IMPACT RESISTANCE OF LATTICE STRUCTURE MADE BY SELECTIVE LASER MELTING FROM AlSi12 ALLOY

Abstract

This article describes the impact resistance of lattice structure made by metal additive technology Selective Laser Melting using AlSi12 aluminum powder material. Powder particle distribution was analyzed for verification of distribution and shape of particles. Samples of lattice structure are consisted of three segments. The main part – lattice structure is made from repeated Body Centered Cubic (BCC) unit-cell composed of four thin trusses. The other parts are thin plates on upper and bottom side of the sample. Four series of BCC lattice-structured samples with different diameter of the truss were designed. The samples were tested by the impact testing device with the spherical shape of indenter. During tests the samples were fixed to the base plate using four bolts. The measured data were used for calculation of the absorbed energy using numerical integration in software MATLAB. The results show that the BCC structures with the diameter of the truss d = 0.8 mm have the best combination of stiffness and energy absorption for the parameters of the impact test.

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