Investigations on the Mechanical Response of Gradient Lattice Structures Manufactured via SLM

Metals - Tập 10 Số 2 - Trang 213
Judyta Sienkiewicz1, Paweł Płatek1, Fengchun Jiang2, Xiaojing Sun2, A. Rusinek3,4
1Military University of Technology
2Harbin Engineering University
3Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux
4Universidad Carlos III de Madrid [Madrid]

Tóm tắt

The main aim of the paper is to evaluate the mechanical behavior or lattice specimens subjected to quasi-static and dynamic compression tests. Both regular and three different variants of SS 316L lattice structures with gradually changed topologies (discrete, increase and decrease) have been successfully designed and additively manufactured with the use of the selective laser melting technique. The fabricated structures were subjected to geometrical quality control, microstructure analysis, phase characterization and compression tests under quasi-static and dynamic loading conditions. The mismatch between dimensions in the designed and produced lattices was noticed. It generally results from the adopted technique of the manufacturing process. The microstructure and phase composition were in good agreement with typical ones after the additive manufacturing of stainless steel. Moreover, the relationship between the structure relative density and its energy absorption capacity has been defined. The value of the maximum deformation energy depends on the adopted gradient topology and reaches the highest value for a gradually decreased topology, which also indicates the highest relative density. However, the highest rate of densification was observed for a gradually increasing topology. In addition, the results show that the gradient topology of the lattice structure affects the global deformation under the loading. Both, static and dynamic loading resulted in both barrel- and waisted-shaped deformation for lattices with an increasing and a decreasing gradient, respectively. Lattice specimens with a gradually changed topology indicate specific mechanical properties, which make them attractive in terms of energy absorption applications.

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Metals

Tập 10 Số 2

213

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