Mathematical Simulation of the Stress-Strain State Manifesting During Compression of a Lattice Structure Manufactured by means of Selective Laser Melting

The study considers approaches to mathematical simulation of compression deformation in lattice structure samples featuring a truss-like primitive cell (stellated octahedron, or octet-truss), manufactured by means of selective laser melting of powdered CL20ES steel. We simulated the primitive cells using three-dimensional and beam modelling, employing a number of options for adjusting beam model rigidity by augmenting the cell model with rigid constraints in the corner points, beam elements or uniform rigidity distribution over the model. An adjusted beam model featuring rigid constraints in its corner points, the constraint length being equal to 1/4 of the octahedron face length (0.88 mm) and the effective bar diameter measuring 0.8 mm, made it possible to obtain a highly precise computational strain curve for compression of a lattice structure sample featuring a 5 mm primitive cell edge, the cell bars being approximately 1 mm in diameter

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