislocation effect on strength

  3. Compressive Response for Different Strut Geometries Loaded Axially a • Mechanical behavior of struts depends on: • Material properties – strength, modulus… • Geometry – solid or tube will change buckling behavior • Tube – wall thickness will control buckling b c d e Pingle S M et al. Proc. R. Soc. A doi:10.1098/rspa.2010.0329

  4. Compressive Response for Different Strut Geometries Loaded at an Incline a • Mechanical behavior of struts load on an incline: • Buckling will depend on load path • Mechanical properties of nodes where struts connect are critical • Tube – wall thickness will control buckling b c d e Pingle S M et al. Proc. R. Soc. A doi:10.1098/rspa.2010.0329

  5. Properties at the Lattice Scale Compressive Strength vs. Density of Lattice Materials Pyramidal hollow lattice truss of single crystal SS Structural efficiency of hollow stainless steel trusses under compression >4X sY=180MPa Lattice materials allow for more efficient structural loading under compression Pingle S M et al. Proc. R. Soc. A doi:10.1098/rspa.2010.0329

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